Gas field chemical adding system capable of calibrating chemical adding amount in situ and method thereof
阅读说明：本技术 一种可就地校准加药量的气田用加药系统及其方法 (Gas field chemical adding system capable of calibrating chemical adding amount in situ and method thereof ) 是由 李晟贤 陈琛 张军生 于 2019-11-26 设计创作，主要内容包括：本发明公开了一种可就地校准加药量的气田用加药系统,包括进泵管、泵、输药管、流量计、标定筒、引压口、三通、出药阀；所述进泵管与泵连接相通；所述泵与输药管连接相通,所述输药管上设置流量计；所述标定筒上部设置引压口,下部通过三通分别与输药管、出药阀连接相通。本发明能够有效解决加药系统的加药流量计量、调整、控制、偏流难题,能够节省加药量；具有实施容易,安全可靠,应用广泛,推广容易等优特点。(The invention discloses a gas field chemical adding system capable of calibrating chemical adding amount in situ, which comprises a pump inlet pipe, a pump, a chemical conveying pipe, a flowmeter, a calibration barrel, a pressure guide port, a tee joint and a chemical outlet valve; the pump inlet pipe is communicated with the pump; the pump is communicated with the medicine conveying pipe, and a flowmeter is arranged on the medicine conveying pipe; the upper part of the calibration cylinder is provided with a pressure guide port, and the lower part of the calibration cylinder is respectively connected and communicated with the medicine conveying pipe and the medicine outlet valve through a tee joint. The invention can effectively solve the problems of dosing flow metering, adjustment, control and bias flow of the dosing system and can save the dosing amount; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.)
1. A gas field chemical adding system capable of calibrating chemical adding amount in situ is characterized in that: comprises a pump inlet pipe, a pump, a medicine conveying pipe, a flowmeter, a calibration cylinder, a pressure guide port, a tee joint and a medicine outlet valve;
the pump inlet pipe is communicated with the pump;
the pump is communicated with the medicine conveying pipe, and a flowmeter is arranged on the medicine conveying pipe;
the upper part of the calibration cylinder is provided with a pressure guide port, and the lower part of the calibration cylinder is respectively connected and communicated with the medicine conveying pipe and the medicine outlet valve through a tee joint.
2. A gas field chemical adding system capable of calibrating chemical adding amount in situ is characterized in that: comprises a pump inlet pipe, a pump, a medicine conveying pipe, a flowmeter, a calibration cylinder, a pressure guide port and a medicine outlet valve;
the pump inlet pipe is communicated with the pump;
the pump is communicated with the medicine conveying pipe, and a flowmeter is arranged on the medicine conveying pipe;
the side surface of the upper part of the calibration cylinder is provided with a pressure guide port, the side surface of the lower part of the calibration cylinder is communicated with the medicine conveying pipe, and the bottom of the calibration cylinder is communicated with the medicine outlet valve.
3. A gas field chemical adding system capable of calibrating chemical adding amount in situ is characterized in that: the system comprises a pump inlet pipe, a pump, a manifold tee joint, a first medicine conveying pipe, a first flowmeter, a first road sign fixed cylinder, a first pressure guiding port, a first tee joint, a first medicine outlet valve, a second medicine conveying pipe, a second flowmeter, a second road sign fixed cylinder, a second pressure guiding port, a second tee joint and a second medicine outlet valve;
the pump inlet pipe is communicated with the pump;
the pump is communicated with 1 interface of the manifold tee, the other 1 interface of the manifold tee is communicated with the first path of medicine conveying pipe, and the 3 rd interface of the manifold tee is communicated with the second path of medicine conveying pipe;
a first path of flowmeter is arranged on the first path of medicine conveying pipe, and a second path of flowmeter is arranged on the second path of medicine conveying pipe;
the upper part of the first path calibration cylinder is provided with a first path pressure guiding opening, and the lower part of the first path calibration cylinder is respectively connected and communicated with a first path medicine conveying pipe and a first path medicine outlet valve through a first path tee joint;
the upper part of the second path calibration cylinder is provided with a second path pressure guiding opening, and the lower part of the second path calibration cylinder is respectively communicated with a second path medicine conveying pipe and a second path medicine discharging valve through a second path tee joint.
4. The gas field dosage system of any of claims 1-3, wherein the system is configured to calibrate dosage in situ, and wherein: the pump is any one of a displacement pump, a metering pump, a plunger pump, a gear pump and a centrifugal pump.
5. The gas field dosage system of any of claims 1-3, wherein the system is configured to calibrate dosage in situ, and wherein: and a safety valve, a pressure gauge or a pressure transmitter, an emptying valve, a drain valve and a backflow regulating valve are arranged on the pump or the medicine conveying pipe.
6. The gas field dosage system of any of claims 1-3, wherein the system is configured to calibrate dosage in situ, and wherein: and a pressure guide switch valve is arranged on the pressure guide port.
7. A gas field chemical adding system capable of calibrating chemical adding amount in situ is characterized in that: comprises a drip tank, a bracket, a flowmeter, a drug delivery pipe, a converging pipe, a regulating valve, a main switch valve, a drug tee joint, a calibration switch valve, a calibration cylinder pressure guiding pipe, a pressure guiding tee joint, a pressure guiding valve and a drip tank pressure guiding pipe;
a bracket is arranged at the lower part or the bottom of the drip tank;
the bottom of the drip irrigation tank is communicated with the medicine conveying pipe;
the medicine conveying pipe is provided with a flowmeter and a main switch valve;
one end of the drug delivery pipe is communicated with the side interface of the drug tee joint, and the other end of the drug delivery pipe is communicated with the bottom or the lower part of the drip tank;
the lower port of the medicament tee is communicated with the regulating valve, the upper port of the medicament tee is communicated with the calibration switch valve, and the side port of the medicament tee is communicated with the medicament conveying pipe;
the upper part of the calibration switch valve is communicated with the calibration cylinder, and the lower part of the calibration switch valve is communicated with the medicament tee;
the upper part of the calibration cylinder is communicated with a pressure guiding pipe of the calibration cylinder, and the lower part of the calibration cylinder is communicated with a calibration switch valve;
one end of the pressure guiding pipe of the calibration cylinder is communicated with the upper part of the calibration cylinder, and the other end of the pressure guiding pipe of the calibration cylinder is communicated with the upper part interface of the pressure guiding tee;
the side interface of the pressure guide tee is communicated with a pressure guide pipe of the drip tank, the lower part of the pressure guide tee is communicated with a pressure guide valve, and the upper part of the pressure guide tee is communicated with a pressure guide pipe of the calibration cylinder;
one end of the pressure guiding pipe of the drip tank is communicated with the upper part or the top of the drip tank, and the other end of the pressure guiding pipe of the drip tank is communicated with the side interface of the pressure guiding tee;
the lower part of the pressure guide valve is communicated with the upper part or the top part of the junction pipe, and the upper part of the pressure guide valve is communicated with the lower part of the pressure guide tee;
the lower part of the regulating valve is communicated with the upper part or the top part of the junction pipe, and the upper part is communicated with the lower port of the medicament tee joint;
the elevation of the top of the calibration cylinder is equal to or higher than the elevation of the top of the drip tank;
the elevation of the bottom of the calibration cylinder is equal to or lower than the elevation of the bottom of the drip irrigation tank.
8. The system of claim 7, wherein the system further comprises: an auxiliary switch valve is arranged between the regulating valve and the medicament tee; the upper end of the auxiliary switch valve is communicated with the lower port of the medicament tee joint, and the lower end of the auxiliary switch valve is communicated with the regulating valve.
9. A gas field chemical adding system capable of calibrating chemical adding amount in situ is characterized in that: comprises a drip tank, a bracket, a medicine conveying pipe, a converging pipe, a regulating valve, a flowmeter, a main switch valve, a medicament tee joint, a calibration cylinder pressure guiding pipe, a pressure guiding tee joint, a pressure guiding valve and a drip tank pressure guiding pipe;
a bracket is arranged at the lower part or the bottom of the drip tank;
the bottom of the drip irrigation tank is communicated with the medicine conveying pipe;
a main switch valve is arranged on the medicine conveying pipe;
one end of the drug delivery pipe is communicated with the side interface of the drug tee joint, and the other end of the drug delivery pipe is communicated with the bottom or the lower part of the drip tank;
the lower interface of the medicament tee is communicated with the flowmeter, the upper interface is communicated with the lower part or the bottom interface of the calibration cylinder, and the side interface is communicated with the medicament conveying pipe;
the upper part or the top interface of the calibration cylinder is communicated with a pressure guiding pipe of the calibration cylinder, and the lower part is communicated with an upper interface of the medicament tee;
one end of the pressure guiding pipe of the calibration cylinder is communicated with the upper part or the top interface of the calibration cylinder, and the other end of the pressure guiding pipe of the calibration cylinder is communicated with the upper interface of the pressure guiding tee;
the side interface of the pressure guide tee is communicated with a pressure guide pipe of the drip tank, the lower part of the pressure guide tee is communicated with a pressure guide valve, and the upper part of the pressure guide tee is communicated with a pressure guide pipe of the calibration cylinder;
one end of the pressure guiding pipe of the drip tank is communicated with the upper part or the top of the drip tank, and the other end of the pressure guiding pipe of the drip tank is communicated with the side interface of the pressure guiding tee;
the lower part of the pressure guide valve is communicated with the upper part or the top part of the junction pipe, and the upper part of the pressure guide valve is communicated with the lower part of the pressure guide tee;
the lower interface of the flowmeter is communicated with the pressure regulating valve, and the upper part of the flowmeter is communicated with the lower interface of the medicament tee;
the lower part of the pressure regulating valve is communicated with the upper part or the top of the junction pipe, and the upper part of the pressure regulating valve is communicated with the lower interface of the flowmeter;
the elevation of the top of the calibration cylinder is equal to or higher than the elevation of the top of the drip tank;
the elevation of the bottom of the calibration cylinder is equal to or lower than the elevation of the bottom of the drip irrigation tank.
10. The system of claim 9, wherein the system further comprises: a calibration switch valve is arranged between the calibration cylinder and the medicament tee; the upper end of the calibration switch valve is communicated with a lower connector of the calibration cylinder, and the lower end of the calibration switch valve is communicated with an upper connector of the medicament tee.
11. The gas field dosage system capable of in situ calibration of dosage according to any of claims 7 and 9, wherein: the elevation of the top of the calibration cylinder is lower than the elevation of the top of the drip tank; the bottom elevation of the calibration cylinder is higher than the elevation of the bottom of the drip irrigation cylinder.
12. The gas field dosage system capable of in situ calibration of dosage according to any of claims 7 and 9, wherein: the drip tank is provided with a liquid level meter, a safety valve, a pressure meter or a pressure transmitter, an emptying valve and a blow-down valve.
13. The gas field dosage system capable of in situ calibration of dosage according to any of claims 7 and 9, wherein: and a medicine replenishing valve is arranged on the drip tank.
14. The gas field dosage system capable of in situ calibration of dosage according to any of claims 7 and 9, wherein: an auxiliary pressure-leading valve is arranged on the pressure-leading pipe of the calibration cylinder.
15. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the flowmeter is any one of a gear flowmeter, a rotor flowmeter, an ultrasonic flowmeter, an external clamp type ultrasonic flowmeter, a portable ultrasonic flowmeter, an electromagnetic flowmeter, a float flowmeter, a water meter, an amoebic flowmeter, a bent pipe flowmeter, a balance flowmeter, a wedge flowmeter, a target flowmeter, a vortex flowmeter, a turbine flowmeter, a pore plate flowmeter, a vortex flowmeter and a differential pressure flowmeter.
16. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the calibration cylinder is any one of a magnetic turning plate liquid level meter, a magnetic floater type liquid level meter, a magnetic sensitive electronic double-color liquid level meter, a glass tube liquid level meter, a glass plate type liquid level meter, a color quartz tube type liquid level meter, a sight glass type liquid level meter and an ultrasonic liquid level meter.
17. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the calibration cylinder is a remote transmission type magnetic floater type liquid level meter which is manufactured by utilizing a buoyancy principle, a magnetic coupling effect, a sensor, a transmitter and a display instrument.
18. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the calibration cylinder comprises a shell with a flange, a magnetic floating ball liquid level transmitter with a flange, an upper interface and a bottom interface; the lower end of the magnetic floating ball liquid level transmitter extends to the lower part in the shell, and the upper end of the magnetic floating ball liquid level transmitter is connected with a flange at the top of the shell.
19. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the calibration cylinder comprises a threaded shell, a threaded static pressure type liquid level transmitter, an upper interface and a bottom interface, the lower end of the static pressure type liquid level transmitter extends to the lower portion in the shell, and the upper portion of the static pressure type liquid level transmitter is in threaded connection with the top of the shell.
20. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the calibration cylinder comprises a shell, a pressure transmitter, an upper interface and a bottom interface, wherein the pressure transmitter is arranged on the lower portion of the shell.
21. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the calibration cylinder comprises a shell, a pressure gauge, a top connector and a bottom connector, wherein the pressure gauge is arranged on the lower portion of the shell.
22. The gas field dosage system of any of claims 1-3, 7, and 9, wherein the system further comprises: the calibration cylinder comprises a shell, a magnetic float, a top interface, colored iron powder and a bottom interface, wherein the magnetic float is arranged in the shell, and the colored iron powder is arranged outside the shell and at a position corresponding to the magnetic float.
23. An in situ calibrated dosing flow metering and regulation control method for a gas field dosing system according to claims 1-3, comprising the steps of:
1) connecting line balance pressure:
on the top of the natural gas pipeline, a medicine outlet valve is vertically connected and communicated with the top of the natural gas pipeline by a medicine outlet pipeline, and a pressure guide port and the natural gas pipeline are connected and communicated by a pressure guide pipeline, so that the pressure in a calibration cylinder is automatically balanced with the pressure in the natural gas pipeline and the medicine outlet valve;
2) adding medicine:
opening the medicine outlet valve, starting the pump, and allowing the medicine to sequentially pass through the pump inlet pipe, the pump, the medicine conveying pipe, the flow meter, the tee joint, the medicine outlet valve and the medicine outlet pipeline under the action of gravity to enter the natural gas pipeline;
3) metering by a flowmeter:
the flow state that the medicament sequentially passes through the pump inlet pipe, the pump, the medicament conveying pipe, the flowmeter, the tee joint, the medicament outlet valve and the medicament outlet pipeline to enter the natural gas pipeline is kept under the action of gravity; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the natural gas pipeline;
4) calibrating flow meter metering error
Closing the medicine outlet valve to enable the medicine to enter the calibration barrel upwards, reading the liquid level increase value of the calibration barrel in unit time, and calculating the volume of the medicine entering the calibration barrel in unit time to obtain the medicine flow rate of the medicine entering the calibration barrel; then according to a formula of (the flow rate of the medicament entering the calibration cylinder-the average dosing flow rate entering the natural gas pipeline) ÷ the flow rate of the medicament entering the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the flowmeter;
5) calibrating and correcting medicine adding flow
Opening a medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a medicine conveying pipe, a flowmeter, a tee joint and a medicine outlet valve under the action of gravity and enter a natural gas pipeline; calibrating and measuring errors according to the flowmeter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the flowmeter which are read and recorded again;
6) adjusting the medicine adding flow to the required medicine adding amount
Calibrating a metering error according to the flowmeter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and accumulated flow of the flowmeter; and then, gradually adjusting the discharge capacity of the pump to the required dosing flow according to the corrected instantaneous flow and accumulated flow reading of the flowmeter.
24. The in-situ calibrated dosing flow metering and regulation control method of a dosing system for gas fields according to claims 1-2, comprising the steps of: 1) connecting line balance pressure:
the medicine outlet valve is vertically connected and communicated with the sleeve joint by a medicine outlet pipeline, and then the pressure leading port is connected and communicated with the sleeve joint by a pressure leading pipeline, so that the pressure in the calibration cylinder is automatically balanced with the pressure in the gas well sleeve; 2) adding medicine:
opening a medicine outlet valve, starting a pump, and allowing the medicine to sequentially pass through a pump inlet pipe, the pump, a medicine conveying pipe, a flow meter, a tee joint, a medicine outlet valve, a medicine outlet pipeline, a casing joint and a gas well casing valve under the action of gravity to enter a gas well casing;
3) metering by a flowmeter:
keeping the flow state of the medicament entering the gas well casing pipe through the pump inlet pipe, the pump, the medicament conveying pipe, the flow meter, the tee joint, the medicament outlet valve, the medicament outlet pipeline, the casing joint and the gas well casing valve in sequence unchanged; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the gas well casing;
4) calibrating flow meter metering error
Closing the medicine outlet valve to enable the medicine to enter the calibration barrel upwards, reading the liquid level increase value of the calibration barrel in unit time, and calculating the volume of the medicine entering the calibration barrel in unit time to obtain the medicine flow rate of the medicine entering the calibration barrel; then according to a formula of (the flow rate of the medicament entering a calibration cylinder-the average dosing flow rate entering a gas well casing) divided by the flow rate of the medicament entering the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the flowmeter;
5) calibrating and correcting medicine adding flow
Opening a medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a medicine conveying pipe, a flow meter, a tee joint, a medicine outlet valve, a medicine outlet pipeline, a casing joint and a gas well casing valve and enter a gas well casing; calibrating and measuring errors according to the flowmeter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the flowmeter which are read and recorded again;
6) adjusting the medicine adding flow to the required medicine adding amount
Calibrating a metering error according to the flowmeter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and accumulated flow of the flowmeter; and then gradually adjusting the discharge capacity of the pump to the required dosing flow according to the corrected instantaneous flow and accumulated flow reading of the flowmeter.
25. The in-situ calibrated dosing flow metering and regulation control method of a gas field dosing system according to claim 3, comprising the steps of:
1) connecting line balance pressure:
on the top of the first path of natural gas pipeline, a first path of medicine outlet pipeline is used for vertically connecting and communicating a first path of medicine outlet valve with the top of the first path of natural gas pipeline, and a first path of pressure guide pipeline is used for connecting and communicating a first path of pressure guide port and the first path of natural gas pipeline, so that the pressure in the first road marking fixed cylinder is automatically balanced with the pressure in the first path of natural gas pipeline and the first path of medicine outlet valve;
on the top of the second natural gas pipeline, a second medicine outlet pipeline is used for vertically connecting and communicating a second medicine outlet valve with the top of the second natural gas pipeline, and a second pressure guide pipeline is used for connecting and communicating a second pressure guide port and the second natural gas pipeline, so that the pressure in the second road marking fixed cylinder is automatically balanced with the pressure in the second natural gas pipeline and the second medicine outlet valve;
2) adding medicine:
opening a first path of medicine outlet valve, starting a pump, and enabling the medicine to sequentially pass through a pump inlet pipe, the pump, a manifold tee joint, a first path of medicine conveying pipe, a first path of flowmeter, a first path tee joint, a first path of medicine outlet valve and a first path of medicine outlet pipeline under the action of gravity to enter a first path of natural gas pipeline;
opening the second medicine outlet valve, and allowing the medicine to sequentially pass through the pump inlet pipe, the pump, the manifold tee joint, the second medicine conveying pipe, the second flowmeter, the second tee joint, the second medicine outlet valve and the second medicine outlet pipeline under the action of gravity to enter the natural gas pipeline;
3) metering by a flowmeter:
keeping the medicament to sequentially pass through a pump inlet pipe, a pump, a manifold tee joint, a first path of medicament conveying pipe, a first path of flow meter, a first path of tee joint, a first path of medicament outlet valve and a first path of medicament outlet pipeline under the action of gravity to enter a first path of natural gas pipeline;
keeping the medicament to sequentially pass through a pump inlet pipe, a pump, a manifold tee joint, a second path of medicament conveying pipe, a second path of flow meter, a second path of tee joint, a second path of medicament outlet valve and a second path of medicament outlet pipeline under the action of gravity to enter a natural gas pipeline;
4) calibrating flow meter metering error
Closing the first medicine outlet valve to enable the medicine to enter the calibration cylinder upwards, reading the liquid level increase value of the calibration cylinder in unit time, and calculating the volume of the medicine entering the calibration cylinder in unit time to obtain the medicine flow rate of the medicine entering the calibration cylinder; then according to a formula of (the flow of the medicament entering the calibration cylinder-the average dosing flow entering the natural gas pipeline) ÷ the flow of the medicament entering the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the first path of flow meter;
closing the second medicine outlet valve to enable the medicine to enter the calibration cylinder upwards, reading the liquid level increase value of the calibration cylinder in unit time, and calculating the volume of the medicine entering the calibration cylinder in unit time to obtain the medicine flow rate of the medicine entering the calibration cylinder; then according to a formula of the calibration metering error of the flowmeter, dividing the flow of the medicament entering the calibration cylinder by the average medicament adding flow entering the natural gas pipeline by the flow of the medicament entering the calibration cylinder by 100 percent, and obtaining the calibration metering error of the second path of flowmeter;
5) calibrating and correcting medicine adding flow
Opening a first path of medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a manifold tee joint, a first path of medicine conveying pipe, a first path of flow meter, a first path tee joint, a first path of medicine outlet valve and a first path of medicine outlet pipeline to enter a first path of natural gas pipeline under the action of gravity; calibrating the metering error according to the first path of flow meter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the first path of flow meter which are read and recorded again;
opening a second medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a manifold tee joint, a second medicine conveying pipe, a second flowmeter, a second tee joint, a second medicine outlet valve and a second medicine outlet pipeline under the action of gravity to enter a natural gas pipeline; calibrating the metering error according to the second path of flow meter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the second path of flow meter which are read and recorded again;
6) adjusting the medicine adding flow to the required medicine adding amount
Calibrating a metering error according to the first path of flow meter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and accumulated flow of the first path of flow meter;
calibrating a metering error according to the second-path flowmeter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and accumulated flow of the second-path flowmeter;
and then, gradually adjusting the discharge capacity of the pump to the required dosing flow according to the corrected instantaneous flow and accumulated flow readings of the first path of flow meter and the second path of flow meter.
26. The in-situ calibrated dosing flow metering and regulation control method of a gas field dosing system according to claim 7, comprising the steps of:
1) connecting wires and erecting:
horizontally connecting and communicating the junction pipe with a gas well casing valve, and enabling the central line of the junction pipe and the central line of the gas well casing valve to be positioned on the same horizontal line, or enabling the central line of the junction pipe to be higher than the central line of the gas well casing valve;
the bottom of the drip tank is higher than the central line of a gas well casing pipe valve and a gas well casing pipe by the conventional method;
2) equilibrium pressure
Opening a gas well casing valve, a pressure-leading valve, a calibration switch valve and a main switch valve to enable natural gas in a gas well casing to enter a calibration cylinder and a drip tank, further enabling the pressure in the calibration cylinder, the drip tank and the gas well casing to be balanced, and enabling liquid levels in the calibration cylinder and the drip tank to be balanced;
3) adding medicine:
opening the regulating valve, and allowing the medicament in the drip tank to automatically flow into the gas well casing through the flow meter, the medicament conveying pipe, the main switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity;
4) metering by a flowmeter:
the flow state of the medicament in the drip tank flowing into the gas well casing through the flow meter, the medicament conveying pipe, the main switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence is kept; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the gas well casing;
5) calibrating flow meter metering error
Keeping the opening degrees of the regulating valve and the calibration switch valve unchanged, closing the main switch valve, and enabling the medicament in the calibration cylinder to automatically flow into the gas well casing through the calibration switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity; reading a liquid level reduction value of the calibration cylinder in unit time, and calculating the volume of the medicament flowing out of the calibration cylinder in unit time to obtain the medicament flow rate of the medicament flowing out of the calibration cylinder; then according to a formula of (the flow of the agent flowing out of the calibration cylinder-the average medicine adding flow entering the gas well casing tube) ÷ the flow of the agent flowing out of the calibration cylinder multiplied by 100%, obtaining the calibration metering error of the flowmeter;
6) calibrating and correcting medicine adding flow
Calibrating the metering error by using the flowmeter obtained in the step 5), and calibrating and correcting the average dosing flow of the medicament obtained in the step 4) entering the gas well casing;
7) adjusting the medicine adding flow to the required medicine adding amount
Opening the main switch valve, the medicament in the drip tank automatically flows into the gas well casing through the flow meter, the medicament conveying pipe, the main switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity, and simultaneously, part of the medicament automatically flows into the calibration cylinder to restore the balance between the liquid level of the calibration cylinder and the liquid level in the drip tank;
adjusting the opening of the adjusting valve, and repeating the steps 4) and 6) to adjust the dosing flow to the required flow.
27. The gas well dosing system in-situ calibration dosing flow metering and regulation control method as claimed in claim 26, wherein: also comprises the following steps: and after the metering error of the flowmeter is calibrated, closing the auxiliary pressure-leading valve and the calibration switch valve, dismantling the calibration cylinder, and reusing the calibration cylinder for calibrating the metering error of the flowmeter of other gas wells.
28. The gas well dosing system in-situ calibration dosing flow metering and regulation control method as claimed in claim 9, comprising the steps of:
1) connecting wires and erecting:
horizontally connecting and communicating the junction pipe with a gas well casing valve, and enabling the central line of the junction pipe and the central line of the gas well casing valve to be positioned on the same horizontal line, or enabling the central line of the junction pipe to be higher than the central line of the gas well casing valve;
the bottom of the drip tank is higher than the central line of a gas well casing pipe valve and a gas well casing pipe by the conventional method;
2) equilibrium pressure
Opening a gas well casing valve, a pressure-leading valve and a main switch valve to enable natural gas in a gas well casing to enter a calibration cylinder and a drip tank, further enabling the pressure in the calibration cylinder, the drip tank and the gas well casing to be balanced, and enabling the liquid levels in the calibration cylinder and the drip tank to be balanced;
3) adding medicine:
opening the regulating valve, and allowing the medicament in the drip tank to automatically flow into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity;
4) metering by a flowmeter:
the flow state of the medicament in the drip tank flowing into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence is kept; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the gas well casing;
5) calibrating flow meter metering error
Keeping the opening of the regulating valve unchanged, closing the main switch valve, and enabling the medicament in the calibration cylinder to automatically flow into the gas well casing through the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity; reading the liquid level reduction value of the calibration cylinder in unit time, and calculating the volume of the medicament flowing out of the calibration cylinder in unit time to obtain the medicament flow rate of the medicament flowing out of the calibration cylinder; then according to a formula of (the flow of the agent flowing out of the calibration cylinder-the average medicine adding flow entering the gas well casing tube) ÷ the flow of the agent flowing out of the calibration cylinder multiplied by 100%, obtaining the calibration metering error of the flowmeter;
6) calibrating and correcting medicine adding flow
Calibrating the metering error by using the flowmeter obtained in the step 5), and calibrating and correcting the average dosing flow of the medicament obtained in the step 4) entering the gas well casing;
7) adjusting the medicine adding flow to the required medicine adding amount
Opening the main switch valve, the medicament in the drip tank automatically flows into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity, and simultaneously, part of the medicament automatically flows into the calibration cylinder to restore the balance between the liquid level of the calibration cylinder and the liquid level in the drip tank;
adjusting the opening of the adjusting valve, and repeating the steps 4) and 6) to adjust the dosing flow to the required flow.
29. The gas well dosing system in-situ calibration dosing flow metering and regulation control method as claimed in claim 9, comprising the steps of:
1) connecting wires and erecting:
horizontally connecting and communicating a junction pipe with one closed end with a gas well casing valve, and enabling the central line of the junction pipe and the central line of the gas well casing valve to be positioned on the same horizontal line or enabling the central line of the junction pipe to be higher than the central line of the gas well casing valve;
the bottom of the drip tank is higher than the central line of a gas well casing pipe valve and a gas well casing pipe by the conventional method;
2) equilibrium pressure
Opening a gas well casing valve, a pressure-leading valve and a main switch valve to enable natural gas in a gas well casing to enter a calibration cylinder and a drip tank, further enabling the pressure in the calibration cylinder, the drip tank and the gas well casing to be balanced, and enabling the liquid levels in the calibration cylinder and the drip tank to be balanced;
3) adding medicine:
opening the regulating valve, and allowing the medicament in the drip tank to automatically flow into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity;
4) calibrating flow meter metering error
Closing the main switch valve, and allowing the medicament in the calibration cylinder to automatically flow into the gas well casing through the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity; reading the liquid level reduction value of the calibration cylinder in unit time, and calculating the volume of the medicament flowing out of the calibration cylinder in unit time to obtain the medicament flow rate of the medicament flowing out of the calibration cylinder;
meanwhile, reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average flow value of the flowmeter;
then according to a formula of (the flow of the medicament flowing out of the calibration cylinder-the average flow value of the flowmeter) ÷ the flow of the medicament flowing out of the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the flowmeter;
5) calibrating and correcting medicine adding flow
Calibrating a metering error by using the flowmeter obtained in the step 4), and calibrating and correcting the average flow value of the flowmeter obtained in the step 4);
6) adjusting the medicine adding flow to the required medicine adding amount
Opening the main switch valve, the medicament in the drip tank automatically flows into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity, and simultaneously, part of the medicament automatically flows into the calibration cylinder to restore the balance between the liquid level of the calibration cylinder and the liquid level in the drip tank;
adjusting the opening of the adjusting valve, and repeating the steps 4) and 5) to adjust the dosing flow to the required flow.
30. The gas well dosing system in-situ calibration dosing flow metering and regulation control method as claimed in claims 28-29, wherein: also comprises the following steps: and after the metering error of the flowmeter is calibrated, closing the auxiliary pressure-leading valve and the calibration switch valve, dismantling the calibration cylinder, and reusing the calibration cylinder for calibrating the metering error of the flowmeter of other gas wells.
31. The gas field dosage system of any of claims 1-22, wherein: it is used for dosing oil well casing.
32. The in situ calibrated dosing flow metering and regulation control method of any one of the dosing systems of claims 23-30, wherein: it is used for dosing oil well casing.
Technical Field
The invention relates to the field of dosing of natural gas pipelines and gas wells, in particular to a dosing system for a gas field and a dosing method thereof, wherein the dosing system can calibrate dosing amount in situ. The method can be applied to gas wells and natural gas pipelines needing to be added with medicaments.
Background
In order to ensure the normal production and operation of natural gas channels (collectively referred to as natural gas flow channels) of gas wells, natural gas pipelines, pipe fittings and instruments and the like, functional chemical agents (also referred to as chemical agents) which are in liquid state at normal temperature and normal pressure are generally required to be added into the natural gas flow channels, collectively referred to as dosing.
When adding medicine, generally, the medicine adding amount (i.e. the medicine adding amount) or the medicine adding flow (i.e. the medicine adding flow) of the medicine needs to be controlled, adjusted and measured.
At present, the dosage or the dosage flow of the medicament is mainly controlled, adjusted and metered by using a metering pump in China, and the method has the following defects:
1. the method can not accurately control, adjust and measure the dosing flow, and only can roughly control, adjust and measure the dosing flow.
As is known in the art: the metering pump controls the stroke length of a plunger by utilizing a cam mechanism so as to control the percentage of rated displacement (or theoretical displacement) of the metering pump, thereby achieving the purpose of controlling the displacement of the metering pump; if the rated displacement of the metering pump is 60 liters/hour, the displacement of the metering pump can be adjusted to 50 percent of the rated displacement by controlling the plunger stroke of the metering pump to be 50 percent of the maximum stroke by utilizing the cam mechanism, so that the displacement of the metering pump is adjusted to 30 liters/hour; because the metering pump does not have a flowmeter, the plunger of the metering pump has leakage, and the leakage is larger and larger along with the continuous abrasion of the sealing function of the plunger and the continuous abrasion of the liquid discharge valve and the liquid inlet valve, so that the dosing flow cannot be accurately controlled, adjusted and metered by the metering pump.
2. The method can not effectively control, adjust and measure the dosing flow of the 1-pump multi-tube dosing system, can not solve the problem of the dosing flow bias of the 1-pump multi-tube dosing system, and can not meet the dosing flow control, adjustment and measurement requirements of the dosing systems.
Take Qinghai gas field as an example.
The gas field is applied with a high-pressure gas lift production process, 2-50 high-pressure natural gas injection pipelines are generally arranged on 1 gas distribution valve bank, and 10MPa high-pressure natural gas is respectively distributed into 2-50 gas well casings for gas lift production.
Taking 1 gas distribution valve group with 3 high-pressure natural gas injection pipelines arranged in the gas field as an example, as shown in fig. 1, the process can be briefly described as follows: the gas distribution valve group is provided with a
At present, the liquid flow is generally measured by using a flow meter measuring method in China, for example, a gear flow meter is used for measuring instantaneous water flow and accumulated water flow in a water pipe; the method is used for the dosing amount or dosing flow metering of the medicament, and has the following defects:
1. the gear flowmeter has leakage; when the dosing flow is small and the viscosity of the medicament is low, the metering error caused by leakage amount can reach 57 percent, which is hundreds of times of the factory calibration metering error of the gear flowmeter, so that the dosing flow is difficult to be effectively metered, and the actual production requirement cannot be met.
As is known in the art: the viscosity difference of different medicaments is great, for example, the viscosity of ethylene glycol used as a natural gas hydrate inhibitor is several times that of clear water, the viscosity of polyacrylamide aqueous solution and polyvinylpyrrolidone aqueous solution used as the natural gas hydrate inhibitor is several hundred times that of the clear water, but the viscosity of methanol used as the natural gas hydrate inhibitor is lower than that of the clear water; the lower the viscosity of the medicament, the larger the leakage of the gear flowmeter, and the larger the metering error.
As is known in the art: the gear flowmeter is generally calibrated for the metering error by using the calibration device and the clean water shown in fig. 2 when being shipped.
The test shows that: the calibration device and methanol shown in fig. 2 are used for a gear flowmeter calibration test, and the results show that: when the reading of a pressure gauge 202 (with the accuracy of 1.6 grade) is 0.03MPa, the
As is known in the art: the national standard requires that the maximum error of the industrial instrument is 4%, and when the existing industrial flowmeter leaves a factory or is calibrated in an authoritative metering mechanism, the maximum allowable value of the metering error is +/-4%; the user uses the industrial flow meter, and the maximum allowable value of the indoor calibrated metering error is plus or minus 4 percent; the dosing flow of the gas field is generally very small, taking a gas distribution valve group with 3 gas injection pipelines in the Qinghai gas field as an example, the total methanol injection amount of the 3 gas injection pipelines is 30-60 liters/day (or 1.25-2.5 liters/hour), and the average methanol injection amount of a single gas injection pipeline is only 10-20 liters/day (or 0.4-0.8 liters/hour); therefore, when the error of the flow meter reaches 57%, the real and effective dosing amount (or dosing flow) cannot be obtained according to the flow meter, and the production requirement of the gas field cannot be met.
2. The leakage of the gear flowmeter belongs to mechanical clearance leakage, and the leakage quantity of the gear flowmeter is necessarily changed along with the change of the pressure difference before and after the flowmeter; due to the complexity, the fluctuation and the contingency of the fluid in the actual production working condition, the front and back pressure difference of the gear flowmeter in the actual production application is different and changes randomly at any time, so the actual leakage quantity is also different and changes randomly at any time; therefore, the metering error of the gear flowmeter calibrated before delivery or under other indoor conditions is greatly different from the metering error of the gear flowmeter in actual production application, so that the dosing flow is difficult to accurately meter, and the actual production requirement cannot be met.
The general knowledge in the field and the fluid mechanics are that: when the geometrical size of the gap is constant, the flow rate of the fluid passing through the gap is changed along with the change of the pressure difference between the front and the back of the gap; the flow resistance of the fluid passing through the small hole with the aperture of 1mm and the large hole with the aperture of 10mm is different; when a fluid passes through a small hole with a diameter of 1mm and a large hole with a diameter of 10mm at the same time, if the flow rate of the fluid passing through the large hole with a diameter of 10mm is changed, the flow rate passing through the small hole with a diameter of 1mm is necessarily changed; therefore, even if the pressure difference between the front and the rear of the gear flowmeter is constant, the leakage of the gear flowmeter is different when the instantaneous flow is 10 liters/hour and 1 liter/hour; that is, even if the differential pressure across the same gear flowmeter is constant, the gear flowmeter will have different leakage amounts when measuring different instantaneous flow rates.
In a word, the method for controlling, adjusting and metering the dosing amount (or dosing flow) cannot effectively meter the dosing amount and the dosing flow when dosing is carried out aiming at small flow.
Disclosure of Invention
The "agent" in the present invention: also called functional chemical agent, sometimes called medicine for short, is liquid at normal temperature and pressure.
The invention comprises the following steps: is a general term for adding functional chemical agents. Sometimes it refers to the process of adding liquid chemical agent into oil-gas well and pipeline.
The dosage in the invention is as follows: refers to the volume or weight of functional chemical added, and sometimes to the dosing flow rate.
The 'dosing flow rate' in the invention: sometimes, the dosage is abbreviated, which is the abbreviation of the adding flow of the functional chemical agent, and generally refers to the volume flow of the functional chemical agent.
The first technical problem to be solved by the invention is to provide a dosing system which can calibrate the dosing amount in situ; the dosing system overcomes the defects of the existing dosing system (or device), can calibrate the dosing flow (or dosing quantity) on site in the production field, can effectively solve the problems of dosing flow metering, adjustment, control and bias flow of the existing dosing system, can save the dosing quantity, and can meet the dosing requirement required by production; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.
The second technical problem to be solved by the invention is to provide a method for the dosing system to calibrate dosing flow metering and adjusting control in situ; the method overcomes the defects of dosing flow metering, adjusting and controlling of the existing dosing system (or device), can effectively solve the problems of dosing metering, adjusting, controlling and bias flow existing in the dosing system, can save dosing amount, and can meet the dosing requirement required by production; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.
In order to solve the first technical problem, a first technical solution adopted by the present invention is:
a gas field chemical adding system capable of calibrating chemical adding amount in situ comprises a pump inlet pipe, a pump, a chemical conveying pipe, a flow meter, a calibration cylinder, a pressure guiding opening, a tee joint and a chemical outlet valve;
the pump inlet pipe is communicated with the pump;
the pump is communicated with the medicine conveying pipe, and a flowmeter is arranged on the medicine conveying pipe;
the upper part of the calibration cylinder is provided with a pressure guide port, and the lower part of the calibration cylinder is respectively connected and communicated with the medicine conveying pipe and the medicine outlet valve through a tee joint.
The calibration cylinder can meet the production requirement of on-site rapid observation (including but not limited to visual observation) or metering the volume of the medicament entering the calibration cylinder under the pressure condition, and can meet the production requirement of calibrating and calibrating the flowmeter; the specific form shape, pressure rating, inner diameter, outer diameter and mounting manner of the calibration cylinder can be determined by those skilled in the art according to the means in the prior art.
Preferably, for the convenience of dosing, the pump is any one of a displacement pump, a metering pump, a plunger pump, a gear pump and a centrifugal pump.
As is known in the art: the plunger pump, the gear pump and the centrifugal pump can adjust and control the discharge capacity of the pump in a frequency conversion speed regulation mode, so that the plunger pump, the gear pump and the centrifugal pump can be used for adjusting and controlling the dosage.
Preferably, for convenient installation without firing, the drug delivery tube is a high pressure hose reinforced with steel wire or other high strength fibers.
Preferably, for convenience of metering, the flowmeter is any one of a gear flowmeter, a rotor flowmeter, an ultrasonic flowmeter, a clip-on ultrasonic flowmeter, a portable ultrasonic flowmeter, an electromagnetic flowmeter, a float flowmeter, a water meter, an amoebic flowmeter, a bent pipe flowmeter, a balance flowmeter, a wedge flowmeter, a target flowmeter, a vortex street flowmeter, a turbine flowmeter, an orifice plate flowmeter, a vortex flowmeter and a differential pressure flowmeter.
Preferably, for convenience or fast calibration, measurement and calibration, the calibration cylinder is any one of a magnetic turning plate liquid level meter, a magnetic floater type liquid level meter, a magnetic sensitive electronic double-color liquid level meter, a glass tube liquid level meter, a glass plate type liquid level meter, a color quartz tube type liquid level meter, a sight glass type liquid level meter and an ultrasonic liquid level meter.
Preferably, in order to realize the remote transmission of the liquid level metering signals, the calibration cylinder is a remote transmission type magnetic float type liquid level meter which is manufactured by utilizing a buoyancy principle, a magnetic coupling effect and a sensor, a transmitter and a display instrument.
Preferably, in order to realize remote transmission of liquid level measurement signals, the calibration cylinder comprises a shell with a flange, a magnetic floating ball liquid level transmitter with a flange, an upper interface and a bottom interface; the lower end of the magnetic floating ball liquid level transmitter extends to the lower part in the shell, and the upper end of the magnetic floating ball liquid level transmitter is connected with a flange at the top of the shell;
the magnetic floating ball liquid level transmitter can convert the liquid level into a standard electric signal and transmit the standard electric signal remotely.
Preferably, in order to realize remote transmission of liquid level metering signals, the calibration cylinder comprises a threaded shell, a threaded static pressure type liquid level transmitter, an upper interface and a bottom interface, the lower end of the static pressure type liquid level transmitter extends to the lower part in the shell, and the upper part of the static pressure type liquid level transmitter is in threaded connection with the top of the shell; more preferably, the static pressure liquid level transmitter is a magnetostrictive liquid level transmitter.
As is known in the art: the static pressure type liquid level transmitter can convert the liquid level into a standard electric signal and transmit the standard electric signal remotely; when the liquid level changes, the static pressure type liquid level transmitter can effectively measure the liquid level.
Preferably, in order to realize remote transmission of the liquid level metering signal, the calibration cylinder comprises a shell, a pressure transmitter, an upper interface and a bottom interface, wherein the pressure transmitter is arranged at the lower part of the shell.
As is known in the art: the pressure transmitter can convert the liquid level into a standard electric signal and transmit the standard electric signal remotely; when the liquid level changes, pressure transmitter can carry out effective measurement to the liquid level.
Preferably, in order to reduce the cost, the calibration cylinder comprises a shell, a pressure gauge, a top connector and a bottom connector, wherein the pressure gauge is arranged at the lower part of the shell;
the pressure gauge is a precision pressure gauge with 0.1-level precision.
As is known in the art: after the pressure value and the liquid density generated by the liquid column are known, the pressure value can be quickly converted into the corresponding liquid level; therefore, when the liquid level changes, the precision pressure gauge can effectively measure the liquid level.
Preferably, in order to reduce the cost, the calibration cylinder comprises a shell, a magnetic float, a top interface, colored iron powder and a bottom interface, wherein the magnetic float is arranged in the shell, and the colored iron powder is arranged outside the shell and at a position corresponding to the magnetic float;
the working principle is as follows: when the magnetic float rises or falls down along with the liquid level, the colored iron powder on the outer wall of the shell rises or falls along with the magnetic float, and the liquid level can be indicated.
Preferably, for convenience of management and maintenance, a pressure guide switch valve is arranged on the pressure guide port.
Furthermore, in order to facilitate installation, the medicine adding system capable of calibrating the medicine adding amount on site comprises a pump inlet pipe, a pump, a medicine conveying pipe, a flowmeter, a calibration barrel, a pressure guide port and a medicine outlet valve;
the pump inlet pipe is communicated with the pump;
the pump is communicated with the medicine conveying pipe, and a flowmeter is arranged on the medicine conveying pipe;
the side surface of the upper part of the calibration cylinder is provided with a pressure guide port, the side surface of the lower part of the calibration cylinder is communicated with the medicine conveying pipe, and the bottom of the calibration cylinder is communicated with the medicine outlet valve. Preferably, for convenience of management and maintenance, a pressure guide switch valve is arranged on the pressure guide port.
Furthermore, in order to solve the problems of dosing flow control, adjustment, metering and calibration of a 1-pump multi-tube dosing system, the dosing system capable of calibrating the dosing amount on site comprises a pump inlet tube, a pump, a manifold tee joint, a first path of dosing tube, a first path of flow meter, a first path of fixed cylinder for road sign, a first path of pressure-leading port, a first path of tee joint, a first path of medicine-discharging valve, a second path of medicine-delivering tube, a second path of flow meter, a second path of fixed cylinder for road sign, a second path of pressure-leading port, a second path of tee joint and a second path of medicine-discharging valve;
the pump inlet pipe is communicated with the pump;
the pump is communicated with 1 interface of the manifold tee, the other 1 interface of the manifold tee is communicated with the first path of medicine conveying pipe, and the 3 rd interface of the manifold tee is communicated with the second path of medicine conveying pipe;
a first path of flowmeter is arranged on the first path of medicine conveying pipe, and a second path of flowmeter is arranged on the second path of medicine conveying pipe;
the upper part of the first path calibration cylinder is provided with a first path pressure guiding opening, and the lower part of the first path calibration cylinder is respectively connected and communicated with a first path medicine conveying pipe and a first path medicine outlet valve through a first path tee joint;
the upper part of the second path calibration cylinder is provided with a second path pressure guiding opening, and the lower part of the second path calibration cylinder is respectively communicated with a second path medicine conveying pipe and a second path medicine discharging valve through a second path tee joint.
The first road marking cylinder and the second road marking cylinder can meet the production requirement of on-site rapid observation (including but not limited to visual observation) or metering the volume of the medicament entering the first road marking cylinder and the second road marking cylinder under the pressure condition, and can meet the production requirement of calibrating the first road flowmeter and the second road flowmeter; the specific form, shape, pressure resistance grade, inner diameter, outer diameter and installation mode of the first road fixing cylinder and the second road fixing cylinder can be determined by those skilled in the art according to the means in the prior art.
Preferably, the first path of medicine conveying pipe and the second path of medicine conveying pipe are identical except for length, the first path of flow meter and the second path of flow meter are identical, the first path of road calibration cylinder and the second path of road calibration cylinder are identical, the first path of tee joint and the second path of tee joint are identical, and the first path of medicine outlet valve and the second path of medicine outlet valve are identical.
Preferably, for convenience of management and maintenance, a pressure guide switch valve is arranged on the pressure guide port.
Further, for safety management, a safety valve, a pressure gauge (or a pressure transmitter), a blow-down valve and a backflow regulating valve are arranged on the pump or the medicine conveying pipe.
Known from the common sense: the pump displacement can be adjusted by the backflow adjusting valve.
In order to solve the first technical problem, a second technical solution adopted by the present invention is:
a gas field chemical adding system capable of calibrating chemical adding amount in situ comprises a drip tank, a bracket, a flowmeter, a chemical conveying pipe, a converging pipe, a regulating valve, a main switch valve, a chemical tee joint, a calibration switch valve, a calibration barrel pressure guiding pipe, a pressure guiding tee joint, a pressure guiding valve and a drip tank pressure guiding pipe;
a bracket is arranged at the lower part (or the bottom) of the drip tank;
the bottom of the drip irrigation tank is communicated with the medicine conveying pipe;
the medicine conveying pipe is provided with a flowmeter and a main switch valve;
one end of the drug delivery pipe is communicated with the side interface of the drug tee joint, and the other end of the drug delivery pipe is communicated with the bottom (or the lower part) of the drip irrigation pot;
the lower port of the medicament tee is communicated with the regulating valve, the upper port of the medicament tee is communicated with the calibration switch valve, and the side port of the medicament tee is communicated with the medicament conveying pipe;
the upper part of the calibration switch valve is communicated with the calibration cylinder, and the lower part of the calibration switch valve is communicated with the medicament tee;
the upper part of the calibration cylinder is communicated with a pressure guiding pipe of the calibration cylinder, and the lower part of the calibration cylinder is communicated with a calibration switch valve;
one end of the pressure guiding pipe of the calibration cylinder is communicated with the upper part of the calibration cylinder, and the other end of the pressure guiding pipe of the calibration cylinder is communicated with the upper part interface of the pressure guiding tee;
the side interface of the pressure guide tee is communicated with a pressure guide pipe of the drip tank, the lower part of the pressure guide tee is communicated with a pressure guide valve, and the upper part of the pressure guide tee is communicated with a pressure guide pipe of the calibration cylinder;
one end of the pressure guiding pipe of the drip irrigation tank is communicated with the upper part (or the top part) of the drip irrigation tank, and the other end is communicated with the side interface of the pressure guiding tee;
the lower part of the pressure guide valve is communicated with the upper part (or the top) of the junction pipe, and the upper part of the pressure guide valve is communicated with the lower part of the pressure guide tee;
the lower part of the regulating valve is communicated with the upper part (or the top part) of the junction pipe, and the upper part is communicated with the lower port of the medicament tee joint;
the elevation of the top of the calibration cylinder is equal to or higher than the elevation of the top of the drip tank;
the elevation of the bottom of the calibration cylinder is equal to or lower than the elevation of the bottom of the drip irrigation tank.
The calibration cylinder can meet the production requirement of on-site rapid observation (including but not limited to visual observation) or metering the volume of the medicament entering the calibration cylinder under the pressure condition, and can meet the production requirement of calibrating and calibrating the flowmeter; the specific form shape, pressure rating, inner diameter, outer diameter and mounting manner of the calibration cylinder can be determined by those skilled in the art according to the means in the prior art.
Furthermore, in order to facilitate operation, a flowmeter is arranged behind the main switch valve on the medicine conveying pipe.
Furthermore, in order to keep the dosing quantity unchanged, an auxiliary switch valve is arranged between the regulating valve and the medicament tee joint;
the upper end of the auxiliary switch valve is communicated with the lower port of the medicament tee joint, and the lower end of the auxiliary switch valve is communicated with the regulating valve.
Further: for convenience of installation and observation, the top elevation of the calibration cylinder is lower than the top elevation of the drip tank; the bottom elevation of the calibration cylinder is higher than the elevation of the bottom of the drip irrigation cylinder.
Further: in order to facilitate maintenance and management, an auxiliary pressure-leading valve is arranged on the pressure-leading pipe of the calibration cylinder.
Further: the drip tank, the bracket, the medicament tee joint and the pressure-leading tee joint are made of carbon steel or other metals; the regulating valve, the main switch valve, the calibration switch valve and the pressure-leading valve are steel valves or other metal valves; the medicine conveying pipe, the converging pipe, the calibration cylinder pressure guiding pipe and the drip tank pressure guiding pipe are steel pipes or other metal pipes; the flowmeter and the calibration cylinder are made of steel or other metals.
Further: the drug delivery pipe is any one of a non-metal pipe and a rubber pipe; more preferably, the drug delivery tube is a high pressure hose reinforced with steel wire or other high strength fibers; the bracket is made of nonmetal.
Further: the flowmeter is any one of a gear flowmeter, a rotor flowmeter, an ultrasonic flowmeter, an external clamp type ultrasonic flowmeter, a portable ultrasonic flowmeter, an electromagnetic flowmeter, a float flowmeter, a water meter, an amoebic flowmeter, a bent pipe flowmeter, a balance flowmeter, a wedge flowmeter, a target flowmeter, a vortex flowmeter, a turbine flowmeter, a pore plate flowmeter, a vortex flowmeter and a differential pressure flowmeter.
Further: the calibration cylinder is any one of a magnetic turning plate liquid level meter, a magnetic floater type liquid level meter, a magnetic sensitive electronic double-color liquid level meter, a glass tube liquid level meter, a glass plate type liquid level meter, a color quartz tube type liquid level meter, a sight glass type liquid level meter and an ultrasonic liquid level meter.
Further: the calibration cylinder is a remote transmission type magnetic floater type liquid level meter which is manufactured by utilizing a buoyancy principle, a magnetic coupling effect, a sensor, a transmitter and a display instrument.
Further: the calibration cylinder comprises a shell with a flange, a magnetic floating ball liquid level transmitter with a flange, an upper interface and a bottom interface; the lower end of the magnetic floating ball liquid level transmitter extends to the lower part in the shell, and the upper end of the magnetic floating ball liquid level transmitter is connected with a flange at the top of the shell;
the magnetic floating ball liquid level transmitter can convert the liquid level into a standard electric signal and remotely transmit the standard electric signal; when the liquid level changes, the static pressure type liquid level transmitter can effectively measure the liquid level.
Further: the calibration cylinder comprises a shell with threads, a static pressure type liquid level transmitter with threads, an upper interface and a bottom interface, wherein the lower end of the static pressure type liquid level transmitter extends to the lower part in the shell, and the upper part of the static pressure type liquid level transmitter is in threaded connection with the top of the shell;
the static pressure type liquid level transmitter is a magnetostrictive liquid level transmitter;
the static pressure type liquid level transmitter can convert the liquid level into a standard electric signal and transmit the standard electric signal remotely; when the liquid level changes, the static pressure type liquid level transmitter can effectively measure the liquid level.
Further: the calibration cylinder comprises a shell, a pressure transmitter, an upper interface and a bottom interface, wherein the pressure transmitter is arranged at the lower part of the shell;
the pressure transmitter can convert the liquid level into a standard electric signal and transmit the standard electric signal remotely; when the liquid level changes, pressure transmitter can carry out effective measurement to the liquid level.
Further: the calibration cylinder comprises a shell, a pressure gauge, a top connector and a bottom connector, wherein the pressure gauge is arranged at the lower part of the shell;
the pressure gauge is a precision pressure gauge with 0.1-level precision.
Further: the calibration cylinder comprises a shell, a magnetic float, a top interface, colored iron powder and a bottom interface, wherein the magnetic float is arranged in the shell, and the colored iron powder is arranged outside the shell and at a position corresponding to the magnetic float.
Further, for safety management, a liquid level meter, a safety valve, a pressure gauge (or a pressure transmitter), a vent valve and a drain valve are arranged on the drip tank.
Further, in order to conveniently supplement the medicament, a medicament supplementing valve is arranged on the drip tank.
Further, in order to maintain pressure, the drip tank is a closed container or/and a pressure container.
In order to solve the first technical problem, a third technical solution adopted by the present invention is:
a gas field chemical adding system capable of calibrating chemical adding amount in situ comprises a drip tank, a bracket, a chemical conveying pipe, a converging pipe, an adjusting valve, a flowmeter, a main switch valve, a chemical tee joint, a calibration cylinder pressure guiding pipe, a pressure guiding tee joint, a pressure guiding valve and a drip tank pressure guiding pipe;
a bracket is arranged at the lower part (or the bottom) of the drip tank;
the bottom of the drip irrigation tank is communicated with the medicine conveying pipe;
a main switch valve is arranged on the medicine conveying pipe;
one end of the drug delivery pipe is communicated with the side interface of the drug tee joint, and the other end of the drug delivery pipe is communicated with the bottom (or the lower part) of the drip irrigation pot;
the lower interface of the medicament tee is communicated with the flowmeter, the upper interface is communicated with the lower part or the bottom interface of the calibration cylinder, and the side interface is communicated with the medicament conveying pipe;
the upper part or the top interface of the calibration cylinder is communicated with a pressure guiding pipe of the calibration cylinder, and the lower part is communicated with an upper interface of the medicament tee;
one end of the pressure guiding pipe of the calibration cylinder is communicated with the upper part or the top interface of the calibration cylinder, and the other end of the pressure guiding pipe of the calibration cylinder is communicated with the upper interface of the pressure guiding tee;
the side interface of the pressure guide tee is communicated with a pressure guide pipe of the drip tank, the lower part of the pressure guide tee is communicated with a pressure guide valve, and the upper part of the pressure guide tee is communicated with a pressure guide pipe of the calibration cylinder;
one end of the pressure guiding pipe of the drip irrigation tank is communicated with the upper part (or the top part) of the drip irrigation tank, and the other end is communicated with the side interface of the pressure guiding tee;
the lower part of the pressure guide valve is communicated with the upper part (or the top) of the junction pipe, and the upper part of the pressure guide valve is communicated with the lower part of the pressure guide tee;
the lower interface of the flowmeter is communicated with the pressure regulating valve, and the upper part of the flowmeter is communicated with the lower interface of the medicament tee;
the lower part of the pressure regulating valve is communicated with the upper part (or the top) of the junction pipe, and the upper part is communicated with the lower interface of the flowmeter;
the elevation of the top of the calibration cylinder is equal to or higher than the elevation of the top of the drip tank;
the elevation of the bottom of the calibration cylinder is equal to or lower than the elevation of the bottom of the drip irrigation tank.
The calibration cylinder can meet the production requirement of on-site rapid observation (including but not limited to visual observation) or metering the volume of the medicament entering the calibration cylinder under the pressure condition, and can meet the production requirement of calibrating and calibrating the flowmeter; the specific form shape, pressure rating, inner diameter, outer diameter and mounting manner of the calibration cylinder can be determined by those skilled in the art according to the means in the prior art.
Further: in order to facilitate the calibration observation, a calibration switch valve is arranged between the calibration cylinder and the medicament tee;
the upper end of the calibration switch valve is communicated with a lower connector of the calibration cylinder, and the lower end of the calibration switch valve is communicated with an upper connector of the medicament tee.
Further: for convenience of installation and observation, the top elevation of the calibration cylinder is lower than the top elevation of the drip tank; the bottom elevation of the calibration cylinder is higher than the elevation of the bottom of the drip irrigation cylinder.
Further: in order to facilitate maintenance and management, an auxiliary pressure-leading valve is arranged on the pressure-leading pipe of the calibration cylinder.
Further: the drip tank, the bracket, the medicament tee joint and the pressure-leading tee joint are made of carbon steel or other metals; the regulating valve, the main switch valve, the calibration switch valve and the pressure-leading valve are steel valves or other metal valves; the medicine conveying pipe, the converging pipe, the calibration cylinder pressure guiding pipe and the drip tank pressure guiding pipe are steel pipes or other metal pipes; the flowmeter and the calibration cylinder are made of steel or other metals.
Further: the drug delivery pipe is any one of a non-metal pipe and a rubber pipe, and the bracket is made of nonmetal; more preferably, the drug delivery tube is a high pressure hose reinforced with steel wire or other high strength fibers.
Further: the flowmeter is any one of a gear flowmeter, a rotor flowmeter, an ultrasonic flowmeter, an external clamp type ultrasonic flowmeter, a portable ultrasonic flowmeter, an electromagnetic flowmeter, a float flowmeter, a water meter, an amoebic flowmeter, a bent pipe flowmeter, a balance flowmeter, a wedge flowmeter, a target flowmeter, a vortex flowmeter, a turbine flowmeter, a pore plate flowmeter, a vortex flowmeter and a differential pressure flowmeter.
Further: the calibration cylinder is any one of a magnetic turning plate liquid level meter, a magnetic floater type liquid level meter, a magnetic sensitive electronic double-color liquid level meter, a glass tube liquid level meter, a glass plate type liquid level meter, a color quartz tube type liquid level meter, a sight glass type liquid level meter and an ultrasonic liquid level meter.
Further: the calibration cylinder is a remote transmission type magnetic floater type liquid level meter which is manufactured by utilizing a buoyancy principle, a magnetic coupling effect, a sensor, a transmitter and a display instrument.
Further: the calibration cylinder comprises a shell with a flange, a magnetic floating ball liquid level transmitter with a flange, an upper interface and a bottom interface; the lower end of the magnetic floating ball liquid level transmitter extends to the lower part in the shell, and the upper end of the magnetic floating ball liquid level transmitter is connected with a flange at the top of the shell;
the magnetic floating ball liquid level transmitter can convert the liquid level into a standard electric signal and remotely transmit the standard electric signal; when the liquid level changes, the static pressure type liquid level transmitter can effectively measure the liquid level.
Further: the calibration cylinder comprises a shell with threads, a static pressure type liquid level transmitter with threads, an upper interface and a bottom interface, wherein the lower end of the static pressure type liquid level transmitter extends to the lower part in the shell, and the upper part of the static pressure type liquid level transmitter is in threaded connection with the top of the shell;
the static pressure type liquid level transmitter is a magnetostrictive liquid level transmitter;
the static pressure type liquid level transmitter can convert the liquid level into a standard electric signal and transmit the standard electric signal remotely; when the liquid level changes, the static pressure type liquid level transmitter can effectively measure the liquid level.
Further: the calibration cylinder comprises a shell, a pressure transmitter, an upper interface and a bottom interface, wherein the pressure transmitter is arranged at the lower part of the shell;
the pressure transmitter can convert the liquid level into a standard electric signal and transmit the standard electric signal remotely; when the liquid level changes, pressure transmitter can carry out effective measurement to the liquid level.
Further: the calibration cylinder comprises a shell, a pressure gauge, a top connector and a bottom connector, wherein the pressure gauge is arranged at the lower part of the shell;
the pressure gauge is a precision pressure gauge with 0.1-level precision.
Further: the calibration cylinder comprises a shell, a magnetic float, a top interface, colored iron powder and a bottom interface, wherein the magnetic float is arranged in the shell, and the colored iron powder is arranged outside the shell and at a position corresponding to the magnetic float.
Further: for safety management, a liquid level meter, a safety valve, a pressure gauge (or a pressure transmitter), a vent valve and a drain valve are arranged on the drip tank.
Further, in order to conveniently supplement the medicament, a medicament supplementing valve is arranged on the drip tank.
Further, to maintain pressure, the drip tank is a closed container or/and a pressure container.
In order to solve the second technical problem, the first technical scheme adopted by the method for the dosing system to calibrate dosing flow metering and regulating control in situ is as follows: the method comprises the following steps:
1) connecting line balance pressure:
on the top of the natural gas pipeline, a medicine outlet valve is vertically connected and communicated with the top of the natural gas pipeline by a medicine outlet pipeline, and a pressure guide port and the natural gas pipeline are connected and communicated by a pressure guide pipeline, so that the pressure in a calibration cylinder is automatically balanced with the pressure in the natural gas pipeline and the medicine outlet valve;
2) adding medicine:
opening the medicine outlet valve, starting the pump, and allowing the medicine to sequentially pass through the pump inlet pipe, the pump, the medicine conveying pipe, the flow meter, the tee joint, the medicine outlet valve and the medicine outlet pipeline under the action of gravity to enter the natural gas pipeline;
3) metering by a flowmeter:
the flow state that the medicament sequentially passes through the pump inlet pipe, the pump, the medicament conveying pipe, the flowmeter, the tee joint, the medicament outlet valve and the medicament outlet pipeline to enter the natural gas pipeline is kept under the action of gravity; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the natural gas pipeline;
4) calibrating flow meter metering error
Closing the medicine outlet valve to enable the medicine to enter the calibration barrel upwards, reading the liquid level increase value of the calibration barrel in unit time, and calculating the volume of the medicine entering the calibration barrel in unit time to obtain the medicine flow rate of the medicine entering the calibration barrel; then according to a formula of (the flow rate of the medicament entering the calibration cylinder-the average dosing flow rate entering the natural gas pipeline) ÷ the flow rate of the medicament entering the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the flowmeter;
5) calibrating and correcting medicine adding flow
Opening a medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a medicine conveying pipe, a flowmeter, a tee joint and a medicine outlet valve under the action of gravity and enter a natural gas pipeline; calibrating and measuring errors according to the flowmeter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the flowmeter which are read and recorded again;
6) adjusting the medicine adding flow to the required medicine adding amount
Calibrating a metering error according to the flowmeter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and accumulated flow of the flowmeter; and then, gradually adjusting the discharge capacity of the pump to the required dosing flow according to the corrected instantaneous flow and accumulated flow reading of the flowmeter.
Preferably, 1 valve is provided on the pressure lead line for easy maintenance and management of the calibration cartridge.
Further, in order to solve the problem of chemical dosing flow calibration of chemical dosing of a gas well, the first technical scheme adopted by the method for in-situ calibration of chemical dosing flow metering and regulation control of the chemical dosing system is as follows: the method comprises the following steps:
1) connecting line balance pressure:
the medicine outlet valve is vertically connected and communicated with the sleeve joint by a medicine outlet pipeline, and then the pressure leading port is connected and communicated with the sleeve joint by a pressure leading pipeline, so that the pressure in the calibration cylinder is automatically balanced with the pressure in the gas well sleeve;
known from the knowledge in the art: casing joints are common products in the field, and are generally connected to a casing valve through a pipe thread, and the other end of the casing joint is closed.
2) Adding medicine:
opening a medicine outlet valve, starting a pump, and allowing the medicine to sequentially pass through a pump inlet pipe, the pump, a medicine conveying pipe, a flow meter, a tee joint, a medicine outlet valve, a medicine outlet pipeline, a casing joint and a gas well casing valve under the action of gravity to enter a gas well casing;
3) metering by a flowmeter:
keeping the flow state of the medicament entering the gas well casing pipe through the pump inlet pipe, the pump, the medicament conveying pipe, the flow meter, the tee joint, the medicament outlet valve, the medicament outlet pipeline, the casing joint and the gas well casing valve in sequence unchanged; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the gas well casing;
4) calibrating flow meter metering error
Closing the medicine outlet valve to enable the medicine to enter the calibration barrel upwards, reading the liquid level increase value of the calibration barrel in unit time, and calculating the volume of the medicine entering the calibration barrel in unit time to obtain the medicine flow rate of the medicine entering the calibration barrel; then according to a formula of (the flow rate of the medicament entering a calibration cylinder-the average dosing flow rate entering a gas well casing) divided by the flow rate of the medicament entering the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the flowmeter;
5) calibrating and correcting medicine adding flow
Firstly, opening a medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a medicine conveying pipe, a flow meter 4, a tee joint, a medicine outlet valve, a medicine outlet pipeline, a casing joint and a gas well casing valve to enter a gas well casing; calibrating and measuring errors according to the flowmeter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the flowmeter which are read and recorded again;
6) adjusting the medicine adding flow to the required medicine adding amount
Calibrating a metering error according to the flowmeter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and 10-minute accumulated flow of the flowmeter; and then gradually adjusting the discharge capacity of the pump to the required dosing flow according to the corrected instantaneous flow and accumulated flow reading of the flowmeter.
Preferably, 1 valve is provided on the pressure lead line for easy maintenance and management of the calibration cartridge.
Further, in order to solve the problems of dosing flow control, adjustment, metering and calibration of the 1-pump multi-tube dosing system, the method for on-site calibration of dosing flow metering and adjustment control of the dosing system adopts a first technical scheme that: the method comprises the following steps:
1) connecting line balance pressure:
on the top of the first path of natural gas pipeline, a first path of medicine outlet pipeline is used for vertically connecting and communicating a first path of medicine outlet valve with the top of the first path of natural gas pipeline, and a first path of pressure guide pipeline is used for connecting and communicating a first path of pressure guide port and the first path of natural gas pipeline, so that the pressure in the first road marking fixed cylinder is automatically balanced with the pressure in the first path of natural gas pipeline and the first path of medicine outlet valve;
on the top of the second natural gas pipeline, a second medicine outlet pipeline is used for vertically connecting and communicating a second medicine outlet valve with the top of the second natural gas pipeline, and a second pressure guide pipeline is used for connecting and communicating a second pressure guide port and the second natural gas pipeline, so that the pressure in the second road marking fixed cylinder is automatically balanced with the pressure in the second natural gas pipeline and the second medicine outlet valve;
2) adding medicine:
opening a first path of medicine outlet valve, starting a pump, and enabling the medicine to sequentially pass through a pump inlet pipe, the pump, a manifold tee joint, a first path of medicine conveying pipe, a first path of flowmeter, a first path tee joint, a first path of medicine outlet valve and a first path of medicine outlet pipeline under the action of gravity to enter a first path of natural gas pipeline;
opening the second medicine outlet valve, and allowing the medicine to sequentially pass through the pump inlet pipe, the pump, the manifold tee joint, the second medicine conveying pipe, the second flowmeter, the second tee joint, the second medicine outlet valve and the second medicine outlet pipeline under the action of gravity to enter the natural gas pipeline;
3) metering by a flowmeter:
keeping the medicament to sequentially pass through a pump inlet pipe, a pump, a manifold tee joint, a first path of medicament conveying pipe, a first path of flow meter, a first path of tee joint, a first path of medicament outlet valve and a first path of medicament outlet pipeline under the action of gravity to enter a first path of natural gas pipeline;
keeping the medicament to sequentially enter the natural gas pipeline through the pump inlet pipe, the pump, the manifold tee joint, the second path of medicament conveying pipe, the second path of flow meter, the second path of tee joint, the second path of medicament outlet valve and the second path of medicament outlet pipeline 2 under the action of gravity;
4) calibrating flow meter metering error
Closing the first medicine outlet valve to enable the medicine to enter the calibration cylinder upwards, reading the liquid level increase value of the calibration cylinder in unit time, and calculating the volume of the medicine entering the calibration cylinder in unit time to obtain the medicine flow rate of the medicine entering the calibration cylinder; then according to a formula of (the flow of the medicament entering the calibration cylinder-the average dosing flow entering the natural gas pipeline) ÷ the flow of the medicament entering the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the first path of flow meter;
closing the second medicine outlet valve to enable the medicine to enter the calibration cylinder upwards, reading the liquid level increase value of the calibration cylinder in unit time, and calculating the volume of the medicine entering the calibration cylinder in unit time to obtain the medicine flow rate of the medicine entering the calibration cylinder; then according to a formula of the calibration metering error of the flowmeter, dividing the flow of the medicament entering the calibration cylinder by the average medicament adding flow entering the natural gas pipeline by the flow of the medicament entering the calibration cylinder by 100 percent, and obtaining the calibration metering error of the second path of flowmeter;
5) calibrating and correcting medicine adding flow
Opening a first path of medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a manifold tee joint, a first path of medicine conveying pipe, a first path of flow meter, a first path tee joint, a first path of medicine outlet valve and a first path of medicine outlet pipeline to enter a first path of natural gas pipeline under the action of gravity; calibrating the metering error according to the first path of flow meter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the first path of flow meter which are read and recorded again;
opening a second medicine outlet valve, and allowing the medicine to sequentially pass through a pump inlet pipe, a pump, a manifold tee joint, a second medicine conveying pipe, a second flowmeter, a second tee joint, a second medicine outlet valve and a second medicine outlet pipeline under the action of gravity to enter a natural gas pipeline; calibrating the metering error according to the second path of flow meter obtained in the step 4), and calibrating and correcting the instantaneous flow and the accumulated flow of the second path of flow meter which are read and recorded again;
6) adjusting the medicine adding flow to the required medicine adding amount
Calibrating a metering error according to the first path of flow meter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and accumulated flow of the first path of flow meter;
calibrating a metering error according to the second-path flowmeter obtained in the step 4), and calibrating and correcting the read and recorded instantaneous flow and accumulated flow of the second-path flowmeter;
and then, gradually adjusting the discharge capacity of the pump to the required dosing flow according to the corrected instantaneous flow and accumulated flow readings of the first path of flow meter and the second path of flow meter.
Preferably, in order to facilitate the maintenance of the calibration cylinder and the management, 1 valve is provided on each of the first and second pressure lines.
In order to solve the second technical problem, the method for the on-site calibration of dosing flow metering and regulation control of the dosing system of the invention adopts a second technical scheme that: the method comprises the following steps:
1) connecting wires and erecting:
horizontally connecting and communicating a junction pipe with one closed end with a gas well casing valve, and enabling the central line of the junction pipe and the central line of the gas well casing valve to be positioned on the same horizontal line or enabling the central line of the junction pipe to be higher than the central line of the gas well casing valve;
the bottom of the drip tank is higher than the central line of a gas well casing pipe valve and a gas well casing pipe by the conventional method;
the support can ensure that the bottom of the drip tank is higher than the central line of a gas well casing valve and a gas well casing, and can meet the production requirement that liquid medicaments automatically flow from the drip tank into the gas well casing valve and the gas well casing; the skilled person can determine the specific form, shape, material, installation of the bracket, and can determine the maximum height, minimum height, and optimal height of the bracket 2 by using the existing methods.
2) Equilibrium pressure
Opening a gas well casing valve, a pressure-leading valve, a calibration switch valve and a main switch valve to enable natural gas in a gas well casing to enter a calibration cylinder and a drip tank, further enabling the pressure in the calibration cylinder, the drip tank and the gas well casing to be balanced, and enabling liquid levels in the calibration cylinder and the drip tank to be balanced;
3) adding medicine:
opening the regulating valve, and allowing the medicament in the drip tank to automatically flow into the gas well casing through the flow meter, the medicament conveying pipe, the main switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity;
4) metering by a flowmeter:
the flow state of the medicament in the drip tank flowing into the gas well casing through the flow meter, the medicament conveying pipe, the main switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence is kept; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the gas well casing;
5) calibrating flow meter metering error
Keeping the opening degrees of the regulating valve and the calibration switch valve unchanged, closing the main switch valve, and enabling the medicament in the calibration cylinder to automatically flow into the gas well casing through the calibration switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity; reading a liquid level reduction value of the calibration cylinder in unit time, and calculating the volume of the medicament flowing out of the calibration cylinder in unit time to obtain the medicament flow rate of the medicament flowing out of the calibration cylinder; then according to a formula of (the flow of the agent flowing out of the calibration cylinder-the average medicine adding flow entering the gas well casing tube) ÷ the flow of the agent flowing out of the calibration cylinder multiplied by 100%, obtaining the calibration metering error of the flowmeter;
the test shows that: the metering error of the gear flowmeter is calibrated by the calibration cylinder to be not more than 4 percent, the requirement of national standard on the maximum allowable metering error of industrial instruments and flowmeters is met, and the production requirement of gas fields can be met.
6) Calibrating and correcting medicine adding flow
Calibrating the metering error by using the flowmeter obtained in the step 5), and calibrating and correcting the average dosing flow of the medicament obtained in the step 4) entering the gas well casing;
7) adjusting the medicine adding flow to the required medicine adding amount
Opening the main switch valve, the medicament in the drip tank automatically flows into the gas well casing through the flow meter, the medicament conveying pipe, the main switch valve, the medicament tee joint, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity, and simultaneously, part of the medicament automatically flows into the calibration cylinder to restore the balance between the liquid level of the calibration cylinder and the liquid level in the drip tank;
adjusting the opening of the adjusting valve, and repeating the steps 4) and 6) to adjust the dosing flow to the required flow.
Further, in order to facilitate the maintenance, the method also comprises the following steps:
and after the metering error of the flowmeter is calibrated, closing the auxiliary pressure-leading valve and the calibration switch valve, dismantling the calibration cylinder, and reusing the calibration cylinder for calibrating the metering error of the flowmeter of other gas wells.
In order to solve the second technical problem, the third technical solution adopted by the method for the on-site calibration dosing flow metering and regulation control of the dosing system of the invention is as follows: the method comprises the following steps:
1) connecting wires and erecting:
horizontally connecting and communicating a junction pipe with one closed end with a gas well casing valve, and enabling the central line of the junction pipe and the central line of the gas well casing valve to be positioned on the same horizontal line or enabling the central line of the junction pipe to be higher than the central line of the gas well casing valve;
the bottom of the drip tank is higher than the central line of a gas well casing pipe valve and a gas well casing pipe by the conventional method;
the support can ensure that the bottom of the drip tank is higher than the central line of a gas well casing valve and a gas well casing, and can meet the production requirement that liquid medicaments automatically flow from the drip tank into the gas well casing valve and the gas well casing; the skilled person can determine the specific form, shape, material and installation manner of the bracket, and can determine the highest height, the lowest height and the optimal height of the bracket by using the existing method.
2) Equilibrium pressure
Opening a gas well casing valve, a pressure-leading valve and a main switch valve to enable natural gas in a gas well casing to enter a calibration cylinder and a drip tank, further enabling the pressure in the calibration cylinder, the drip tank and the gas well casing to be balanced, and enabling the liquid levels in the calibration cylinder and the drip tank to be balanced;
3) adding medicine:
opening the regulating valve, and allowing the medicament in the drip tank to automatically flow into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity;
4) metering by a flowmeter:
the flow state of the medicament in the drip tank flowing into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence is kept; reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average dosing flow of the medicament entering the gas well casing;
5) calibrating flow meter metering error
Keeping the opening of the regulating valve unchanged, closing the main switch valve, and enabling the medicament in the calibration cylinder to automatically flow into the gas well casing through the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity; reading the liquid level reduction value of the calibration cylinder in unit time, and calculating the volume of the medicament flowing out of the calibration cylinder in unit time to obtain the medicament flow rate of the medicament flowing out of the calibration cylinder; then according to a formula of (the flow of the agent flowing out of the calibration cylinder-the average medicine adding flow entering the gas well casing tube) ÷ the flow of the agent flowing out of the calibration cylinder multiplied by 100%, obtaining the calibration metering error of the flowmeter;
6) calibrating and correcting medicine adding flow
Calibrating the metering error by using the flowmeter obtained in the step 5), and calibrating and correcting the average dosing flow of the medicament obtained in the step 4) entering the gas well casing;
7) adjusting the medicine adding flow to the required medicine adding amount
Opening the main switch valve, the medicament in the drip tank automatically flows into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity, and simultaneously, part of the medicament automatically flows into the calibration cylinder to restore the balance between the liquid level of the calibration cylinder and the liquid level in the drip tank;
adjusting the opening of the adjusting valve, and repeating the steps 4) and 6) to adjust the dosing flow to the required flow.
Or, the method comprises the following steps:
1) connecting wires and erecting:
horizontally connecting and communicating a junction pipe with one closed end with a gas well casing valve, and enabling the central line of the junction pipe and the central line of the gas well casing valve to be positioned on the same horizontal line or enabling the central line of the junction pipe to be higher than the central line of the gas well casing valve;
the bottom of the drip tank is higher than the central line of a gas well casing pipe valve and a gas well casing pipe by the conventional method;
the support can ensure that the bottom of the drip tank is higher than the central line of a gas well casing valve and a gas well casing, and can meet the production requirement that liquid medicaments automatically flow from the drip tank into the gas well casing valve and the gas well casing; the skilled person can determine the specific form, shape, material and installation manner of the bracket, and can determine the highest height, the lowest height and the optimal height of the bracket by using the existing method.
2) Equilibrium pressure
Opening a gas well casing valve, a pressure-leading valve and a main switch valve to enable natural gas in a gas well casing to enter a calibration cylinder and a drip tank, further enabling the pressure in the calibration cylinder, the drip tank and the gas well casing to be balanced, and enabling the liquid levels in the calibration cylinder and the drip tank to be balanced;
3) adding medicine:
opening the regulating valve, and allowing the medicament in the drip tank to automatically flow into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity;
as is known in the art: the gear flowmeter is taken as an example, and is allowed to be installed and used on a vertical pipeline or a vertical pipeline.
4) Calibrating flow meter metering error
Closing the main switch valve, and allowing the medicament in the calibration cylinder to automatically flow into the gas well casing through the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity; reading the liquid level reduction value of the calibration cylinder in unit time, and calculating the volume of the medicament flowing out of the calibration cylinder in unit time to obtain the medicament flow rate of the medicament flowing out of the calibration cylinder;
meanwhile, reading and recording the instantaneous flow and the accumulated flow of the flowmeter to obtain the average flow value of the flowmeter;
then according to a formula of (the flow of the medicament flowing out of the calibration cylinder-the average flow value of the flowmeter) ÷ the flow of the medicament flowing out of the calibration cylinder multiplied by 100 percent, obtaining the calibration metering error of the flowmeter;
5) calibrating and correcting medicine adding flow
Calibrating a metering error by using the flowmeter obtained in the step 4), and calibrating and correcting the average flow value of the flowmeter obtained in the step 4);
6) adjusting the medicine adding flow to the required medicine adding amount
Opening the main switch valve, the medicament in the drip tank automatically flows into the gas well casing through the medicament conveying pipe, the main switch valve, the medicament tee joint, the flowmeter, the regulating valve, the junction pipe and the gas well casing valve in sequence under the action of gravity, and simultaneously, part of the medicament automatically flows into the calibration cylinder to restore the balance between the liquid level of the calibration cylinder and the liquid level in the drip tank;
adjusting the opening of the adjusting valve, and repeating the steps 4) and 5) to adjust the dosing flow to the required flow.
Further, in order to facilitate the maintenance, the method also comprises the following steps:
and after the metering error of the flowmeter is calibrated, closing the auxiliary pressure-leading valve and the calibration switch valve, dismantling the calibration cylinder, and reusing the calibration cylinder for calibrating the metering error of the flowmeter of other gas wells.
The invention has the following beneficial effects: the invention overcomes the defects of dosing flow metering, adjusting and controlling of the existing dosing system, can calibrate the dosing flow (or dosing quantity) on site in a production field, can effectively solve the problems of dosing flow metering, adjusting, controlling and bias flow of the dosing system, can save the dosing quantity, and can meet the dosing requirement required by production; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.
Drawings
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings
FIG. 1 is a schematic view of a prior art 1-pump 3-tube dosing system;
FIG. 2 is a schematic diagram of a prior art flowmeter calibration apparatus of embodiment 36;
FIG. 3 is a schematic view of the dosing system of example 1;
FIG. 4 is a schematic view of the dosing system of example 2;
FIG. 5 is a schematic view of the dosing system of example 3;
FIG. 6 is a schematic structural view of a calibration cylinder in example 9;
FIG. 7 is a schematic view of the calibration cylinder in example 10;
FIG. 8 is a schematic structural view of a calibration cylinder in example 11;
FIG. 9 is a schematic view of the calibration cylinder in example 12;
FIG. 10 is a schematic view of the calibration cylinder in example 13;
FIG. 11 is a schematic view of the drug administration system of example 14;
FIG. 12 is a schematic view of the drug administration system of example 16;
FIG. 13 is a schematic view of an atmospheric calibration test device for a flowmeter according to examples 16 and 21;
FIG. 14 is a schematic view of the drug administration system of example 18;
FIG. 15 is a schematic view of a drug administration system according to example 19;
FIG. 16 is a schematic view of a drug administration system according to example 20;
FIG. 17 is a schematic illustration of the in situ calibrated natural gas line dosing flow method of example 36;
FIG. 18 is a schematic illustration of the in situ calibration gas well dosing flow method of example 38;
FIG. 19 is a schematic illustration of the in situ calibrated natural gas line dosing flow method of example 40;
FIG. 20 is a schematic illustration of the in situ calibrated natural gas line dosing flow method of example 42;
FIG. 21 is a schematic illustration of the in situ calibrated natural gas line dosing flow method of example 44;
FIG. 22 is a schematic illustration of the in situ calibration gas well feedrate method of example 46;
FIG. 23 is a schematic illustration of the in situ calibration gas well feedrate method of example 47;
FIG. 24 is a schematic illustration of the in situ calibration gas well feedflow method of example 48;
FIG. 25 is a schematic illustration of the in situ calibration gas well feedrate method of example 49;
FIG. 26 is a schematic illustration of the in situ calibration gas well dosing flow method of example 50;
FIG. 27 is a schematic illustration of the in situ calibration gas well dosing flow method of example 51;
Detailed Description
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