阅读说明：本技术 一种基于差分阀的气井采气系统及其控制方法 (Gas well gas production system based on differential valve and control method thereof ) 是由 冯志强 刘丽娟 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种基于差分阀的气井采气系统,系统内包括采气树和控制装置,所述采气树设置有套压信号采集装置、油压信号采集装置、流量信号采集装置、电动执行器和差分阀,差分阀的输入端连接于电动执行器,电动执行器的供电输入端连接于设有的供电机构；流量信号采集装置、油压信号采集装置、套压信号采集装置均连接于系统内设有的变送器及套压无线发射模块,所述控制装置包括无线通信模块和定位模块,电动执行器设置于差分阀的顶部且输出端置于差分阀内,本案还公开了一种基于差分阀的气井采气控制方法,采用本技术方案,可以有效对井口数据收集、备份,提高设备的稳定性,降低了维修次数及成本。(The invention discloses a gas well gas production system based on a differential valve, which comprises a gas production tree and a control device, wherein the gas production tree is provided with a casing pressure signal acquisition device, an oil pressure signal acquisition device, a flow signal acquisition device, an electric actuator and the differential valve; the scheme also discloses a gas well gas production control method based on the differential valve, and by adopting the technical scheme, well head data can be effectively collected and backed up, the stability of equipment is improved, and the maintenance times and cost are reduced.)

1. A gas well gas production system based on a differential valve is characterized in that: the system comprises a gas production tree and a control device, wherein the gas production tree is provided with a casing pressure signal acquisition device, an oil pressure signal acquisition device, a flow signal acquisition device, an electric actuator and a differential valve, the input end of the differential valve is connected with the electric actuator, and the power supply input end of the electric actuator is connected with an arranged power supply mechanism; the sleeve pressure signal acquisition device is sleeved and pressed on a transmitter and a sleeve pressure wireless transmitting module which are arranged in the system; the oil pressure signal acquisition device is arranged on the transmitter and the oil pressure wireless transmitting module in an oil pressure mode; the flow signal acquisition device has a pressure difference between the transmitter and the flow wireless transmitting module, the control device comprises a wireless communication module and a positioning module, a power supply port which is formed by power supply mechanisms is used for providing a working power supply for the control device, and the electric actuator is arranged at the top of the differential valve and the output end of the electric actuator is arranged in the differential valve.

2. A gas well gas production system according to claim 1, wherein the power supply mechanism comprises a main solar power supply device and a battery box electrically connected with the main solar power supply device, the battery box is installed underground, the main solar power supply device and the battery box are integrated, a storage battery is arranged in the battery box, a charge and discharge protection module connected with the storage battery is arranged in the battery box, and the electric actuator is electrically connected with the battery box.

3. Gas well gas production system according to claim 1, characterized in that a valve stem for transmitting power is arranged between the differential valve and the electric actuator, the front end of the valve rod is provided with a valve core sealing ring and a cage sleeve, the electric actuator drives the valve core sealing ring and the cage sleeve to compress or loosen the differential valve by controlling the valve rod, so as to realize the opening and closing of the valve, a pressure guide air passage is also arranged in the valve rod, so that the two sides of the valve rod are isobaric through the pressure guide air passage, and reduces the push-pull force for opening and closing the valve, the outer surface of the valve rod is provided with a position indicating sheet, the electric actuator is internally provided with a connecting bracket, the connecting bracket is internally provided with a position indicating plate, a front position sensor and a rear position sensor, the signal output ends of the front position sensor and the rear position sensor are connected with the control device and provide signal input for opening, closing and opening adjustment for the control system.

4. The gas well gas production system according to claim 1, wherein the differential valve comprises a valve body and a valve cover, the valve body and the valve cover are fixed through screws, the valve body is provided with a valve cavity, an air inlet channel and an air outlet channel, a cage is arranged in the valve cavity, an axially movable valve core is arranged in the cage, the valve core is connected with a thrust valve rod extending out of the valve cover, and a filler for sealing is arranged between the thrust valve rod and the valve cover; the lateral wall of cage cover be provided with the inlet port of intake duct intercommunication, the front end of cage cover be provided with the venthole of venthole intercommunication, the front end terminal surface of case is equipped with the case sealing washer of high strength, is provided with the recess at the front end terminal surface of case, and the case sealing washer is inlayed and is established in the recess, the diameter of case sealing washer is greater than the diameter of venthole, the axial force through the thrust valve rod between cage cover and the case realizes forming shearing breaking force to ice stifled hydrate.

5. A gas well gas recovery system as claimed in claim 4, wherein a sleeve gasket is provided between the side wall of the valve element and the cage, the sleeve gasket being located on the rear side of the gas inlet. A front cavity sleeve sealing ring is arranged between the front end of the cage sleeve and the valve cavity, a rear cavity sleeve sealing ring is arranged between the side wall of the cage sleeve and the valve cavity, and the rear cavity sleeve sealing ring is positioned on the rear side of the air inlet.

6. A gas well gas production system as claimed in claim 3, wherein the electric actuator comprises a housing, the connecting bracket is arranged at one end of the housing, an explosion-proof cylinder is arranged at the other end of the housing, a stepping motor is arranged in the explosion-proof cylinder, a wireless communication module is arranged in the stepping motor, the housing is connected with a correspondingly arranged transmission nut through a double bearing, a thrust screw rod in threaded engagement is arranged in the transmission direction of the transmission nut, and the end part of the thrust screw rod extends into the connecting bracket; the stepping motor is connected with the transmission nut through a speed reducer, the transmission nut is installed in the nut driving disc, the speed reducer is connected with the nut driving disc, and one end of the thrust valve rod extends into the connecting support to be in butt joint with the thrust screw rod.

7. The gas well gas production system as recited in claim 6, wherein the end position of the shaft of the stepping motor extends out of the explosion-proof cylinder, and a hand wheel with a position indicator is arranged at the output end of the stepping motor.

8. A gas well gas production control method based on a differential valve comprises the gas well gas production system based on the differential valve as claimed in any one of claims 1 to 7, and is characterized in that the system under automatic control can complete opening and closing of an electric actuator and opening control of the differential valve according to oil pressure, casing pressure and flow signals and a program set in a control device, when the oil pressure of a gas well is insufficient, the differential valve is closed, the gas well shut-in pressure is recovered, when the oil pressure rises to a threshold value set by control software, the differential valve is opened slowly, the gas well starts to produce, the flow signals collected by a flowmeter in the system are collected to control the opening of the differential valve, the gas flow rate in a shaft is ensured to be within a maximum liquid carrying amount range, and intermittent control of the gas well can be realized through opening and closing of the differential valve according to preset casing pressure and oil pressure conditions, the maximization of the liquid carrying amount of the gas is realized;

otherwise, the system is in a remote mode, and the control signal is input into the system in a wireless communication transmission mode to adjust the opening and closing of the stop composite valve.

Technical Field

The invention belongs to the field of hydraulic control, and particularly relates to a gas well gas production system based on a differential valve and a control method thereof.

Background

In the experiment of adjusting the flow by the needle valve, the needle valve is in a gas production standard configuration and is used for adjusting the yield. The needle valve is used as a regulating valve, does not have the stopping performance and is usually matched with a gas production tree gate valve for use. The needle valve is connected with an electric actuator and used as an air well spacing opening actuating mechanism, but the needle valve cannot be well closed to a short extent, especially under the condition of sand grains, effective repression cannot be guaranteed, a spacing opening system adopts GPRS data remote transmission, good online rate cannot be guaranteed, the needle valve cannot be automatically online after being disconnected, manual site resetting is needed, however, transmission and power supply links needed by remote control are too many, the probability of fault occurrence is increased, the equipment stability is reduced, maintenance times are invisibly increased, the order of wellhead production is directly influenced, and the cost of multiple parties is increased.

Disclosure of Invention

The invention aims to provide a gas well gas production system based on a differential valve and a control method thereof.

In order to achieve the purpose, the invention adopts the technical scheme that:

a gas well gas production system based on a differential valve comprises a gas production tree and a control device, wherein the gas production tree is provided with a casing pressure signal acquisition device, an oil pressure signal acquisition device, a flow signal acquisition device, an electric actuator and the differential valve, the input end of the differential valve is connected with the electric actuator, and the power supply input end of the electric actuator is connected with a power supply mechanism; the sleeve pressure signal acquisition device is sleeved and pressed on a transmitter and a sleeve pressure wireless transmitting module which are arranged in the system; the oil pressure signal acquisition device is arranged on the transmitter and the oil pressure wireless transmitting module in an oil pressure mode; the flow signal acquisition device has a pressure difference between the transmitter and the flow wireless transmitting module, the control device comprises a wireless communication module and a positioning module, a power supply port which is formed by power supply mechanisms is used for providing a working power supply for the control device, and the electric actuator is arranged at the top of the differential valve and the output end of the differential valve.

The invention discloses a gas well gas production system based on a differential valve, wherein a power supply mechanism comprises a main solar power supply device and a battery box electrically connected with the main solar power supply device, the battery box is installed in a buried manner, the main solar power supply device and the battery box are integrated, a storage battery is arranged in the battery box, a charging and discharging protection module connected with the storage battery is arranged in the battery box, and an electric actuator is electrically connected with the battery box.

The invention discloses a gas well gas production system based on a differential valve, a valve rod for transmitting power is arranged between the differential valve and an electric actuator, the front end of the valve rod is provided with a valve core sealing ring and a cage sleeve, the electric actuator drives the valve core sealing ring and the cage sleeve to compress or loosen the differential valve by controlling the valve rod, so as to realize the opening and closing of the valve, a pressure guide air passage is also arranged in the valve rod, so that the two sides of the valve rod are isobaric through the pressure guide air passage, and reduces the push-pull force for opening and closing the valve, the outer surface of the valve rod is provided with a position indicating sheet, the electric actuator is internally provided with a connecting bracket, the connecting bracket is internally provided with a position indicating plate, a front position sensor and a rear position sensor, the signal output ends of the front position sensor and the rear position sensor are connected with the control device and provide signal input for opening, closing and opening adjustment for the control system.

The invention discloses a gas well gas production system based on a differential valve, wherein the differential valve comprises a valve body and a valve cover, the valve body and the valve cover are fixed through screws, the valve body is provided with a valve cavity, an air inlet channel and an air outlet channel, a cage is arranged in the valve cavity, an axially movable valve core is arranged in the cage, the valve core is connected with a thrust valve rod extending out of the valve cover, and a filler for sealing is arranged between the thrust valve rod and the valve cover; the lateral wall of cage cover be provided with the inlet port of intake duct intercommunication, the front end of cage cover be provided with the venthole of venthole intercommunication, the front end terminal surface of case is equipped with the case sealing washer of high strength, is provided with the recess at the front end terminal surface of case, and the case sealing washer is inlayed and is established in the recess, the diameter of case sealing washer is greater than the diameter of venthole, the axial force through the thrust valve rod between cage cover and the case realizes forming shearing breaking force to ice stifled hydrate.

The invention discloses a gas well gas production system based on a differential valve. A front cavity sleeve sealing ring is arranged between the front end of the cage sleeve and the valve cavity, a rear cavity sleeve sealing ring is arranged between the side wall of the cage sleeve and the valve cavity, and the rear cavity sleeve sealing ring is positioned on the rear side of the air inlet.

The invention discloses a gas well gas production system based on a differential valve, wherein an electric actuator comprises a shell, a connecting support is arranged at one end of the shell, an explosion-proof cylinder is arranged at the other end of the shell, a stepping motor is arranged in the explosion-proof cylinder, a wireless communication module is arranged in the stepping motor, the shell is connected with a correspondingly arranged transmission nut through a double bearing, a thrust screw rod meshed with threads is arranged in the transmission direction of the transmission nut, and the end part of the thrust screw rod extends into the connecting support; the stepping motor is connected with the transmission nut through a speed reducer, the transmission nut is installed in the nut driving disc, the speed reducer is connected with the nut driving disc, and one end of the thrust valve rod extends into the connecting support to be in butt joint with the thrust screw rod.

The invention discloses a gas well gas production system based on a differential valve.

The invention discloses a gas well gas production control method based on a differential valve, wherein the system can complete opening and closing of an electric actuator and opening control of the differential valve according to a program set in a control device under automatic control according to oil pressure, casing pressure and flow signals, the differential valve is closed when the oil pressure of a gas well is insufficient, the gas well shut-in pressure is recovered, when the oil pressure rises to a threshold value set by control software, the differential valve is slowly opened and starts to produce, the opening of the differential valve is controlled by collecting the flow signals collected by a flow meter in the system, the gas flow speed in a shaft is ensured to be in a maximum liquid carrying amount range, and the intermittent control of the gas well can be realized by opening and closing the differential valve according to preset casing pressure and oil pressure conditions, so that the gas carrying amount is maximized;

otherwise, the system is in a remote mode, and the control signal is input into the system in a wireless communication transmission mode to adjust the opening and closing of the stop composite valve.

Adopt this technical scheme, through adopting the big thrust electric actuator of present case, because the auto-lock characteristic of drive nut, even the moment of torsion of drive nut disappears, thrust also can continue to keep, and simultaneously, drive nut's support adopts duplex bearing structure in order to reduce the movement clearance of drive nut mechanism, the thrust of thrust screw rod keeps under making step motor power-off condition, can reduce electric actuator's power consumption, step motor need not to be circular telegram work all the time when no executive action, equipment adopts local control and high in the clouds remote control, even the condition of falling the line appears, can not influence control system and data entry yet, can also accomplish that the local teletransmission of relevant operational data all has the backup, the well head instrument has adopted wired connection, the threading uses explosion-proof flexible tube, thereby improve equipment stability, maintenance number of times and cost have been reduced.

The invention will be explained in more detail below with reference to the drawings and examples.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 is a schematic diagram of the assembly of a differential valve and an electric actuator in a gas well gas production system of the present invention.

Labeled as: 1. a differential valve; 2. an exhaust valve; 3. a valve core sealing ring; 4. a cage sleeve; 5. the seal ring compresses the screw; 6. a seal ring; 7. a valve clack sleeve; 9. connecting a bracket; 10. a valve stem; 11. a valve cover; 16. a filler; 19. a gland; 20. a screw; 24. an electric actuator.

Detailed Description

The following description of the embodiments of the present invention, with reference to the accompanying drawings, will be made in further detail for the purpose of providing a more complete, accurate and thorough understanding of the inventive concepts and technical solutions of the present invention, including the shapes of the components, the structures, the mutual positions and connection relationships of the components, the functions and operating principles of the components, the manufacturing processes, the operation and use methods, and the like.

The gas well gas production system comprises a gas production tree and a control device, wherein the gas production tree is provided with a casing pressure signal acquisition device, an oil pressure signal acquisition device, a flow signal acquisition device, an electric actuator and a differential valve; the sleeve pressure signal acquisition device is sleeved and pressed on a transmitter and a sleeve pressure wireless transmitting module which are arranged in the system; the oil pressure signal acquisition device is arranged on the transmitter and the oil pressure wireless transmitting module in an oil pressure mode; flow signal collection system pressure differential in changer and flow wireless transmission module, controlling means includes wireless communication module and orientation module, controlling means provides working power supply by the power supply port that power supply mechanism divided to establish, and electric actuator sets up in the difference valve is arranged in to the top of difference valve and output, power supply mechanism include main solar power supply unit and with the battery box that main solar power supply unit electricity is connected, and this battery box buries ground installation, and main solar power supply unit and battery box set up as an organic whole, are provided with the battery in the battery box, and are provided with the charge-discharge protection module that links to each other with the battery, electric actuator with the battery box electricity is connected.

FIG. 1 is an assembly diagram of a differential valve and an electric actuator in a gas well gas production system according to the present invention, wherein a valve rod 10 for transmitting power is disposed between the differential valve 1 and the electric actuator 24 shown in FIG. 1, a valve core seal ring and a cage are disposed at the front end of the valve rod, the electric actuator drives the valve core seal ring and the cage to compress or release the differential valve by controlling the valve rod to open and close the valve, a pressure guide air passage is further disposed in the valve rod to equalize pressure on both sides of the valve rod through the pressure guide air passage and reduce the push-pull force for opening and closing the valve, a position indicator is disposed on the outer surface of the valve rod, a connecting bracket 9 is disposed in the electric actuator, a position indicator, a front position sensor and a rear position sensor are disposed in the connecting bracket, the signal output ends of the front position sensor and the rear position sensor are connected to the control device, and provide an opening for the control system, The differential valve comprises a valve body and a valve cover 11, the valve body and the valve cover are fixed through screws, the valve body is provided with a valve cavity, an air inlet channel and an air outlet channel, a cage is installed in the valve cavity, an axially movable valve core is installed in the cage, the valve core is connected with a thrust valve rod extending out of the valve cover, and a filler for sealing is arranged between the thrust valve rod and the valve cover; the lateral wall of cage cover be provided with the inlet port of intake duct intercommunication, the front end of cage cover be provided with the venthole of venthole intercommunication, the front end terminal surface of case is equipped with the case sealing washer of high strength, is provided with the recess at the front end terminal surface of case, and the case sealing washer is inlayed and is established in the recess, the diameter of case sealing washer is greater than the diameter of venthole, the axial force through the thrust valve rod between cage cover and the case realizes forming shearing breaking force to ice stifled hydrate, the lateral wall of case with be provided with the cover core sealing washer between the cage cover, the cover core sealing washer is located the rear side of inlet port. A front cavity sleeve sealing ring is arranged between the front end of the cage sleeve and the valve cavity, a rear cavity sleeve sealing ring is arranged between the side wall of the cage sleeve and the valve cavity, and the rear cavity sleeve sealing ring is positioned on the rear side of the air inlet.

The electric actuator comprises a shell, wherein the connecting support is arranged at one end of the shell, an explosion-proof cylinder is arranged at the other end of the shell, a stepping motor is arranged in the explosion-proof cylinder, a wireless communication module is arranged in the stepping motor, the shell is connected with a correspondingly arranged transmission nut through a double bearing, a thrust screw rod meshed with threads is arranged in the transmission direction of the transmission nut, and the end part of the thrust screw rod extends into the connecting support; step motor pass through the reduction gear with drive nut connects, and drive nut installs in the nut driving-disc, and the reduction gear is connected with the nut driving-disc, and the one end of thrust valve rod stretches into in the linking bridge with the thrust screw rod docks mutually, and the end position of step motor's axle stretches out explosion-proof section of thick bamboo is outside, and step motor's output is provided with the hand wheel of taking the position indication table.

The scheme also discloses a gas well gas production control method based on a differential valve, the system can complete opening and closing of an electric actuator and opening control of the differential valve according to a program set in a control device under automatic control according to oil pressure, casing pressure and flow signals, when the oil pressure of a gas well is insufficient, the differential valve is closed, the gas well shut-in pressure is recovered, when the oil pressure rises to a threshold value set by control software, the differential valve is slowly opened and starts production, the opening of the differential valve is controlled through the flow signals collected by a flow meter in the system, the gas flow velocity in a shaft is ensured to be in a maximum liquid carrying amount range, and the intermittent control of the gas well can be realized through opening and closing of the differential valve according to preset casing pressure and oil pressure conditions, so that the gas carrying amount is maximized;

otherwise, the system is in a remote mode, and the control signal is input into the system in a wireless communication transmission mode to adjust the opening and closing of the stop composite valve.

The storage battery (lithium battery) has stronger durability, long service life, light weight and small volume. The electric regulating valve adopts an explosion-proof actuator, and the pressure grade is 70 MPa; the thrust of the electric actuator can reach 20000 cattle, and the full-open time (24V DC power supply) can be finished within 17 seconds; the communication modes are diversified (485, 4-20mA and 4G).

The control mode of the system can be automatic/remote, and the opening and closing of the electric actuator and the opening control of the differential valve can be completed according to oil pressure, sleeve pressure and flow signals in the automatic mode and control software in the control device. When the oil pressure of the gas well is insufficient, the differential regulating valve is closed, the shut-in pressure of the gas well is recovered, when the oil pressure rises to a threshold value set by control software, the differential valve is slowly opened, the gas well starts to produce, the opening degree of the differential valve is controlled by the control software through flow signals collected by the flow meter, so that the gas flow speed in a shaft is ensured to be within the maximum liquid carrying amount range, the intermittent control of the gas well can be realized through the opening and closing of the differential valve according to the set pressure and oil pressure conditions preset by the software, the maximization of the liquid carrying amount of the gas is realized, and various control requirements in the gas well exploitation process are met.

The remote mode has two modes, one mode is to realize the opening, closing and opening control of the stop composite valve by using an RS485 transmission mode through an RTU (remote terminal Unit) of the oil field and a digital control network of the oil field, and the other mode is to realize the opening, closing and opening control of the differential valve at the background through a GPRS (general packet radio service) module (mobile phone communication network).

Adopt this technical scheme, through adopting the big thrust electric actuator of present case, because the auto-lock characteristic of drive nut, even the moment of torsion of drive nut disappears, thrust also can continue to keep, and simultaneously, drive nut's support adopts duplex bearing structure in order to reduce the movement clearance of drive nut mechanism, the thrust of thrust screw rod keeps under making step motor power-off condition, can reduce electric actuator's power consumption, step motor need not to be circular telegram work all the time when no executive action, equipment adopts local control and high in the clouds remote control, even the condition of falling the line appears, can not influence control system and data entry yet, can also accomplish that the local teletransmission of relevant operational data all has the backup, the well head instrument has adopted wired connection, the threading uses explosion-proof flexible tube, thereby improve equipment stability, maintenance number of times and cost have been reduced.

The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.