阅读说明：本技术 一种数控油井套压控制装置 (Numerical control oil well casing pressure control device ) 是由 李建波 贺伦斌 钱玉斌 殷江虹 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种数控油井套压控制装置,包括直流电源、空气开关、接触器式继电器、智能单回路测控仪、常闭电动控制阀以及压力变送器；直流电源与空气开关连接,空气开关与接触器式继电器连接,接触器式继电器与智能单回路测控仪连接,智能单回路测控仪与常闭电动控制阀连接；常闭电动控制阀一端与套管阀连接,另一端与原取样阀连接,原取样阀接生产管线,套阀连接管与常闭电动控制阀之间接压力变送器；压力变送器与智能单回路测控仪通信连接。本发明能够对油井套压进行设定和方便随时修改,油井安装数控套压控制装置后,油井套压会被实时控制在比较合理范围内,对比现有套压控制方法,该装置更加节能增产,提高油井产能,方便套管气的回收。(the invention discloses a numerical control oil well casing pressure control device, which comprises a direct-current power supply, an air switch, a contactor type relay, an intelligent single-loop measurement and control instrument, a normally closed electric control valve and a pressure transmitter, wherein the direct-current power supply is connected with the air switch; the direct-current power supply is connected with an air switch, the air switch is connected with a contactor type relay, the contactor type relay is connected with an intelligent single-loop measurement and control instrument, and the intelligent single-loop measurement and control instrument is connected with a normally-closed electric control valve; one end of the normally closed electric control valve is connected with the casing valve, the other end of the normally closed electric control valve is connected with the original sampling valve, the original sampling valve is connected with a production pipeline, and a casing valve connecting pipe is connected with a pressure transmitter between the normally closed electric control valve; the pressure transmitter is in communication connection with the intelligent single-loop measurement and control instrument. The invention can set and conveniently modify the casing pressure of the oil well at any time, after the oil well is provided with the numerical control casing pressure control device, the casing pressure of the oil well can be controlled in a more reasonable range in real time, compared with the existing casing pressure control method, the device has the advantages of saving energy, increasing the yield, improving the productivity of the oil well and facilitating the recovery of casing gas.)

1. a numerical control oil well casing pressure control device is characterized by comprising a direct-current power supply, an air switch, a contactor type relay, an intelligent single-loop measurement and control instrument, a normally closed electric control valve and a pressure transmitter;

The direct-current power supply is connected with the air switch, the air switch is connected with the contactor type relay through a first wiring terminal, the contactor type relay is connected with the intelligent single-loop measurement and control instrument through a second wiring terminal, and the intelligent single-loop measurement and control instrument is connected with the normally-closed electric control valve;

one end of the normally closed electric control valve is connected with a sleeve valve through a sleeve valve connecting pipe, the other end of the normally closed electric control valve is connected with an original sampling valve through a one-way valve, the original sampling valve is connected with a production pipeline, and the pressure transmitter is connected between the sleeve valve connecting pipe and the normally closed electric control valve;

The signal output end of the pressure transmitter is connected with a first cable, the signal input end of the intelligent single-loop measurement and control instrument is connected with a second cable, and the first cable is connected with the second cable through a third wiring terminal.

2. The numerical control oil well casing pressure control device according to claim 1, wherein the direct current power supply, the air switch, the contactor type relay and the intelligent single-loop measurement and control instrument are arranged in a first control cabinet; the normally closed electric control valve and the pressure transmitter are arranged in a second control cabinet, and an observation window for observing data of the pressure transmitter is arranged on the second control cabinet.

3. The numerical control oil well casing pressure control device according to claim 1 or 2, further comprising a branch between the check valve and the original sampling valve, wherein the branch is connected with a sampling valve.

4. The digitally controlled well casing pressure control device of claim 1 or claim 2, wherein the air switch is a DZ 472P switch.

5. The numerical control casing pressure control device for the oil well as defined in claim 1 or 2, wherein the second and third connection terminals are TB2506 terminals.

6. The numerical control casing pressure control device for oil wells according to claim 1 or 2, wherein the first wiring terminal is a TB2503 terminal.

7. The digitally controlled well casing pressure control device of claim 1, wherein the production line is connected to a production valve, the production valve being connected to a christmas tree.

Technical Field

The invention belongs to the technical field of oil extraction engineering, and particularly relates to a numerical control oil well casing pressure control device.

Background

In mechanical oil recovery, well casing pressure is an important parameter for production from pumping wells. The change of the casing pressure directly affects the sinking degree, the pumping efficiency and the like of the oil well, and further affects the yield of the oil well. The effect of casing pressure on the well is as follows:

(1) Influence of casing pressure on oil well pumping efficiency

When the temperature and pressure are reduced in the production process of the oil well, gas dissolved in petroleum is separated out and accumulated in the upper part of the annular space of the casing to form casing gas. The more the sleeve gas is, the higher the sleeve pressure is, and the working fluid level is forced to fall. When the working fluid level drops to the suction inlet of the pump, air flees into the deep-well pump, occupies partial volume of the oil pumping pump, and causes the reduction of the pump efficiency. In severe cases, air lock is easily caused, and the production of an oil well is stopped.

(2) Influence of casing gas release on oil well production

The higher the casing pressure is, the lower the working fluid level is, the smaller the pump submergence is, the lower the pump efficiency is, and the less the oil well yield is; on the contrary, the sleeve pressure can be controlled at a reasonable pressure value by discharging the sleeve gas, so that the oil liquid level is stabilized at a reasonable value, and the stable improvement of the oil well yield is facilitated.

(3) At present, the control method of the casing pressure of the oil well is generally finished by manually releasing the casing pressure, firstly, the casing valve is manually opened to discharge the casing gas into the atmosphere, and the method wastes resources and pollutes the environment; and the other method is to connect and install a constant-pressure sleeve gas discharging pipeline between the sleeve valve and the gathering and transportation process. The second method is to weld the rated pressure check valve on the sleeve valve and connect with the gathering flow through the metal pipeline, and put the sleeve gas into the gathering flow for recycling. The disadvantages of manual work include too many defects caused by the influence of human factors and high labor cost. The constant-pressure automatic sleeve placing device has obvious advantages compared with manual sleeve placing, and has the defect that the later pressure calibration and the device maintenance are very inconvenient.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a numerical control oil well casing pressure control device which can save energy, increase production and facilitate the recovery of casing gas, and the technical scheme is as follows:

A numerical control oil well casing pressure control device comprises a direct-current power supply, an air switch, a contactor type relay, an intelligent single-loop measurement and control instrument, a normally closed electric control valve and a pressure transmitter;

The direct-current power supply is connected with the air switch, the air switch is connected with the contactor type relay through a first wiring terminal, the contactor type relay is connected with the intelligent single-loop measurement and control instrument through a second wiring terminal, and the intelligent single-loop measurement and control instrument is connected with the normally-closed electric control valve;

one end of the normally closed electric control valve is connected with a sleeve valve through a sleeve valve connecting pipe, the other end of the normally closed electric control valve is connected with an original sampling valve through a one-way valve, the original sampling valve is connected with a production pipeline, and the pressure transmitter is connected between the sleeve valve connecting pipe and the normally closed electric control valve;

the signal output end of the pressure transmitter is connected with a first cable, the signal input end of the intelligent single-loop measurement and control instrument is connected with a second cable, and the first cable is connected with the second cable through a third wiring terminal.

Further, the direct-current power supply, the air switch, the contactor type relay and the intelligent single-loop measurement and control instrument are arranged in a first control cabinet; the normally closed electric control valve and the pressure transmitter are arranged in a second control cabinet, and an observation window for observing data of the pressure transmitter is arranged on the second control cabinet.

furthermore, a branch is arranged between the one-way valve and the original sampling valve and is connected with the sampling valve.

Further, the air switch is a DZ 472P switch.

further, the second connection terminal and the third connection terminal are TB2506 terminals.

Further, the first wiring terminal is a TB2503 terminal.

further, the production pipeline is connected with a production valve, and the production valve is connected with the Christmas tree.

Compared with the prior art, the invention has the following advantages: the invention can set the casing pressure of the oil well and conveniently modify the casing pressure at any time, after the oil well is provided with the numerical control casing pressure control device, the casing pressure of the oil well can be controlled in a more reasonable range in real time, compared with the existing casing pressure control method, the device saves more energy and increases the yield, and can improve the productivity of the oil well; meanwhile, the sampling valve is not connected with a production pipeline any more, but is positioned on a branch between the one-way valve and the original sampling valve, so that the recovery of the sleeve gas is more convenient.

drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a first control cabinet according to the present invention;

In the figure: 1. the system comprises a casing valve, 2, a casing valve connecting pipe, 3, a pressure transmitter, 4, a normally closed electric control valve, 5, a one-way valve, 6, a first cable, 7, a second cable, 8, a production valve, 9, a production pipeline, 10, an original sampling valve, 11, a sampling valve, 12, a first control cabinet, 13, a second control cabinet, 121, a direct current power supply, 122, a DZ 472P switch, 123, a contactor type relay, 124 and an intelligent single-loop measurement and control instrument.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that all directional indications (such as up, down, left, right, front, and back … …) in the embodiments of the present invention are limited to relative positions on a given view, not absolute positions.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Referring to fig. 1 and 2, the numerical control oil well casing pressure control device comprises a direct current power supply 121, a DZ 472P switch 122, a contactor type relay 123, an intelligent single-loop measurement and control instrument 124, a normally closed electric control valve 4 and a pressure transmitter 3;

The direct current power supply 121, the DZ 472P switch 122, the contactor type relay 123 and the intelligent single-loop measurement and control instrument 124 are arranged in the first control cabinet 12, and the control cabinet is a 40 × 50 stainless steel box; the direct-current power supply 121 is connected with a DZ 472P switch 122, the DZ 472P switch 122 is connected with a contactor type relay 123 through a TB2503 terminal, the contactor type relay 123 is connected with an intelligent single-loop measurement and control instrument 124 through a TB2506 terminal, and the intelligent single-loop measurement and control instrument 124 is connected with a normally-closed electric control valve 4; one end of a normally closed electric control valve 4 is connected with a sleeve valve 1 through a sleeve valve connecting pipe 2, the other end of the normally closed electric control valve is connected with an original sampling valve 10 through a one-way valve 5, the original sampling valve 10 is connected with a production pipeline 9, the production pipeline 9 is connected with a production valve 8, and the production valve 8 is connected with a Christmas tree; and a pressure transmitter 3 is connected between the sleeve valve connecting pipe 2 and the normally closed electric control valve 4, the signal output end of the pressure transmitter 3 is connected with a first cable 6, the first cable 6 is connected with a second cable 7 through a TB2506 terminal, and the second cable 7 is connected with the signal input end of the intelligent single-loop measurement and control instrument 124.

the normally closed electric control valve 4 and the pressure transmitter 3 are arranged in a second control cabinet 13, and an observation window for observing data of the pressure transmitter 3 is arranged on the second control cabinet.

In order to facilitate sampling and recovering casing gas, a branch is arranged between the one-way valve 5 and the original sampling valve 10 under the condition of not changing the structure of the original Christmas tree, and the branch is connected with a sampling valve 11.

The working process is as follows: according to the actual working condition of the oil well, after the man-machine interface of the intelligent single-loop measuring and controlling instrument in the first control cabinet inputs the high and low pressure limit values of the casing pressure, the DZ 472P switch is opened, at the moment, the numerical control oil well casing pressure control device starts to operate and monitors the oil well casing pressure in real time, the casing pressure value can be seen on the pressure transmitter and the first control cabinet, when the casing pressure reaches the highest set value, the pressure transmitter transmits data to the intelligent single-loop measuring and controlling instrument, the intelligent single-loop measuring and controlling instrument controls the low-pressure circuit of the normally closed electric control valve to be conducted, the normally closed electric control valve 4 is opened → the oil well gas-liquid in the casing enters → the production pipeline 9 through the casing valve 1 → the casing valve connecting pipe 2 → the normally closed electric control valve 4 → the one-way valve 5 → the original sampling valve 10, and when the casing pressure is reduced to the set low-pressure value, the pressure, the intelligent single-loop measurement and control instrument controls the normally closed electric control valve 4 to be closed, and when the sleeve pressure rises to a high-pressure set value again, the process is continuously repeated.

The change of the casing pressure of the oil well directly affects the sinking degree, the pumping efficiency and the like of the oil well, and further affects the yield of the oil well. Normal production of the oil well can be ensured only by scientifically and reasonably controlling casing pressure.

As far as 6 months in the current year, the numerical control oil well casing pressure control device is experimentally installed on 40 wells of a estuary oil production plant, the current operation working condition is normal, and the feedback application effect of an oil production station is good.

The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention, and the contents of the changes still fall within the scope of the present invention.