Plunger gas lift matching device and using method thereof

Abstract

The invention provides a plunger gas lift matching device and a using method thereof. The plunger gas lift matching device comprises a pressure taking structure, a gas-liquid separation tank, a pressure reducing valve, a gas conveying pipeline, an electromagnetic valve and a pneumatic diaphragm valve. The pressure tapping structure is installed on one side of a gas production tree casing pressure tapping pipeline of the plunger gas lift well, and the gas-liquid separation tank and the pressure reducing valve are both installed on the pressure tapping structure. The pressure tapping structure is connected with a gas production tree casing pressure tapping pipeline; a gas outlet of the pressure taking structure is connected with a gas inlet of the gas-liquid separation tank through a sleeve gas taking port, a gas outlet of the gas-liquid separation tank is connected with a gas inlet of the pressure reducing valve, a gas outlet of the pressure reducing valve is connected with a gas inlet of the electromagnetic valve through a gas conveying pipeline, and a gas outlet of the electromagnetic valve is connected with a gas inlet of the pneumatic diaphragm valve. The pneumatic diaphragm valve air source can be safely conveyed, and technicians can conveniently and rapidly install and operate on site.

Description

Technical Field

[0001] The invention belongs to the field of natural gas exploitation, and in particular relates to a safe and fast installed plunger gas lift matching device and a use method thereof. Background Art

[0002] As one of the three main technologies for drainage and gas production in Changqing Gas Field, plunger gas lift technology has the advantages of high drainage efficiency, long action time, high degree of automation, low cost and green environmental protection. With the continuous development of gas fields, the problem of liquid accumulation in gas wells has become increasingly prominent. In response to different application situations, plunger gas lift technology has been continuously updated in terms of tools and processes, and the number of applied wells has increased year by year.

[0003] The plunger gas lift well uses the casing gas of the well as the gas source. After gas-liquid separation and pressure regulation, it provides power for the pneumatic diaphragm valve to control the opening and closing of the pneumatic diaphragm valve, thereby controlling the opening and closing of the plunger gas lift well. At the same time, each plunger gas lift well is equipped with a plunger controller, which allows technicians to read gas well data on site, modify the working mode of the gas well, adjust the plunger optimization mode, and perform other operations. When the plunger controller issues a well opening command, the solenoid valve in the pneumatic diaphragm valve opens, connecting the gas supply channel, and the casing gas pushes the pneumatic diaphragm valve to open, realizing the opening of the plunger gas lift well; when the plunger controller issues a well closing command, the solenoid valve closes, the gas supply channel is disconnected, the diaphragm valve closes, and the plunger gas lift well is closed.

[0004] According to the current installation of the wellhead device of the plunger gas lift well, the installation position of the plunger controller 4 and the gas extraction position of the casing gas are located on the side of the valve 6# of the gas tree, that is, on the side of the casing pressure extraction pipeline of the gas tree, and the installation position of the gas-liquid separation tank 2, the pressure reducing valve 3, and the pneumatic membrane valve 1 of the casing gas are located on the side of the double-tube production process of the gas tree of the plunger gas lift well, as shown in the attached figure. Figure 1 As shown. There are two problems with this design: first, the casing gas is high-pressure gas. The gas is transported from the gas extraction position to the pressure reducing valve 3 position. The pipelines are all high-pressure pipelines, passing through the entire gas tree, and are in an exposed state, which poses a risk of high-pressure gas leakage; second, the height of the gas tree is generally above 1.5m, and the installation positions of the gas-liquid separation tank 2, pressure reducing valve 3 and other components are too high. When installing and operating, the operator needs to climb the gas tree, which makes the operation process cumbersome and there is a risk of the operator falling from a height. Summary of the invention

[0005] The object of the present invention is to provide a plunger gas lift supporting device and a method of using the same, so as to overcome the above-mentioned technical defects, realize the safe delivery of gas source for the pneumatic diaphragm valve, and facilitate rapid on-site installation and operation by technicians.

[0006] The present invention is achieved through the following technical solutions:

[0007] A plunger gas lift supporting device, comprising: a pressure taking structure, a gas-liquid separation tank, a pressure reducing valve, a gas transmission pipeline, a solenoid valve and a pneumatic diaphragm valve;

[0008] The pressure taking structure is installed on one side of the gas tree casing pressure taking pipeline of the plunger gas lift well, and the gas-liquid separation tank and the pressure reducing valve are both installed on the pressure taking structure; the pressure taking structure is connected to the gas tree casing pressure taking pipeline;

[0009] The air outlet of the pressure-taking structure is connected to the air inlet of the gas-liquid separation tank through the casing gas intake port, the air outlet of the gas-liquid separation tank is connected to the air inlet of the pressure reducing valve, the air outlet of the pressure reducing valve is connected to the air inlet of the solenoid valve through the gas pipeline, and the air outlet of the solenoid valve is connected to the air inlet of the pneumatic diaphragm valve.

[0010] Preferably, the solenoid valve and the pneumatic diaphragm valve are installed on one side of the double-tube production process of the gas tree of the plunger gas lift well.

[0011] Preferably, the pressure taking structure is a pressure taking flange.

[0012] Preferably, the gas pipeline is a low-pressure gas pipeline.

[0013] Furthermore, the pressure range of the low-pressure gas transmission pipeline is 0.1-0.2MPa.

[0014] Preferably, a plunger controller is also included, and the plunger controller is used to control the opening and closing of the solenoid valve.

[0015] Furthermore, the plunger controller is installed on the pressure taking structure.

[0016] Preferably, a vent for discharging liquid is provided at the lower end of the gas-liquid separation tank.

[0017] Preferably, the gas pressure at the gas outlet of the pressure reducing valve is 25-35 psi.

[0018] The method for using the plunger gas lift supporting device comprises:

[0019] Open the solenoid valve, and the casing gas enters the gas-liquid separation tank from the pressure-taking structure through the casing gas intake port; the casing gas is separated into gas and liquid in the gas-liquid separation tank, and the separated gas enters the pressure reducing valve to reduce the pressure to the safety pressure of the pneumatic diaphragm valve, and then is transported to the solenoid valve to push open the valve seat of the pneumatic diaphragm valve, and the plunger gas lift well is opened;

[0020] Close the solenoid valve, the pneumatic diaphragm valve seat is seated, and the plunger air lift well is closed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a safe and fast installation plunger gas lift supporting device. After the installation positions of the gas-liquid separation tank and the pressure reducing valve are adjusted to the vicinity of the casing gas extraction position, on the one hand, the casing gas realizes gas-liquid separation and pressure reduction at the extraction position, and the casing gas delivered to the pneumatic diaphragm valve is low-pressure casing gas, which reduces the risk of high-pressure gas delivery; on the other hand, the height of the component installation position is reduced, and technicians do not need to perform high-altitude operations, making installation and operation more convenient. This increases the safety and operability of the plunger gas lift technology, and is more conducive to the promotion and application of the plunger gas lift technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the wellhead installation of the current gas well plunger gas lift supporting device.

[0024] Figure 2 It is a schematic diagram of the wellhead installation of the gas well plunger gas lift matching device of the present invention.

[0025] Figure 3 It is a partial schematic diagram of a plunger controller of a gas well plunger gas lift matching device of the present invention.

[0026] Figure 4 It is a partial schematic diagram of the pressure flange of the gas well plunger gas lift matching device of the present invention; (a) front view, (b) cross-sectional view.

[0027] Figure 5 It is a partial schematic diagram of the pneumatic diaphragm valve and the solenoid valve of the gas well plunger gas lift supporting device of the present invention.

[0028] Description of reference numerals:

[0029] 1 is a pneumatic diaphragm valve; 2 is a gas-liquid separation tank; 3 is a pressure reducing valve; 4 is a plunger controller; 5 is a pressure taking flange; 6 is a casing gas intake port; 7 is a gas transmission pipeline; 8 is a solenoid valve; 9 is a 6# valve. DETAILED DESCRIPTION

[0030] In order to make the above contents of the present invention more clearly understood, the following is a detailed description of the preferred embodiments in conjunction with the accompanying drawings. Figures 2 to 5 , introduces exemplary embodiments of the present invention, however, the present invention can be implemented in many different forms and is not limited to the embodiments described herein, these embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention.

[0031] It should be noted that in the present invention, the upper, lower, left and right in the figure are regarded as the upper, lower, left and right of the safe and quick installation plunger gas lift supporting device described in this specification. In the drawings, the same units / elements are marked with the same reference numerals.

[0032] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0033] refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The safe and fast installed plunger gas lift supporting device of the present invention comprises: a gas tree, a pressure flange 5, a gas-liquid separation tank 2, a pressure reducing valve 3, a gas transmission pipeline 7, a solenoid valve 8, a pneumatic diaphragm valve 1 and a plunger controller 4.

[0034] The pressure flange 5 is installed on the side of the 6# valve 9 of the gas tree of the plunger gas lift well, that is, on the side of the casing pressure taking pipeline of the gas tree, and the gas-liquid separation tank 2, the pressure reducing valve 3 and the plunger controller 4 are all installed on the pressure flange 5. That is, the pressure flange 5 is installed on the pipeline after the 6# valve 9, and the casing gas enters the connection of the pressure flange 5 through the 6# valve 9.

[0035] The pressure-taking flange 5 is connected to the casing pressure-taking pipeline of the gas production tree. The air outlet of the pressure-taking flange 5 is connected to the casing gas air outlet 6, and the gas-liquid separation tank 2 is installed near the casing gas air outlet 6; the lower end of the gas-liquid separation tank 2 is provided with a vent, and the upper end is provided with an air inlet and an air outlet; the air inlet of the gas-liquid separation tank 2 is connected to the air outlet of the casing gas air outlet 6, and the air outlet of the gas-liquid separation tank 2 is connected to the air inlet of the pressure reducing valve 3. The casing gas in the plunger well enters the casing gas air outlet 6 through the pressure-taking flange 5, and then enters the tank body from the casing gas inlet at the upper part of the gas-liquid separation tank 2. The casing gas is separated into gas and liquid in the gas-liquid separation tank 2, and the gas portion obtained after the gas-liquid separation enters the pressure reducing valve 3, and the liquid portion is deposited at the lower part of the gas-liquid separation tank 2 and discharged through the vent of the gas-liquid separation tank 2.

[0036] The pressure reducing valve 3 is installed above the gas-liquid separation tank 2, and the gas outlet of the pressure reducing valve 3 is connected to the gas inlet of the solenoid valve 8 through the gas pipeline 7, and the gas outlet of the solenoid valve 8 is connected to the gas inlet of the pneumatic membrane valve 1. The pressure reducing valve 3 is used to reduce the high-pressure casing gas to low-pressure casing gas, that is, to reduce the gas pressure to the safety pressure of the pneumatic membrane valve, preferably 25-35psi.

[0037] The gas pipeline 7 is a low-pressure gas pipeline with a pressure bearing capacity of 0.1-0.2MPa, and is used to transport the low-pressure casing gas coming out of the pressure reducing valve 3 to the solenoid valve 8; the solenoid valve 8 and the pneumatic diaphragm valve 1 are installed on one side of the double-tube production process of the plunger gas lift well gas tree, and are used to respond to the well opening and closing instructions of the plunger controller 4 to perform well opening and closing operations.

[0038] This embodiment relates to a method for using a plunger gas lift accessory device that is safe and quick to install, including the following stages:

[0039] S001, install the pressure flange 5 on one side of the valve #6 of the gas tree of the plunger gas lift well;

[0040] S002, install the plunger controller 4, the casing gas outlet 6, the gas-liquid separation tank 2 and the pressure reducing valve 3 on the pressure flange 5, install the solenoid valve 8 and the pneumatic membrane valve 1 on the double-tube production process side of the plunger gas lift well gas tree, and connect the outlet of the pressure reducing valve 3 and the inlet of the solenoid valve 8 with the low-pressure gas pipeline 7;

[0041] S003, obtaining casing gas from casing gas inlet 6;

[0042] S004, the taken-out casing gas enters the tank body from the upper part of the gas-liquid separation tank 2 to perform gas-liquid separation;

[0043] S005, after the casing gas is separated from the liquid, the gas enters the pressure reducing valve 3 and is reduced to the safety pressure of the pneumatic diaphragm valve 1, and the liquid is deposited at the bottom of the tank;

[0044] S006, after the plunger controller 4 issues a well opening command, the solenoid valve 8 opens, and the casing gas after gas-liquid separation and decompression is transported to the solenoid valve 8 through the low-pressure pipeline 7, pushing the valve seat of the pneumatic membrane valve 1 open, and the plunger gas lift well is opened;

[0045] S007, after the plunger controller 4 issues a well-closing command, the solenoid valve 8 is closed. Since there is no gas supply, the valve seat of the pneumatic diaphragm valve 1 is seated, and the plunger gas lift well is closed.

[0046] The pressure reducing valve 3 of the present invention is located on one side of the valve # 6 of the gas production tree. The pressure reducing valve 3 is connected to the solenoid valve 8 through a low-pressure gas transmission pipeline 7, and the low-pressure casing gas is transmitted to the pneumatic diaphragm valve 1, so as to realize the switching of the plunger gas lift well, reduce the risk of high-pressure gas transmission, facilitate the installation and operation of the device, increase the safety and operability of the plunger gas lift technology, and contribute to the further promotion and application of the plunger gas lift technology.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A plunger gas lift supporting device, characterized in that: include: A pressure taking structure, a gas-liquid separation tank (2), a pressure reducing valve (3), a gas transmission pipeline (7), a solenoid valve (8) and a pneumatic diaphragm valve (1); The pressure taking structure is installed on one side of the gas tree casing pressure taking pipeline of the plunger gas lift well, and the gas-liquid separation tank (2) and the pressure reducing valve (3) are both installed on the pressure taking structure; the pressure taking structure is connected to the gas tree casing pressure taking pipeline; The air outlet of the pressure-taking structure is connected to the air inlet of the gas-liquid separation tank (2) through the casing gas air intake port (6), the air outlet of the gas-liquid separation tank (2) is connected to the air inlet of the pressure reducing valve (3), the air outlet of the pressure reducing valve (3) is connected to the air inlet of the solenoid valve (8) through the gas transmission pipeline (7), and the air outlet of the solenoid valve (8) is connected to the air inlet of the pneumatic membrane valve (1).

2. The plunger gas lift device according to claim 1, characterized in that: The solenoid valve (8) and the pneumatic membrane valve (1) are installed on one side of the double-tube production process of the gas tree of the plunger gas lift well.

3. The plunger gas lift supporting device according to claim 1, characterized in that: The pressure taking structure is a pressure taking flange (5).

4. The plunger gas lift supporting device according to claim 1, characterized in that: The gas transmission pipeline (7) is a low-pressure gas transmission pipeline.

5. The plunger gas lift supporting device according to claim 4, characterized in that: The pressure range of the low-pressure gas transmission pipeline is 0.1-0.2MPa.

6. The plunger gas lift supporting device according to claim 1, characterized in that: It also includes a plunger controller (4), which is used to control the opening and closing of the solenoid valve (8).

7. The plunger gas lift device according to claim 6, characterized in that: The plunger controller (4) is installed on the pressure taking structure.

8. The plunger gas lift device according to claim 1, characterized in that: The lower end of the gas-liquid separation tank (2) is provided with a vent for discharging liquid.

9. The plunger gas lift device according to claim 1, characterized in that: The gas pressure at the outlet of the pressure reducing valve (3) is 25-35 psi.

10. The method for using the plunger gas lift supporting device according to claim 1, characterized in that: include: Open the solenoid valve, and the casing gas enters the gas-liquid separation tank from the pressure-taking structure through the casing gas intake port; The casing gas is separated into gas and liquid in the gas-liquid separation tank, and the separated gas enters the pressure reducing valve to reduce the pressure to the safety pressure of the pneumatic diaphragm valve, and then is transported to the solenoid valve to push open the valve seat of the pneumatic diaphragm valve, and the plunger gas lift well is opened; Close the solenoid valve, the pneumatic diaphragm valve seat is seated, and the plunger air lift well is closed.

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