Intermittent liquid drainage, gathering and transportation device and process for moisture

Abstract

The invention discloses a wet gas intermittent liquid drainage gathering and transportation device and technology, and relates to the technical field of natural gas gathering and transportation, in particular to the wet gas intermittent liquid drainage gathering and transportation device which comprises a natural gas well gas production tree and a gas gathering master station and further comprises a wellhead incoming flow pipe, a gas conveying pipe, a liquid conveying pipe, a gas-liquid mixed conveying pipe, a gas injection pipe, a liquid injection pipe, a gas-liquid separator, a liquid preparation cylinder and a liquid storage tank. The gas-liquid separator is used for carrying out gas-liquid separation on the liquid-containing raw material gas, and the produced gas phase is conveyed to the gas collection master station through the gas conveying pipe and the gas-liquid mixed conveying pipe; when the liquid storage tank is used for pre-storing and discharging the produced liquid phase, the gas transmission is firstly suspended, the liquid in the liquid storage tank is conveyed into the liquid preparation cylinder through the liquid conveying pump to form the liquid plug, the gas injection pipe is opened, the gas transmission is started, the liquid plug is pushed by the gas phase to move to the gas collection master station, and the liquid plug is further treated by the gas collection master station; therefore, the purposes of gas-liquid separation and intermittent liquid drainage, gathering and transportation of the liquid-containing natural gas are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas gathering and transportation, and specifically relates to a wet gas intermittent liquid drainage gathering and transportation device and process. Background Art

[0002] During gas field production, the produced gas at the wellhead usually contains a certain amount of liquid. The common natural gas gathering and transportation processes are divided into two types: gas-liquid mixed transportation and gas-liquid separate transportation. Please refer to the appendix Figure 2 , the so-called gas-liquid mixed transportation means that the raw gas is metered by a meter after separation at the well site, and then the gas and liquid are remixed and transported, and then transported to the gas gathering station through the gathering and transportation pipeline network for further processing. Please refer to Figure 3 , gas-liquid separate transportation is to set up a gas-liquid separator at the well site. After the gas and liquid are separated, they are transported to the gas gathering station through their respective pipelines.

[0003] For the gas-liquid mixed transportation mode, as the liquid enters the gathering and transportation pipeline, liquid accumulation will occur in the pipeline. The existence of liquid accumulation will reduce the effective transportation area of the pipeline, resulting in increased resistance, causing pressure fluctuations, and in addition, it will also accelerate the corrosion of the pipeline. For the gas-liquid separate transportation mode, it is necessary to lay separate liquid transportation pipelines and gas transportation pipelines, resulting in a huge overall investment cost. Summary of the Invention

[0004] (I) Technical Problems to be Solved In view of the deficiencies of the prior art, the present invention provides a wet gas intermittent liquid drainage gathering and transportation device and process, which solves the problems raised in the above background art.

[0005] (II) Technical Solutions To achieve the above object, the present invention is realized through the following technical solutions: A wet gas intermittent liquid drainage gathering and transportation device includes a gas production tree for a natural gas well, a gas gathering station, and also includes an inlet flow pipe for the wellhead, a gas transmission pipe, a liquid transmission pipe, a gas-liquid mixed transmission pipe, an injection gas pipe, an injection liquid pipe, a gas-liquid separator, a liquid distribution cylinder, and a liquid storage tank; The inflow end of the inlet flow pipe for the wellhead is fixedly installed and communicated with the gas production tree of the natural gas well, and the outflow end of the inlet flow pipe for the wellhead is fixedly installed and communicated with the medium inflow end of the gas-liquid separator; the liquid-phase inflow end of the liquid transmission pipe is fixedly installed and communicated with the liquid-phase outflow end of the gas-liquid separator, the liquid-phase outflow end of the liquid transmission pipe is fixedly installed and communicated with the liquid-phase inflow end of the liquid storage tank, the liquid-phase inflow end of the injection liquid pipe is fixedly installed and communicated with the liquid-phase outflow end of the liquid storage tank, and the liquid-phase outflow end of the injection liquid pipe is communicated with the middle section of the liquid distribution cylinder; The inlet end of the gas-liquid mixed transportation pipe is fixedly installed and communicated with the outlet end of the liquid distribution cylinder, and the outlet end of the gas-liquid mixed transportation pipe is communicated with the main gas gathering station; the gas-phase inlet end of the gas transportation pipe is fixedly installed and communicated with the gas-phase outlet end of the gas-liquid separator, one gas-phase outlet end of the gas transportation pipe is communicated with the middle section of the gas-liquid mixed transportation pipe, the other gas-phase outlet end of the gas transportation pipe is fixedly installed and communicated with the inlet end of the gas injection pipe, and the outlet end of the gas injection pipe is fixedly installed and communicated with the inlet end of the liquid distribution cylinder.

[0006] Optionally, an overflow pipe is further included. The inlet end of the overflow pipe is fixedly installed and communicated with the top of the middle section of the liquid distribution cylinder, and the outlet end of the overflow pipe is communicated with the inside of the liquid storage tank; a sixth shut-off valve is installed on the overflow pipe.

[0007] Optionally, a medicine transportation component is further included. The medicine transportation component includes a medicine pipe, a medicine pump, a medicine tank, and a fifth shut-off valve. The outlet end of the medicine pipe is fixedly installed and communicated with the middle section of the liquid distribution cylinder, the inlet end of the medicine pipe is fixedly installed and communicated with the medicine tank, the medicine pump is installed at the end of the inlet end of the medicine pipe, and the fifth shut-off valve is installed at the end of the outlet end of the medicine pipe.

[0008] Optionally, a gas flow meter is installed at the end of the inlet end of the gas transportation pipe, and a first shut-off valve is installed at the end of the gas transportation pipe near one end of the gas-liquid mixed transportation pipe; a second shut-off valve is installed on the gas injection pipe, a liquid flow meter and a fourth shut-off valve are respectively installed on the liquid transportation pipe, and a third shut-off valve and a liquid infusion pump are respectively installed on the liquid injection pipe.

[0009] Optionally, a front isolation pig is installed inside the inlet end of the liquid distribution cylinder, a rear isolation pig is installed inside the outlet end of the liquid distribution cylinder, a flexible steel member is bound to the tail end of the front isolation pig, and one end of the flexible steel member away from the front isolation pig is bound to the head end of the rear isolation pig.

[0010] A wet gas intermittent liquid drainage gathering and transportation process includes the following steps: A. Normal gas exhaust: Open the first shut-off valve and the fourth shut-off valve, and close the second shut-off valve, the third shut-off valve, the fifth shut-off valve, and the sixth shut-off valve; the gas-liquid mixed phase produced at the wellhead flows through the wellhead incoming flow pipe and enters the gas-liquid separator. The gas-liquid separator separates the gas-liquid mixed phase into a gas phase and a liquid phase. The gas phase sequentially flows through the gas transportation pipe and the gas-liquid mixed transportation pipe and enters the main gas gathering station, and the liquid phase flows through the liquid transportation pipe and enters the liquid storage tank. B. Intermittent liquid drainage: Place the rear isolation pig inside the liquid distribution cylinder near one end of the gas-liquid mixed transportation pipeline, place the front isolation pig inside the liquid distribution cylinder near one end of the gas transportation pipe, and bind the front isolation pig and the rear isolation pig with a flexible steel member. The front isolation pig and the rear isolation pig isolate a liquid storage cavity inside the liquid distribution cylinder. Open the third shut-off valve on the liquid injection pipe, start the infusion pump, and inject the liquid in the liquid storage tank into the liquid storage cavity inside the liquid mixing cylinder; at the same time, open the fifth shut-off valve on the chemical agent pipe, start the chemical agent pump, and the chemical agent pump injects the corrosion inhibitor in the chemical agent tank into the liquid storage cavity; the front isolation pig, the liquid at the liquid storage cavity, and the rear isolation pig form a liquid plug. When it is observed that there is a liquid flow in the overflow pipe, it indicates that the liquid storage cavity is full of liquid. At this time, first close the third shut-off valve and the fifth shut-off valve, stop the infusion pump and the chemical agent pump, and then close the sixth shut-off valve. Open the second shut-off valve and close the first shut-off valve. The gas phase separated by the gas-liquid separator flows through the gas transmission pipe, the gas injection pipe, and the gas-liquid mixed transmission pipe in sequence and enters the main gas gathering station; during the flow of this gas phase, the gas phase pushes the liquid plug to move. The liquid plug moves through the gas-liquid mixed transmission pipe, and the liquid plug is taken out at the main gas gathering station.

[0011] (III) Beneficial effects The present invention provides a wet gas intermittent liquid drainage gathering and transportation device and process, which has the following beneficial effects: 1. The wet gas intermittent liquid drainage gathering and transportation device and process, through the coordinated setting of the wellhead incoming flow pipe, the gas transmission pipe, the liquid infusion pipe, the gas-liquid mixed transmission pipe, the gas injection pipe, the liquid injection pipe, the gas-liquid separator, the liquid mixing cylinder, and the liquid storage tank, enables the wet gas intermittent liquid drainage gathering and transportation device and process to have the effects of gas-liquid separation and intermittent liquid drainage for the raw gas produced in the gas field. The gas-liquid separator separates the liquid-containing raw gas into gas and liquid, and the produced gas phase is transported to the main gas gathering station through the gas transmission pipe and the gas-liquid mixed transmission pipe; the liquid storage tank is used to pre-store the produced liquid phase. During liquid drainage, the gas transmission is first paused, and the liquid in the liquid storage tank is transported into the liquid mixing cylinder by the infusion pump to form a liquid plug. Then the gas injection pipe is opened and the gas transmission starts. The gas phase pushes the liquid plug to move to the main gas gathering station, and the main gas gathering station further processes the liquid plug, so as to achieve the purpose of gas-liquid separation, intermittent liquid drainage gathering and transportation of the liquid-containing natural gas. Compared with the prior art, it can effectively reduce the liquid accumulation in the pipeline during gas transmission, avoid the pressure fluctuation during the gas flow process, and reduce the pipeline profile; avoid laying the liquid drainage pipeline and reduce the investment cost.

[0012] 2. The present invention makes full use of the advantages of wet gas mixed transportation and wet gas separate transportation, and proposes a new type of gathering and transportation device and process different from the traditional gas-liquid separate transportation and gas-liquid mixed transportation. Its principle is to set a gas-liquid separator at the natural gas station to pre-separate the liquid-containing raw gas from the wellhead. The separated free liquid is pre-stored through the liquid storage tank. When the liquid storage tank reaches a certain load, the liquid in the liquid storage tank is injected into the liquid mixing cylinder for centralized liquid drainage. During the liquid drainage process, a corrosion inhibitor is added to the liquid phase to prevent pipeline corrosion; at the same time, the liquid plug can push and sweep to remove the liquid accumulation in the gas-liquid mixed transmission pipe during the moving process. Description of the drawings

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained according to the provided drawings.

[0014] Figure 1 Schematic diagram of the pipeline connection structure of a wet gas intermittent drainage gathering and transportation device of the present invention; Figure 2 Schematic diagram of the pipeline connection structure during gas-liquid mixed transportation of natural gas; Figure 3 Schematic diagram of the pipeline connection structure during gas-liquid separate transportation of natural gas.

[0015] In the figure: 1, wellhead incoming flow pipe; 2, gas-liquid separator; 3, gas transmission pipe; 4, liquid transmission pipe; 5, gas flowmeter; 6, liquid flowmeter; 7, gas-liquid mixed transportation pipe; 8, gas gathering main station; 9, liquid distribution cylinder; 10, liquid storage tank; 11, chemical agent tank; 12, chemical agent pump; 13, liquid transmission pump; 14, overflow pipe; 15, front isolation pig; 16, rear isolation pig; 17, gas injection pipe; 18, liquid injection pipe; 19, chemical agent pipe; 20, first shut-off valve; 21, second shut-off valve; 22, third shut-off valve; 23, fourth shut-off valve; 24, fifth shut-off valve; 25, sixth shut-off valve. Detailed implementation manners

[0016] The following will clearly and completely describe the technical solutions of the present invention with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying.

[0017] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Please refer to Figure 1 Figure 1 , the present invention provides a technical solution: a wet gas intermittent liquid drainage gathering and transportation device, including a natural gas well gas production tree and a gas gathering main station 8. A wet gas intermittent liquid drainage gathering and transportation device further includes a wellhead incoming flow pipe 1, a gas transmission pipe 3, a liquid transmission pipe 4, a gas-liquid mixed transmission pipe 7, an injection gas pipe 17, an injection liquid pipe 18, a gas-liquid separator 2, a liquid distribution cylinder 9, and a liquid storage tank 10.

[0019] Among them, the wellhead incoming flow pipe 1 is used to transport liquid-containing raw gas, that is, to transport liquid-containing natural gas. The gas transmission pipe 3 is used to transport the separated gas phase (that is, natural gas). The liquid transmission pipe 4 is used to transport the liquid phase, that is, to transport the liquid separated from the raw natural gas. The gas-liquid mixed transmission pipe 7 is used to transport the liquid or gas at the station to the gas gathering main station 8. The injection gas pipe 17 is used to introduce the gas in the gas transmission pipe 3 into the liquid distribution cylinder 9. The injection liquid pipe 18 is used to introduce the liquid in the liquid storage tank 10 into the liquid distribution cylinder 9. The gas-liquid separator 2 is used to separate the gas and liquid of the liquid-containing raw natural gas. The liquid storage tank 10 is used to store the liquid. The liquid distribution cylinder 9 includes, but is not limited to, a pig launcher barrel. The liquid distribution cylinder 9 is a cylindrical structure as a whole, and control valves are installed at both the gas inlet end and the exhaust end of the liquid distribution cylinder 9.

[0020] The inflow end of the wellhead incoming flow pipe 1 is fixedly installed with the natural gas well gas production tree (this fixed installation means that the two are fixedly fitted together, and the fixed installation methods include threaded connection, welding, valve movable connection, etc.) and the two are connected. The outflow end of the wellhead incoming flow pipe 1 is fixedly installed with the medium inflow end of the gas-liquid separator 2 and the two are connected. The liquid phase inflow end of the liquid transmission pipe 4 is fixedly installed with the liquid phase outflow end of the gas-liquid separator 2 and the two are connected. The liquid phase outflow end of the liquid transmission pipe 4 is fixedly installed with the liquid phase inflow end of the liquid storage tank 10 and the two are connected. The liquid phase inflow end of the injection liquid pipe 18 is fixedly installed with the liquid phase outflow end of the liquid storage tank 10 and the two are connected. The liquid phase outflow end of the injection liquid pipe 18 is connected to the middle section of the liquid distribution cylinder 9.

[0021] The inflow end of the gas-liquid mixed transmission pipe 7 is fixedly installed with the outflow end of the liquid distribution cylinder 9 and the two are connected. The outflow end of the gas-liquid mixed transmission pipe 7 is connected to the gas gathering main station 8. The gas phase inflow end of the gas transmission pipe 3 is fixedly installed with the gas phase outflow end of the gas-liquid separator 2 and the two are connected. One gas phase outflow end of the gas transmission pipe 3 is connected to the middle section (referring to the middle area of the gas-liquid mixed transmission pipe 7 except the ends or the ends) of the gas-liquid mixed transmission pipe 7. The other gas phase outflow end of the gas transmission pipe 3 is fixedly installed with the inflow end of the injection gas pipe 17 and the two are connected. The outflow end of the injection gas pipe 17 is fixedly installed with the inflow end of the liquid distribution cylinder 9 and the two are connected.

[0022] Among them, the connection method between the above two components adopts fixed installation, which generally refers to the cooperation and fixation of two components together. The fixed installation methods include threaded connection, welding, valve movable connection, etc., to meet the implementation needs of actual working conditions.

[0023] Specifically, a wet gas intermittent liquid drainage gathering and transportation device further includes an overflow pipe 14. The inflow end of the overflow pipe 14 is fixedly installed and communicated with the top of the middle section of the liquid distribution cylinder 9, and the outflow end of the overflow pipe 14 is communicated with the inside of the liquid storage tank 10. A sixth shut-off valve 25 is installed on the overflow pipe 14.

[0024] Among them, the overflow pipe 14 is used to conveniently observe whether the liquid in the liquid distribution cylinder 9 is full. When the liquid in the liquid distribution cylinder 9 is full or overflows, the liquid flows into the overflow pipe 14. The overflow pipe 14 includes but is not limited to using a transparent pipe body. The sixth shut-off valve 25 is used to control the on-off of the overflow pipe 14.

[0025] Specifically, a wet gas intermittent liquid drainage gathering and transportation device further includes a medicine delivery component. The medicine delivery component includes a medicine pipe 19, a medicine pump 12, a medicine tank 11, and a fifth shut-off valve 24. The outflow end of the medicine pipe 19 is fixedly installed and communicated with the middle section of the liquid distribution cylinder 9, the inflow end of the medicine pipe 19 is fixedly installed and communicated with the medicine tank 11, the medicine pump 12 is installed at the end of the inflow end of the medicine pipe 19, and the fifth shut-off valve 24 is installed at the end of the outflow end of the medicine pipe 19.

[0026] Among them, the medicine tank 11 contains liquid medicine inside. The medicine delivery component is used to deliver the liquid medicine into the liquid distribution cylinder 9. This liquid medicine includes but is not limited to using corrosion inhibitors. The medicine pump 12 includes but is not limited to using a water pump, a positive displacement pump, etc. The fifth shut-off valve 24 is used to control the on-off of the medicine pipe 19. After the medicine pump 12 is started, it extracts the liquid medicine in the medicine tank 11 and delivers the liquid medicine into the liquid distribution cylinder 9.

[0027] Specifically, a gas flowmeter 5 is installed at the end of the inflow end of the gas transmission pipe 3. The gas flowmeter 5 is used to measure the flow rate of the gas flowing through the gas transmission pipe 3. A first shut-off valve 20 is installed at the end of the gas transmission pipe 3 near one end of the gas-liquid mixed transmission pipe 7. The first shut-off valve 20 is used to control the on-off of the gas transmission pipe 3. A second shut-off valve 21 is installed on the injection gas pipe 17. The second shut-off valve 21 is used to control the on-off of the injection gas pipe 17. A liquid flowmeter 6 and a fourth shut-off valve 23 are respectively installed on the liquid transmission pipe 4. The fourth shut-off valve 23 is used to control the on-off of the liquid transmission pipe 4. A third shut-off valve 22 and an infusion pump 13 are respectively installed on the injection liquid pipe 18. The third shut-off valve 22 is used to control the on-off of the injection liquid pipe 18, and the infusion pump 13 is used to extract the liquid in the liquid storage tank 10.

[0028] Specifically, a front isolation pig 15 is installed inside the inflow end of the liquid distribution cylinder 9, and a rear isolation pig 16 is installed inside the outflow end of the liquid distribution cylinder 9. A flexible steel member is bound to the tail end of the front isolation pig 15, and the end of the flexible steel member away from the front isolation pig 15 is bound to the head end of the rear isolation pig 16. The flexible steel member is one of a steel wire rope and a chain.

[0029] Among them, the front isolation pig 15 and the rear isolation pig 16 include, but are not limited to, polyurethane foam pigs, mechanical pigs, isolation pigs, etc. A sealing gasket is sleeved on the outer periphery of the front isolation pig 15 (or the rear isolation pig 16) to strengthen the sealing effect between the outer periphery of the front isolation pig 15 (or the rear isolation pig 16) and the inner side wall of the liquid distribution cylinder 9.

[0030] A wet gas intermittent drainage gathering and transportation process includes the following steps: A. Normal exhaust: Open the first shut-off valve 20 and the fourth shut-off valve 23, and close the second shut-off valve 21, the third shut-off valve 22, the fifth shut-off valve 24, and the sixth shut-off valve 25. The gas-liquid mixture produced at the wellhead flows through the wellhead incoming flow pipe 1 and enters the gas-liquid separator 2. The gas-liquid separator 2 separates the gas-liquid mixture into a gas phase and a liquid phase. The gas phase sequentially flows through the gas transmission pipe 3 and the gas-liquid mixed transmission pipe 7 and enters the gas gathering main station 8, and the liquid phase flows through the liquid transmission pipe 4 and enters the liquid storage tank 10.

[0031] Among them, the liquid storage tank 10 pre-stores the liquid phase. After the liquid storage tank 10 receives a certain amount of liquid, intermittent drainage is carried out through step B.

[0032] B. Intermittent drainage: Step 1: Place the rear isolation pig 16 inside the liquid distribution cylinder 9 near one end of the gas-liquid mixed transmission pipeline 7, and place the front isolation pig 15 inside the liquid distribution cylinder 9 near one end of the gas transmission pipe 3. The front isolation pig 15 and the rear isolation pig 16 are bound by a flexible steel member, and the front isolation pig 15 and the rear isolation pig 16 isolate a liquid storage cavity inside the liquid distribution cylinder 9.

[0033] Step 2: Open the third shut-off valve 22 on the liquid injection pipe 18, start the liquid delivery pump 13, and inject the liquid in the liquid storage tank 10 into the liquid storage cavity inside the liquid distribution cylinder 9. At the same time, open the fifth shut-off valve 24 on the chemical agent pipe 19, start the chemical agent pump 12, and the chemical agent pump 12 injects the corrosion inhibitor in the chemical agent tank 11 into the liquid storage cavity. The front isolation pig 15, the liquid at the liquid storage cavity, and the rear isolation pig 16 form a liquid plug.

[0034] Step 3: When it is observed that there is a liquid flow in the overflow pipe 14, it means that the liquid storage cavity is full of liquid. At this time, first close the third shut-off valve 22 and the fifth shut-off valve 24, stop the liquid delivery pump 13 and the chemical agent pump 12, and then close the sixth shut-off valve 25.

[0035] Step 4: Open the second shut-off valve 21 and close the first shut-off valve 20. The gas phase separated by the gas-liquid separator 2 sequentially flows through the gas transmission pipe 3, the gas injection pipe 17, and the gas-liquid mixed transmission pipe 7 and enters the main gas gathering station 8. During the flow of this gas phase, the gas phase pushes the liquid plug to move. The liquid plug moves through the gas-liquid mixed transmission pipe 7 and is removed at the main gas gathering station 8 (a pig receiver is provided at the main gas gathering station 8 for receiving the liquid plug), thereby achieving the purpose of liquid drainage.

[0036] Note: Regarding the necessity of transporting the separated liquid to the main gas gathering station 8, directly discharging the liquid near the natural gas station will cause pollution near the natural gas station and affect the normal operation and production safety of the natural gas station. Therefore, it is necessary to transport the liquid to the main gas gathering station 8 for centralized treatment.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A wet gas intermittent liquid drainage gathering and transportation device, comprising a gas production tree for a natural gas well and a central gas gathering station (8), characterized in that: It also includes an inlet pipe (1) at the wellhead, a gas transmission pipe (3), a liquid transmission pipe (4), a gas-liquid mixed transmission pipe (7), an injection gas pipe (17), an injection liquid pipe (18), a gas-liquid separator (2), a liquid mixing cylinder (9), and a liquid storage tank (10); The inlet end of the inlet pipe (1) at the wellhead is fixedly installed and communicated with the gas production tree of the natural gas well. The outlet end of the inlet pipe (1) at the wellhead is fixedly installed and communicated with the medium inlet end of the gas-liquid separator (2); the liquid inlet end of the liquid transmission pipe (4) is fixedly installed and communicated with the liquid outlet end of the gas-liquid separator (2). The liquid outlet end of the liquid transmission pipe (4) is fixedly installed and communicated with the liquid inlet end of the liquid storage tank (10). The liquid inlet end of the injection liquid pipe (18) is fixedly installed and communicated with the liquid outlet end of the liquid storage tank (10). The liquid outlet end of the injection liquid pipe (18) is communicated with the middle section of the liquid mixing cylinder (9); The inlet end of the gas-liquid mixed transmission pipe (7) is fixedly installed and communicated with the outlet end of the liquid mixing cylinder (9). The outlet end of the gas-liquid mixed transmission pipe (7) is communicated with the main gas gathering station (8); the gas inlet end of the gas transmission pipe (3) is fixedly installed and communicated with the gas outlet end of the gas-liquid separator (2). One gas outlet end of the gas transmission pipe (3) is fixedly installed and communicated with the middle section of the gas-liquid mixed transmission pipe (7). The other gas outlet end of the gas transmission pipe (3) is fixedly installed and communicated with the inlet end of the injection gas pipe (17). The outlet end of the injection gas pipe (17) is fixedly installed and communicated with the inlet end of the liquid mixing cylinder (9).

2. The wet gas intermittent liquid drainage gathering and transportation device according to claim 1, characterized in that: It also includes an overflow pipe (14). The inlet end of the overflow pipe (14) is fixedly installed and communicated with the top of the middle section of the liquid mixing cylinder (9). The outlet end of the overflow pipe (14) is communicated with the inside of the liquid storage tank (10); a sixth shut-off valve (25) is installed on the overflow pipe (14).

3. The wet gas intermittent liquid drainage gathering and transportation device according to claim 1, wherein: It also includes a medicine delivery component. The medicine delivery component includes a medicine pipe (19), a medicine pump (12), a medicine tank (11), and a fifth shut-off valve (24). The outlet end of the medicine pipe (19) is fixedly installed and communicated with the middle section of the liquid mixing cylinder (9). The inlet end of the medicine pipe (19) is fixedly installed and communicated with the medicine tank (11). The medicine pump (12) is installed at the end of the inlet end of the medicine pipe (19). The fifth shut-off valve (24) is installed at the end of the outlet end of the medicine pipe (19).

4. A wet gas intermittent liquid drainage gathering and transportation device according to claim 1, characterized in that: A gas flowmeter (5) is installed at the end of the inlet end of the gas transmission pipe (3). A first shut-off valve (20) is installed at the end of the gas transmission pipe (3) near one end of the gas-liquid mixed transmission pipe (7); a second shut-off valve (21) is installed on the injection gas pipe (17). A liquid flowmeter (6) and a fourth shut-off valve (23) are respectively installed on the liquid transmission pipe (4). A third shut-off valve (22) and an infusion pump (13) are respectively installed on the injection liquid pipe (18).

5. A wet gas intermittent liquid drainage gathering and transportation device according to claim 1, characterized in that: Inside the inflow end of the liquid distribution cylinder (9), a front isolation pig (15) is installed. Inside the outflow end of the liquid distribution cylinder (9), a rear isolation pig (16) is installed. A flexible steel member is bound to the tail end of the front isolation pig (15), and the end of the flexible steel member away from the front isolation pig (15) is bound to the head end of the rear isolation pig (16).

6. A wet gas intermittent drainage gathering and transportation process, based on the wet gas intermittent drainage gathering and transportation device according to any one of claims 1 to 5, characterized in that, It includes the following steps: A. Normal exhaust: Open the first shut-off valve (20) and the fourth shut-off valve (23), and close the second shut-off valve (21), the third shut-off valve (22), the fifth shut-off valve (24), and the sixth shut-off valve (25). The gas-liquid mixture produced at the wellhead flows through the wellhead incoming flow pipe (1) and enters the gas-liquid separator (2). The gas-liquid separator (2) separates the gas-liquid mixture into gas phase and liquid phase. The gas phase sequentially flows through the gas transmission pipe (3) and the gas-liquid mixed transmission pipe (7) and enters the gas gathering main station (8). The liquid phase flows through the liquid transmission pipe (4) and enters the liquid storage tank (10). B. Intermittent liquid drainage: Place the rear isolation pig (16) inside the liquid distribution cylinder (9) near one end of the gas-liquid mixed transmission pipeline (7), and place the front isolation pig (15) inside the liquid distribution cylinder (9) near one end of the gas transmission pipe (3). The front isolation pig (15) and the rear isolation pig (16) are bound by a flexible steel member. The front isolation pig (15) and the rear isolation pig (16) isolate a liquid storage cavity inside the liquid distribution cylinder (9). Open the third shut-off valve (22) on the liquid injection pipe (18), start the liquid delivery pump (13), and inject the liquid in the liquid storage tank (10) into the liquid storage cavity inside the liquid distribution cylinder (9). At the same time, open the fifth shut-off valve (24) on the chemical agent pipe (19), start the chemical agent pump (12), and the chemical agent pump (12) injects the corrosion inhibitor in the chemical agent tank (11) into the liquid storage cavity. The front isolation pig (15), the liquid at the liquid storage cavity, and the rear isolation pig (16) form a liquid plug. When it is observed that there is a liquid flow in the overflow pipe (14), it indicates that the liquid storage cavity is full of liquid. At this time, first close the third shut-off valve (22) and the fifth shut-off valve (24), stop the liquid delivery pump (13) and the chemical agent pump (12), and then close the sixth shut-off valve (25). Open the second shut-off valve (21), close the first shut-off valve 20. The gas phase separated by the gas-liquid separator (2) sequentially flows through the gas transmission pipe (3), the gas injection pipe (17), and the gas-liquid mixed transmission pipe (7) and enters the gas gathering main station (8). During the flow of this gas phase, the gas phase pushes the liquid plug to move. The liquid plug moves through the gas-liquid mixed transmission pipe (7), and the liquid plug is taken out at the gas gathering main station (8).

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