Associated gas condensate closed recovery device

Abstract

The application provides a kind of associated gas condensate closed recovery device, including integrated structure of pipeline type gas-liquid separator, liquid storage pipe, Y type filter and condensate lifting pump;Wherein, pipeline type gas-liquid separator, liquid storage pipe, Y type filter and condensate lifting pump are sequentially connected by each pipeline and valve.Based on the influence of gas-liquid separation heat exchange area, flow distribution, etc. when applying, the pipeline type gas-liquid separator proposed in the application adopts U-shaped tube bundle structure, which can reduce the temperature of associated gas to the ground temperature at the pipeline burial depth, avoid condensate precipitation and frozen pipeline in winter gas pipeline.The device provided by the application has the advantages of high gas-liquid separation efficiency, high integration degree, unattended staff reduction and efficiency improvement, etc., and has significant economic and social benefits, and meets the requirements of overall transportation, on-site safety installation of the device, solves the problems of frozen pipeline in winter gas pipeline in traditional technology, and can achieve the effect of preventing the winter gas pipeline from being blocked without excessive heat energy consumption.

Description

Technical Field

[0001] This application belongs to the field of oil and gas technology, and in particular relates to a closed recovery device for associated gas condensate. Background Technology

[0002] Associated gas typically refers to natural gas that coexists with petroleum. According to the theory of oil generation from organic hydrocarbons, organic matter can evolve into liquid and gaseous hydrocarbons. Gaseous hydrocarbons either dissolve in liquid hydrocarbons or exist as a cap in the upper part of the oil and gas reservoir. Both types of gaseous hydrocarbons are called associated gas. From the perspective of oil production, it refers to the natural gas extracted during the exploitation of an oil field or reservoir. Currently, in the development of low-permeability reservoirs, single-well fluid production is low, and oil wells often produce fluid intermittently. Simultaneously, as the well production time increases and water cut rises, associated gas in the wells becomes increasingly scarce. Therefore, how to effectively recover and utilize associated gas has become an urgent problem to be solved.

[0003] In the related technology of invention entitled "Integrated Recovery Device for Associated Gas in Well Site" with publication number CN 203741293 U, the integrated recovery device for associated gas mainly consists of four parts: associated gas compressor, diaphragm pump, gas-liquid separator, and blower. The heat generated by the compressor is used to heat the inlet and outlet gas-liquid separators through the blower to prevent freezing in winter and ensure stable operation of the equipment in winter.

[0004] However, in the aforementioned patent documents, the heat generated by the compressor is used to heat the inlet and outlet gas-liquid separators to prevent blockage. However, due to the low temperature in winter, the energy consumption requirements for heating the equipment are high, requiring a large amount of heat resources and resulting in a large amount of resource consumption, which is not conducive to clean production. Summary of the Invention

[0005] This application provides a closed-loop recovery device for associated gas condensate to solve the above-mentioned problems.

[0006] The technical solution adopted in this application to solve the above-mentioned technical problems is as follows:

[0007] A closed-loop recovery device for associated gas condensate includes an integrated structure of a pipeline gas-liquid separator, a storage pipe, a Y-type filter, and a condensate lift pump.

[0008] The inlet of the pipeline gas-liquid separator is connected to the associated gas inlet pipeline through a first shut-off valve, and the outlet is connected to the associated gas outlet pipeline through a second shut-off valve.

[0009] The condensate outlet of the pipeline gas-liquid separator is connected to a condensate manifold, and the condensate manifold is connected to the storage pipe through a control gate valve and a storage pipe inlet line.

[0010] The liquid storage pipe is connected to the pipeline gas-liquid separator via a liquid storage pipe gas connection line, and a gas connection line shut-off valve is installed on the liquid storage pipe gas connection line.

[0011] The storage pipe is connected to the Y-type filter through the manifold before the first booster pump. A liquid level data control electric ball valve is connected between the manifold before the first booster pump and the Y-type filter. The Y-type filter is connected to the inlet of the condensate booster pump through the manifold before the second booster pump. The flow rate of condensate entering the condensate booster pump is controlled by the opening degree of the electric ball valve.

[0012] The outlet of the condensate booster pump is connected to the condensate outlet manifold.

[0013] Optionally, a check valve after the booster pump and a ball valve after the booster pump are sequentially installed on the pipeline of the condensate outlet manifold.

[0014] Optionally, the condensate booster pump is connected to the booster pump check valve via a booster pump manifold, and the booster pump ball valve is connected to the condensate outlet manifold.

[0015] Optionally, the temperature drop simulation of the pipeline gas-liquid separator is calculated using Fluent simulation software, and the pipeline gas-liquid separator model is established and numerically simulated using the following calculation parameters, including:

[0016] With an associated gas treatment capacity of 6000 m³ / d, the inlet temperature was set to 30℃, the ambient temperature to -10℃, the inlet velocity to 5.659 m / s, and the natural convection heat transfer coefficient to 11 W / (m³). 2 •k) The pipe wall thickness is set to 4mm.

[0017] Optionally, the pipeline gas-liquid separator is a U-shaped tube bundle gas-liquid separator, including an associated gas inlet and an associated gas outlet, wherein the associated gas inlet and associated gas outlet are arranged in a low-inlet-high-outlet configuration.

[0018] Optionally, the condensate separated by cooling is collected through the inclined tube at the bottom of the multi-stage U-shaped tube separation structure of the pipeline gas-liquid separator, and then flows by gravity into the condensate manifold through the first, second, third, fourth, fifth, sixth and seventh condensate outlets set at the lower position on the multi-stage U-shaped tube separation structure.

[0019] Optionally, the diameter of the liquid storage tube is DN400 and the length is 0.24m;

[0020] The inlet line of the liquid storage pipe extends into the bottom of the liquid storage pipe and is submerged below the liquid surface to form a liquid seal;

[0021] A gas connection line for the liquid storage pipe is provided at the top of the liquid storage pipe;

[0022] The storage pipe is equipped with high and low liquid level monitoring ports, and the condensate booster pump is started and stopped through liquid level interlock.

[0023] Optionally, the pipeline gas-liquid separator is a multi-stage U-shaped tube bundle gas-liquid separator structure welded from pressure pipelines;

[0024] Each U-shaped tube bundle includes several interconnected inverted U-shaped pipes arranged in sequence. The U-shaped tube bundles at each level are interconnected. The multi-level U-shaped tube bundle separation structure also includes a row of pipes consisting of several vertical pipes and two horizontal pipes. The horizontal pipes are respectively set at the top and bottom of the vertical pipes. The horizontal pipe at the bottom of the vertical pipes is connected to the inverted U-shaped pipes. The associated gas outlet is set on the horizontal pipe at the top, and the associated gas inlet is set on the outermost inverted U-shaped tube bundle.

[0025] Optionally, the other end of the second, third, fourth, fifth, sixth, and seventh condensate outlets is provided with a flange cover; the other end of the first condensate outlet is provided with an associated gas inlet.

[0026] Optionally, the gas-liquid recovery device has an overall width of 2.5m and a height of 3m.

[0027] The technical solution provided in this application includes the following beneficial technical effects:

[0028] This application provides a closed-loop recovery device for associated gas condensate, comprising an integrated structure of a pipeline gas-liquid separator, a storage pipe, a Y-type filter, and a condensate booster pump. The pipeline gas-liquid separator, storage pipe, Y-type filter, and condensate booster pump are connected sequentially via various pipes and valves. Considering the influence of gas-liquid separation heat exchange area and flow distribution during application, the pipeline gas-liquid separator proposed in this application adopts a U-shaped tube bundle structure, which can reduce the temperature of the associated gas to the pipe temperature, causing the condensate in the associated gas to precipitate. The precipitated condensate flows by gravity through the inclined tube at the bottom of the U-shaped tube bundle into the condensate manifold, preventing condensate precipitation and freezing blockage of the gas collection pipeline in winter. During use, the condensate precipitated during the temperature drop of the associated gas through the pipeline gas-liquid separator flows by gravity into the storage pipe. The storage pipe has both storage and buffering functions, and high and low level ports are provided at its ends. The downstream condensate booster pump is started and stopped via a level interlock, achieving the purpose of closed-loop condensate transport. The device provided in this application has advantages such as high gas-liquid separation efficiency, high degree of integration, unmanned operation, reduced manpower and increased efficiency, and significant economic and social benefits. It also meets the requirements for overall transportation and safe on-site installation of the device, and solves the problems of freezing and blockage of gas collection pipelines in winter, failure of associated gas cooling, and inability to recover condensate in traditional technologies. Moreover, it can achieve the effect of preventing blockage of gas collection pipelines in winter without excessive heat energy consumption. Attached Figure Description

[0029] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a closed-loop recovery device for associated gas condensate provided in an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of one side of the pipeline gas-liquid separator provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the other side of the pipeline gas-liquid separator provided in the embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the physical model of the pipeline gas-liquid separator provided in the embodiments of this application;

[0034] Figure 5 This is a schematic diagram illustrating the mesh division of the model provided in the embodiments of this application;

[0035] Figure 6 Temperature cloud map of a pipeline gas-liquid separator with an inlet temperature of 30°C provided in the embodiments of this application;

[0036] Figure 7 Velocity cloud diagrams of the first, third, and fifth rows of heat exchange tubes provided for embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-First shut-off valve; 2-Second shut-off valve; 3-Gate valve; 4-Air-connection pipeline shut-off valve; 5-Electric ball valve; 6-Check valve after booster pump; 7-Blower pump ball valve; 8-Associated gas inlet pipeline; 9-Associated gas outlet pipeline; 10-Condensate manifold; 11-Storage pipe inlet pipeline; 12-Storage pipe air-connection pipeline; 13-First booster pump front manifold; 14-Second booster pump front manifold; 15-Booster pump rear manifold; 16-Condensate outlet manifold; 17-Pipeline gas-liquid separator; 18-Storage pipe; 19-Y Type 1 filter; 20-condensate booster pump; 21-first condensate outlet; 22-associated gas outlet; 23-second condensate outlet; 24-third condensate outlet; 25-fourth condensate outlet; 26-fifth condensate outlet; 27-sixth condensate outlet; 28-seventh condensate outlet; 29-seventh flange cover head; 30-associated gas inlet; 31-first flange cover head; 32-second flange cover head; 33-third flange cover head; 34-fourth flange cover head; 35-fifth flange cover head; 36-sixth flange cover head. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0040] To address the problems of associated gas pipeline freezing and blockage in winter, associated gas cooling failure, inability to recover condensate, and the need for extensive on-site operation, this application provides a closed-loop associated gas condensate recovery device. Figure 1 As shown, it includes an integrated structure that combines a pipeline gas-liquid separator 17, a liquid storage pipe 18, a Y-type filter 19, and a condensate lift pump 20.

[0041] For details, please refer to the appendix. Figure 1 The inlet of the pipeline gas-liquid separator 17 is connected to the associated gas inlet pipeline 8 through the first shut-off valve 1, and the outlet is connected to the associated gas outlet pipeline 9 through the second shut-off valve 2.

[0042] The condensate outlet of the pipeline gas-liquid separator 17 is connected to the condensate manifold 10, and the condensate manifold 10 is connected to the storage pipe 18 through the control gate valve 3 and the storage pipe inlet pipeline 11.

[0043] The liquid storage pipe 18 is connected to the pipeline gas-liquid separator 17 via a liquid storage pipe gas connection line 12, and a gas connection line shut-off valve 4 is provided on the liquid storage pipe gas connection line 12.

[0044] The storage pipe 18 is connected to the Y-type filter 19 through the first booster pump manifold 13. A liquid level data control electric ball valve 5 is connected between the first booster pump manifold 13 and the Y-type filter 19. The Y-type filter 19 is connected to the inlet of the condensate booster pump 20 through the second booster pump manifold 14. The flow rate of condensate entering the condensate booster pump 20 is controlled by the opening degree of the electric ball valve 5.

[0045] The outlet of the condensate booster pump 20 is connected to the condensate outlet manifold 16.

[0046] In one embodiment, a booster pump post-check valve 6 and a booster pump post-ball valve 7 are sequentially installed on the pipeline of the condensate outlet manifold 16; the condensate booster pump 20 is connected to the booster pump post-check valve 6 through the booster pump post-manifold 15, and the booster pump post-ball valve 7 is connected to the condensate outlet manifold 16.

[0047] In one embodiment, the pipeline gas-liquid separator 17 is a U-shaped tube bundle gas-liquid separator, such as... Figure 2 As shown, it includes an associated gas inlet 30 and an associated gas outlet 22, which are arranged in a low-inlet, high-outlet configuration to ensure that the associated gas passes evenly through all tube bundles. The condensate separated by cooling is collected by the inclined tube at the bottom of the multi-stage U-shaped tube separation structure of the pipeline gas-liquid separator 17, and then flows by gravity into the condensate manifold 10 through the condensate first outlet 21, condensate second outlet 23, condensate third outlet 24, condensate fourth outlet 25, condensate fifth outlet 26, condensate sixth outlet 27, and condensate seventh outlet 28 set at a low position on the multi-stage U-shaped tube separation structure.

[0048] In this embodiment, high and low liquid level monitoring ports are provided at the end of the storage pipe 18. When the liquid level in the storage pipe reaches the high level, the condensate lift pump 20 is turned on, and the electric ball valve 5 on the manifold 13 before the first lift pump is opened, allowing the condensate to enter the condensate lift pump 20. When the liquid level in the storage pipe reaches the low level, the condensate lift pump 20 is turned off, and the electric ball valve 5 on the manifold 13 before the first lift pump is closed, allowing the condensate to be stored in the storage pipe 18, thus achieving the effect of automatic pressurization and transportation of condensate.

[0049] In one embodiment, the pipeline gas-liquid separator 17 is a U-shaped tube bundle separation structure welded from pressure pipelines; such as Figure 2 As shown, each level of the U-shaped tube bundle includes several interconnected inverted U-shaped pipes arranged in sequence. The U-shaped tube bundles at each level are interconnected. The U-shaped tube bundle separation structure also includes a row of pipes composed of several vertical pipes and two horizontal pipes. The horizontal pipes are respectively set at the top and bottom of the vertical pipes. The horizontal pipe at the bottom of the vertical pipes is connected to the inverted U-shaped pipes. The associated gas outlet 22 and its corresponding seventh flange cover 29 are set on the horizontal pipe at the top. The associated gas inlet 30 and its corresponding condensate first outlet 21 are set on the outermost inverted U-shaped tube bundle.

[0050] like Figure 3 As shown, each stage of the U-shaped tube bundle is connected through a horizontal pipe at the bottom. Each horizontal pipe is respectively provided with the associated gas inlet 30 and its corresponding first condensate outlet 21, second condensate outlet 23 and its corresponding first flange cover 31, third condensate outlet 24 and its corresponding second flange cover 32, fourth condensate outlet 25 and its corresponding third flange cover 33, fifth condensate outlet 26 and its corresponding fourth flange cover 34, sixth condensate outlet 27 and its corresponding fifth flange cover 35, and seventh condensate outlet 28 and its corresponding sixth flange cover 36.

[0051] In one embodiment, the liquid storage pipe 18 has the functions of liquid storage and buffering. The diameter of the liquid storage pipe 18 is DN400, the length is 0.24m, the volume is 28L, and the condensate buffering time is calculated to be 3h based on the tank capacity.

[0052] The inlet pipe 11 of the liquid storage pipe extends into the bottom of the liquid storage pipe 18, so that the inlet pipe 11 is submerged below the liquid surface, forming a liquid seal effect to ensure that the gas and liquid phases do not block or cross-flow due to different gas pressures; the top of the liquid storage pipe 18 is provided with a gas connection pipe 12 to maintain the pressure balance between the liquid storage pipe 18 and the pipeline gas-liquid separator 17 and prevent gas blockage; the end of the liquid storage pipe 18 is provided with high and low liquid level ports, which start and stop the downstream condensate lift pump 20 through liquid level interlocking.

[0053] In this application's summary of embodiments, the temperature drop simulation of the pipeline gas-liquid separator 17 is calculated using Fluent simulation software, and the calculation parameters for the model are determined by using Fluent simulation software, including:

[0054] With an associated gas throughput of 6000 m³ / d, an inlet temperature of 30℃, an ambient temperature of -10℃, an inlet velocity of 5.659 m / s, and a natural convection heat transfer coefficient of 11 W / (m³), the following parameters are used: 2 •k) The pipe wall thickness is set to 4mm, and the model of the pipeline gas-liquid separator 17 is established and numerically simulated using this parameter.

[0055] In this embodiment of the application, the temperature contour map of the pipeline gas-liquid separator 17 model is detected using the aforementioned Fluent simulation software and the determined parameters, such as... Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown.

[0056] As can be seen from the velocity cloud diagram, the flow distribution characteristics of this pipeline gas-liquid separator are relatively uniform, and the heat exchange area can be fully utilized. When the inlet temperature of the associated gas in the pipeline gas-liquid separator is 30℃, after heat exchange with the environment through three sets of heat exchangers, the outlet temperature drops to 2.77℃ (below the pipe temperature, meeting the requirements). This ensures that the associated gas entering the pipeline gas-liquid separator 17 can be evenly distributed in flow, fully increasing the cooling heat exchange area of ​​the associated gas and effectively achieving gas-liquid separation.

[0057] In the specific use of the device provided in this application embodiment, the associated gas is connected to the pipeline gas-liquid separator 17 via the associated gas inlet pipeline 8. The associated gas is cooled and separated by the U-shaped tube bundle separation structure entering the pipeline gas-liquid separator 17. The separated associated gas is discharged through the associated gas outlet shut-off valve 2 and the associated gas outlet pipeline 9; the separated condensate flows by gravity into the condensate manifold 10 through each condensate outlet of the pipeline gas-liquid separator 17, and flows into the storage pipe 18 for buffering through the control gate valve 3 and the storage pipe inlet pipeline 11. The opening degree of the electric ball valve 5 is adjusted by the liquid level data of the storage pipe 18 to control the flow rate into the condensate booster pump 20, thereby achieving the purpose of closed-loop condensate transportation.

[0058] This application provides embodiments such as Figure 1 The associated gas condensate closed-loop recovery device shown integrates associated gas gas-liquid separation, condensate recovery, automatic condensate drainage, and remote monitoring functions. It boasts advantages such as high gas-liquid separation efficiency, high integration, unmanned operation, reduced manpower, and increased efficiency, resulting in significant economic and social benefits. Based on the influence of gas-liquid separation heat exchange area and flow distribution, the pipeline-type gas-liquid separator proposed in this embodiment, with its U-shaped tube bundle structure, can reduce the associated gas temperature to the pipe temperature (3°C), preventing condensate precipitation and pipe freezing in the gas collection pipeline during winter. Due to limitations in the width of transport vehicles and road height, the overall width and height of the integrated device structure provided in this embodiment are limited to 2.5m and 3m, respectively. The associated gas is cooled and separated by the U-shaped tube bundle gas-liquid separator, reducing its temperature below the pipeline transport temperature, causing condensate to precipitate. The precipitated condensate flows by gravity through the inclined tube at the bottom of the tube bundle separation structure into the condensate manifold. The condensate manifold has a slope, allowing the condensate to flow by gravity to a level below the liquid surface in the storage pipe, creating a liquid seal effect. The storage pipe serves both storage and buffering functions. It has a diameter of DN400, a volume of less than 30L, and a buffering time of 3 hours. The top of the storage pipe is equipped with an associated gas balancing port, connected to the outlet pipeline of the inline gas-liquid separator. High and low level ports are located at the ends, allowing for the interlocking start and stop of the downstream condensate booster pump. Two pairs of flange covers are fitted at both ends of the storage pipe for easy welding and internal maintenance. When the liquid level reaches the high or low level, the booster pump is interlocked to start and stop, and the condensate is pressurized and transported to the main flow before the oil pump at the station. This solves the problem of associated gas moisture accumulating during transportation, causing freezing and blockage of the gathering and transportation pipeline in winter. It helps reduce the risk of production accidents and provides technical support for the efficient gathering and transportation of associated gas in oil fields.

[0059] In one implementation embodiment, the various components of the associated gas condensate closed recovery device are remotely controlled via a PLC control cabinet system. This includes the PLC control cabinet system automatically collecting real-time liquid level data from the storage pipe and uploading the data to the station where the device is located. Remote monitoring, regular inspections, and emergency response are implemented to alleviate labor pressure. In another implementation embodiment, the PLC control cabinet system controls the opening and closing of various relevant valves in the recovery device.

[0060] In summary, the associated gas condensate closed-loop recovery device provided in this application embodiment utilizes pressure pipelines welded together to form a gas-liquid separator and a storage pipe, replacing the purchased air cooler and pressure vessel storage tank, significantly reducing the device construction cost and facilitating cost reduction and efficiency improvement in oilfield surface engineering. The use of a large-diameter pipeline-type gas-liquid separator ensures high condensate removal efficiency and solves pipeline blockage problems. The design fully considers factors such as site roads, equipment dimensions, weight, and transportation challenges in the Loess Plateau terrain. The optimized device is 2.5m wide and 3m high. Piping is prefabricated in the factory and then assembled on-site, meeting the requirements for overall device transportation and safe on-site installation. Furthermore, when the various components of the associated gas condensate closed-loop recovery device are remotely controlled via a PLC control cabinet system, the integrated device operates unattended. The PLC control cabinet system automatically collects real-time liquid level data from the storage pipe and uploads the data to the site. Remote monitoring, regular inspections, and emergency response mechanisms alleviate labor pressure.

[0061] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0063] It should be understood that this application is not limited to the content described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A closed-loop recovery device for associated gas condensate, characterized in that, An integrated structure including a pipeline gas-liquid separator (17), a liquid storage pipe (18), a Y-type filter (19), and a condensate lift pump (20); The inlet of the pipeline gas-liquid separator (17) is connected to the associated gas inlet pipeline (8) through the first shut-off valve (1), and the outlet is connected to the associated gas outlet pipeline (9) through the second shut-off valve (2). The condensate outlet of the pipeline gas-liquid separator (17) is connected to the condensate manifold (10), and the condensate manifold (10) is connected to the storage pipe (18) through the control gate valve (3) and the storage pipe inlet line (11). The liquid storage pipe (18) is connected to the pipeline gas-liquid separator (17) through the liquid storage pipe gas connection line (12), and the liquid storage pipe gas connection line (12) is equipped with a gas connection line shut-off valve (4). The storage pipe (18) is connected to the Y-type filter (19) through the first booster pump manifold (13). A liquid level data control electric ball valve (5) is connected between the first booster pump manifold (13) and the Y-type filter (19). The Y-type filter (19) is connected to the inlet of the condensate booster pump (20) through the second booster pump manifold (14). The flow rate of condensate entering the condensate booster pump (20) is controlled by the opening degree of the electric ball valve (5). The outlet of the condensate booster pump (20) is connected to the condensate outlet manifold (16). The pipeline gas-liquid separator (17) is a U-shaped tube bundle gas-liquid separator, including an associated gas inlet (30) and an associated gas outlet (22). The associated gas inlet (30) and the associated gas outlet (22) are arranged with a low inlet and a high outlet. The condensate separated by cooling is collected through the inclined tube at the bottom of the multi-stage U-shaped tube separation structure of the pipeline gas-liquid separator (17), and then flows into the condensate manifold (10) by gravity through the first condensate outlet (21), the second condensate outlet (23), the third condensate outlet (24), the fourth condensate outlet (25), the fifth condensate outlet (26), the sixth condensate outlet (27), and the seventh condensate outlet (28) set at a low position on the multi-stage U-shaped tube separation structure. The pipeline gas-liquid separator (17) is a multi-stage U-shaped tube bundle gas-liquid separator structure welded from pressure pipelines. Each stage of the U-shaped tube bundle includes several interconnected inverted U-shaped pipes arranged sequentially. The U-shaped tube bundles at each stage are interconnected. The multi-stage U-shaped tube separation structure also includes a row of pipes consisting of several vertical pipes and two horizontal pipes. The horizontal pipes are respectively located at the top and bottom of the vertical pipes. The horizontal pipe at the bottom of the vertical pipes is connected to the inverted U-shaped pipes. The associated gas outlet (22) and its corresponding seventh flange cover head (29) are provided on the horizontal pipe at the top. The associated gas inlet (30) and its corresponding first condensate outlet (21) are provided on the outermost inverted U-shaped pipe. Each stage of the U-shaped tube bundle The associated gas inlet (30) and its corresponding first condensate outlet (21), the second condensate outlet (23) and its corresponding first flange cover head (31), the third condensate outlet (24) and its corresponding second flange cover head (32), the fourth condensate outlet (25) and its corresponding third flange cover head (33), the fifth condensate outlet (26) and its corresponding fourth flange cover head (34), the sixth condensate outlet (27) and its corresponding fifth flange cover head (35), and the seventh condensate outlet (28) and its corresponding sixth flange cover head (36) are connected through the horizontal pipes at the bottom.

2. The associated gas condensate closed recovery device according to claim 1, characterized in that, The condensate outlet manifold (16) is equipped with a booster pump check valve (6) and a booster pump ball valve (7) in sequence.

3. The associated gas condensate closed recovery device according to claim 2, characterized in that, The condensate booster pump (20) is connected to the booster pump check valve (6) via the booster pump manifold (15), and the booster pump ball valve (7) is connected to the condensate outlet manifold (16).

4. The associated gas condensate closed recovery device according to claim 1, characterized in that, The temperature drop simulation of the pipeline gas-liquid separator (17) was calculated using Fluent simulation software, and the model of the pipeline gas-liquid separator (17) was established and numerically simulated using the following calculation parameters, including: With an associated gas treatment capacity of 6000 m³ / d, the inlet temperature was set to 30℃, the ambient temperature to -10℃, the inlet velocity to 5.659 m / s, and the natural convection heat transfer coefficient to 11 W / (m³). 2 •k) The pipe wall thickness is set to 4mm.

5. The associated gas condensate closed recovery device according to claim 1, characterized in that, The liquid storage tube (18) has a diameter of DN400 and a length of 0.24m; The inlet line (11) of the liquid storage pipe extends into the bottom of the liquid storage pipe (18), and the inlet line (11) of the liquid storage pipe is submerged below the liquid surface to form a liquid seal; A gas connection pipeline (12) is provided at the top of the liquid storage pipe (18). The storage pipe (18) is equipped with high and low liquid level monitoring ports at its end, and the condensate booster pump (20) is started and stopped by liquid level interlock.

6. The associated gas condensate closed recovery device according to claim 1, characterized in that, The overall width of the associated gas condensate closed recovery device is 2.5m and the height is 3m.

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