A skid-mounted device for recovering gaseous CO2 from wellhead manifolds.

Abstract

The present application provides a kind of for recovering wellhead manifold gaseous CO2 skid-mounted equipment, comprising: skid base;CO2 source;CO2 injection module, including shielding pump, CO2 injection pump, wellhead injection pipe network arranged in series;CO2 storage module, including storage manifold, storage manifold is used to receive the CO2 fluid transported by CO2 source, storage manifold is equipped with gas recovery unit, for the gas recovery between the suction inlet of shielding pump and the output end of shielding pump and the suction end of CO2 injection pump and the output end of injection pump is in storage manifold;Auxiliary booster module, auxiliary booster module is used to transport the mixed fluid in storage manifold to the suction end of CO2 injection pump, also includes two input modes.Solve the problem that shielding pump and CO2 injection pump in traditional technology are easy to cause gasification and gas lock to form in discharge end due to suction pressure, temperature change in operation, need to discharge gas to atmosphere to cause air pollution.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide injection in oilfield carbon dioxide flooding production, specifically to a skid-mounted device for recovering gaseous CO2 from wellhead manifolds. Background Technology

[0002] Due to its unique physical properties, CO2 has been widely used in various industrial, military, and civilian fields. However, this expanding application has also brought environmental challenges. CO2 emissions have become a major contributor to environmental damage as usage increases. Liquid CO2-based enhanced oil recovery (EOR) is a novel technology in tertiary oil recovery, where oilfield experts leverage the affinity and miscibility of CO2 with crude oil to enhance recovery rates. The specific process involves a reciprocating CO2 injection pump transporting liquid CO2 from a tanker truck to the well site. The liquid CO2 is then pressurized by a shielded pump and further pressurized by a reciprocating plunger pump to increase the downhole pressure. Finally, the CO2 is injected into the well via various manifold valves connected to the surface pipeline. After the wellhead valve is opened, the CO2 and natural gas mixture in the wellhead returns to the manifold from the wellhead to the pump (hydraulic end) inlet. Due to air resistance in various parts of the pump, the starting of the reciprocating pump and the canned motor pump is affected. At this time, the air can only be vented in the pump outlet manifold. Only after venting can the canned motor pump and CO2 injection pump be started. When the well is filled and the wellhead valve is closed, CO2 gas will be stored in the manifold again. The same method is used to vent it. Because CO2 flooding is frequent, a large amount of CO2 is emitted into the atmosphere, which damages the environment. This is one of the reasons that hinders the development and promotion of CO2 flooding technology. Summary of the Invention

[0003] The problem this invention aims to solve is the issue that traditional shielded pumps and CO2 injection pumps are prone to airlock during operation due to the formation of airlocks at the intake and exhaust ends, requiring the pumps to be released into the atmosphere to release the airlocks, thus causing air pollution.

[0004] The technical solution adopted by this invention to solve the above problems is: a skid-mounted device for recovering gaseous CO2 from wellhead manifolds, comprising: Skid-mounted base; CO2 source; The CO2 injection module includes a shielded pump, a CO2 injection pump, and a wellhead injection pipeline arranged in series. The shielded pump is used to receive CO2 fluid from the CO2 source and pressurize it to deliver it to the CO2 injection pump. The CO2 injection pump pressurizes the fluid a second time and injects it into the wellhead manifold through the wellhead injection pipeline. The CO2 storage module includes a storage manifold for receiving CO2 fluid from a CO2 source. The storage manifold is equipped with a gas recovery unit for recovering the gas from the inlet and outlet of the shielded pump and the inlet of the CO2 injection pump, as well as the outlet of the injection pump, into the storage manifold for pressurization and storage. An auxiliary pressurization module is used to deliver the mixed fluid in the storage manifold to the suction end of the CO2 injection pump for pressurization.

[0005] It also includes the following two operating modes: Quick start input mode after gas lock release: The first electric shut-off valve and the second electric shut-off valve close the first manifold and the second manifold. At the same time, the second electric valve closes the channel into the output end of the CO2 injection pump. The CO2 fluid is delivered from the CO2 source through the storage manifold, to the vertical compression pump, and pressurized to increase the pressure between the shielded pump and the CO2 injection pump. Then, the gas lock in the manifold is injected into the wellhead manifold. Normal input mode: The first electric valve closes the channel into the storage manifold, and the second electric valve closes the channel into the CO2 injection pump's suction and output ends. CO2 fluid is injected into the wellhead manifold after being pressurized for the first time by the CO2 source and then pressurized for the second time by the CO2 injection pump.

[0006] In traditional technologies, airlocks easily form at the intake and exhaust ends of canned motor pumps and CO2 injection pumps during operation, requiring venting to the atmosphere to release the airlocks and causing air pollution. This skid-mounted equipment addresses this problem through a synergistic design and operating mode. On the equipment side, the gas recovery unit collects gas from the canned motor pump intake, the pipeline between the canned motor pump and the CO2 injection pump, and the CO2 injection pump output, preventing atmospheric release. An auxiliary pressurization module pressurizes the mixed fluid in the storage manifold and delivers it to the CO2 injection pump intake, stabilizing pressure and reducing airlocks. In terms of operating mode, the rapid start input mode after airlock release bypasses the airlock at the canned motor pump by closing a valve, allowing gas to bypass the vertical compressor pump and enter the CO2 injection pump. Once the airlock at the canned motor pump is released, the system switches to the normal input mode, utilizing the series-connected stepped pressurization of the canned motor pump and the CO2 injection pump to suppress gas release and reduce the likelihood of airlocks. This dual protection of equipment design and operating mode establishes a pollution control chain of "anti-airlock - recovered gas - reuse," achieving both environmental protection and high efficiency in the CO2 recovery process.

[0007] Furthermore, the auxiliary booster module includes a vertical compressor pump, the suction end of which is connected to the outlet of the storage manifold, and a second electric valve is installed at the output end. The second electric valve has a three-way interface that is respectively connected to the output end of the vertical compressor pump, the suction end of the CO2 injection pump, and the output end of the CO2 injection pump.

[0008] The vertical compressor pump circulates and pressurizes the mixed fluid within the storage manifold, ensuring sufficient pressure for entry into the CO2 injection pump. The three-way interface of the second electric valve can flexibly deliver the pressurized fluid to the suction or output end of the CO2 injection pump based on system pressure and operating status. In the event of airlock, the pressurized fluid can be rapidly delivered to the relevant location, promoting gas circulation back into the storage manifold and quickly releasing the airlock. After the airlock is released, the delivery path can be switched according to different modes to ensure efficient operation of the equipment.

[0009] Furthermore, the gas recovery unit includes: The first electric valve is provided with a three-way interface that is respectively connected to the CO2 source outlet, the storage manifold inlet and the shielded pump inlet; The first manifold is connected at both ends to the suction end of the CO2 injection pump and the storage manifold, respectively. The first electric shut-off valve is installed on the first manifold and is used to control the opening and closing of the first manifold. The second manifold is connected at both ends to the output end of the CO2 injection pump and the storage manifold, respectively. The second electrically operated shut-off valve, installed on the second manifold, controls its opening and closing. The first electrically operated valve connects the CO2 source outlet, the storage manifold inlet, and the canned motor pump inlet via a three-way connector. In the event of gas lock, it introduces gas from the canned motor pump's suction end into the storage manifold, while simultaneously allowing the CO2 source fluid to enter and mix with impurities, reducing pressure and alleviating gas lock. The first manifold connects the CO2 injection pump's suction end to the storage manifold, and the first electrically operated shut-off valve controls its opening and closing. In the event of gas lock, the valve opens to allow gas to be recovered from the injection pump's suction end to the storage manifold; after the gas lock is released, the valve closes to prevent backflow and ensure system stability. The second manifold connects the CO2 injection pump's output end to the storage manifold, and the second electrically operated shut-off valve controls its opening and closing. It recovers gas from the injection pump's output end to the storage manifold, working in conjunction with the first manifold to achieve comprehensive gas recovery from different parts of the pump, effectively alleviating gas lock.

[0010] Furthermore, the wellhead injection network includes a main injection manifold and several independently controlled branch manifolds. The inlet of the main injection manifold is connected to the CO2 injection pump, and its outlet is connected to the wellhead manifolds of multiple oil wells through the branch manifolds.

[0011] The main injection manifold is connected to the CO2 injection pump and is connected to the wellhead manifolds of multiple wellheads through multiple independently controlled branch manifolds, which can inject CO2 fluid into multiple wells at the same time, improving operational efficiency.

[0012] Furthermore, the injection main manifold is equipped with a temperature regulation device to maintain the CO2 fluid in a stable phase range of 0-5℃.

[0013] Furthermore, a metering mechanism is installed on the diversion manifold, comprising a flow meter and an electrically operated throttle valve, with the throttle valve installed downstream of the flow meter. The flow meter monitors the flow rate within the diversion manifold in real time, and the electrically operated throttle valve adjusts according to the flow data to ensure that the injection volume of each well meets the requirements, thereby improving resource utilization efficiency.

[0014] Furthermore, a diversion check valve is provided at the connection between the diversion manifold and the wellhead manifold, and the flow direction of the diversion check valve is unidirectional, allowing the diversion manifold to flow into the wellhead manifold.

[0015] Ensure that fluid flows unidirectionally from the branch manifold into the wellhead manifold, preventing backflow of fluid from the wellhead manifold back into the branch manifold, avoiding interference with the system, and ensuring the stability of the injection process.

[0016] Furthermore, an inlet check valve is provided between the storage manifold and the first electric valve, and an outlet check valve is provided between the storage manifold and the vertical compressor pump. The flow direction of the inlet check valve is unidirectional from the first electric valve to the storage manifold, and the flow direction of the outlet check valve is unidirectional from the storage manifold to the vertical compressor pump.

[0017] The inlet check valve ensures unidirectional flow of fluid from the first electric valve to the storage manifold, while the outlet check valve ensures unidirectional flow of fluid from the storage manifold to the vertical compressor pump, preventing backflow and ensuring the smooth operation of the gas recovery and pressurization process.

[0018] Furthermore, the storage manifold includes cylindrical pipelines and U-shaped connecting pipes. Multiple pipelines are arranged in parallel at intervals on the skid-mounted base. The beginning and end of adjacent pipelines are connected to the two ends of the U-shaped connecting pipes, respectively. The cross-sectional diameter of the U-shaped connecting pipe is smaller than that of the pipeline. The check valves are respectively arranged at the inlet of the first pipeline and the outlet of the last pipeline.

[0019] Multiple parallel cylindrical pipelines connected to U-shaped connectors increase the volume of the storage manifold, allowing it to hold more mixed fluid and providing buffer space for gas recovery and treatment. The cross-sectional diameter of the U-shaped connector is smaller than that of the pipeline, causing some disturbance and turbulence as the fluid flows through it, promoting gas-liquid mixing and facilitating gas recovery and treatment.

[0020] Furthermore, manual gate valves are installed at both the inlet and outlet of the storage manifold. These manual gate valves facilitate the manual shut-off of the fluid flow during equipment maintenance, repairs, or emergencies, ensuring the safety of the equipment and personnel. Attached Figure Description

[0021] Figure 1 This is a top view of the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is a linear schematic diagram of the present invention.

[0022] Diagram: 1. Skid-mounted base; 2. CO2 source; 3. Shielded pump; 4. CO2 injection pump; 5. Wellhead injection pipeline network; 5.1. Main injection manifold; 5.2. Diversion manifold; 5.3. Temperature control device; 5.4. Metering mechanism; 5.4.1. Flow meter; 5.4.2. Electric throttle valve; 5.5. Diversion check valve; 6. Storage manifold; 6.1. Pipeline; 6.2. U-shaped connecting pipe; 7. Gas recovery unit; 7.1. First electric valve; 7.2. First manifold; 7.3. First electric shut-off valve; 7.4. Second manifold; 7.5. Second electric shut-off valve; 8. Inlet check valve; 9. Outlet check valve; 10. Manual gate valve; 11. Auxiliary booster module; 11.1. Vertical compressor pump; 11.2. Second electric valve. Detailed Implementation

[0023] Before detailing any embodiment of the invention, it should be understood that the invention, in its application, is not limited to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention can have other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0024] Furthermore, firstly, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0025] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Please see Figures 1 to 3 A skid-mounted device for recovering gaseous CO2 from wellhead manifolds mainly consists of a skid-mounted base 1, a CO2 source 2, a CO2 injection module, a CO2 storage module, and an auxiliary pressurization module 11.

[0028] CO2 Injection Module: This module consists of a shielded pump 3, a CO2 injection pump 4, and a wellhead injection network 5 connected in series. The shielded pump 3 is responsible for receiving and pressurizing the CO2 fluid from the CO2 source 2, and then delivering it to the CO2 injection pump 4. The CO2 injection pump 4 further pressurizes the fluid, and finally injects the CO2 fluid into the wellhead manifold through the wellhead injection network 5.

[0029] The CO2 storage module includes a storage manifold 6 for receiving CO2 fluid from the CO2 source 2. The gas recovery unit 7 is a crucial component of this module, comprising a first electric valve 7.1, a first manifold 7.2, and a second manifold 7.4. The first electric valve 7.1 connects to the outlet of the CO2 source 2, the inlet of the storage manifold 6, and the inlet of the canned motor pump 3 via a three-way connector. The first manifold 7.2 connects to the suction end of the CO2 injection pump 4 and the storage manifold 6. The second manifold 7.4 connects to the output end of the CO2 injection pump 4 and the storage manifold 6. This gas recovery unit 7 can recover gas from the suction inlet of the canned motor pump 3, the area between the output end of the canned motor pump 3 and the suction end of the CO2 injection pump 4, and the output end of the CO2 injection pump 4 into the storage manifold 6.

[0030] Auxiliary booster module 11: consists of a vertical compressor pump 11.1 and a second electric valve 11.2. The suction end of the vertical compressor pump 11.1 is connected to the outlet of the storage manifold 6, and the second electric valve 11.2 installed at its output end has a three-way interface, which is connected to the output end of the vertical compressor pump 11.1, the suction end of the CO2 injection pump 4, and the output end of the CO2 injection pump 4, respectively.

[0031] Wellhead injection network 5: includes the main injection manifold 5.1 and several independently controlled branch manifolds 5.2. The inlet of the main injection manifold 5.1 is connected to the CO2 injection pump 4, and the outlet is connected to the wellhead manifolds of multiple oil wells through the branch manifolds 5.2. The main injection manifold 5.1 is equipped with a temperature regulating device 5.3, which can maintain the CO2 fluid temperature within the stable phase range of 0-5℃. The branch manifold 5.2 is equipped with a metering mechanism 5.4, which consists of a flow meter 5.4.1 and an electric throttle valve 5.4.2 located downstream of it. A branch check valve 5.5 is installed at the connection between the branch manifold 5.2 and the wellhead manifold to ensure unidirectional flow of fluid from the branch manifold 5.2 into the wellhead manifold.

[0032] The storage manifold 6 consists of multiple parallel, spaced cylindrical pipelines 6.1 and U-shaped connecting pipes 6.2 arranged on the skid-mounted base 1. Adjacent pipelines 6.1 are connected end-to-end via the U-shaped connecting pipes 6.2, and the cross-sectional diameter of the U-shaped connecting pipes 6.2 is smaller than that of the pipelines 6.1. An inlet check valve 8 is installed between the storage manifold 6 and the first electric valve 7.1 to ensure unidirectional fluid flow from the first electric valve 7.1 to the storage manifold 6. An outlet check valve 9 is installed between the storage manifold 6 and the vertical compressor pump 11.1 to ensure unidirectional fluid flow from the storage manifold 6 to the vertical compressor pump 11.1. Additionally, check valves are installed at the inlet of the first pipeline 6.1 and the outlet of the last pipeline 6.1, and manual gate valves 10 are installed at both the inlet and outlet of the storage manifold 6.

[0033] Airlock handling and mode switching When an airlock occurs: When an airlock occurs at the suction end of the canned motor pump 3, between the output end of the canned motor pump 3 and the injection end of the CO2 injection pump 4, and at the output end of the CO2 injection pump 4, based on the principle of high-pressure gas flowing to low-pressure areas, the gas at the suction end of the canned motor pump 3 enters the storage manifold 6 through the first electric valve 7.1; the gas between the output end of the canned motor pump 3 and the injection end of the CO2 injection pump 4 enters the storage manifold 6 through the first manifold 7.2; and the gas at the output end of the CO2 injection pump 4 enters the storage manifold 6 through the second manifold 7.4. Simultaneously, the CO2 fluid from the CO2 source 2 enters the storage manifold 6 through the first electric valve 7.1, mixing with the impurities introduced at the airlock location, reducing the gas pressure at the above three locations, and alleviating the airlock situation.

[0034] Gas lock release process: The mixed fluid in the storage manifold 6 is pressurized to a pressure greater than 0.25 MPa by the vertical compressor pump 11.1, and then output from the output end of the vertical compressor pump 11.1 to the second electric valve 11.2, and then enters the suction end and output end of the CO2 injection pump 4, so that the gas in these two places is quickly circulated into the storage manifold 6, and the gas lock is quickly released.

[0035] Mode Switching: After the gas lock is released, the first electric shut-off valve 7.3 and the second electric shut-off valve 7.5 close the first manifold 7.2 and the second manifold 7.4, and the second electric valve 11.2 closes the channel at the output end of the CO2 injection pump 4. The equipment enters the rapid start input mode, that is, the CO2 fluid starts from the CO2 source 2, passes through the storage manifold 6, the vertical compressor pump 11.1, and the CO2 injection pump 4 in sequence, and after secondary pressurization, it is injected into the wellhead manifold through the wellhead injection network 5. As the gas lock at the front end of the shielded pump 3 is released, the first electric valve 7.1 closes the channel entering the storage manifold 6, and the second electric valve 11.2 closes the channels entering the suction end and the output end of the CO2 injection pump 4. The equipment switches back to the normal input mode, that is, the CO2 fluid starts from the CO2 source 2, passes through the shielded pump 3 for the first pressurization, the CO2 injection pump 4 for the second pressurization, and finally is injected into the wellhead manifold through the wellhead injection network 5.

[0036] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A skid-mounted device for recovering gaseous CO2 from wellhead manifolds, characterized in that... include: Skid-mounted base (1); CO2 source (2); The CO2 injection module includes a shielded pump (3), a CO2 injection pump (4), and a wellhead injection pipeline (5) arranged in series. The shielded pump (3) is used to receive CO2 fluid from the CO2 source (2) and pressurize it to the CO2 injection pump (4). The CO2 injection pump (4) pressurizes the fluid a second time and injects it into the wellhead manifold through the wellhead injection pipeline (5). The CO2 storage module includes a storage manifold (6), which is used to receive CO2 fluid delivered by the CO2 source (2). The storage manifold (6) is provided with a gas recovery unit (7) for recovering the gas from the inlet of the shielded pump (3), the outlet of the shielded pump (3) and the inlet of the CO2 injection pump (4), and the outlet of the injection pump into the storage manifold (6). An auxiliary booster module (11) is used to deliver the mixed fluid in the storage manifold (6) to the suction end of the CO2 injection pump (4). It also includes the following two operating modes: Quick start input mode after gas lock release: The first electric shut-off valve (7.3) and the second electric shut-off valve (7.5) close the first manifold (7.2) and the second manifold (7.4), and at the same time the second electric valve (11.2) closes the channel into the output end of the CO2 injection pump (4). The CO2 fluid is injected into the wellhead manifold after being pressurized twice from the CO2 source (2) through the storage manifold (6), the vertical compression pump (11.1), and the CO2 injection pump (4). Normal input mode: The first electric valve (7.1) closes the channel into the storage manifold (6), and the second electric valve (11.2) closes the channel into the suction end and output end of the CO2 injection pump (4). The CO2 fluid is injected into the wellhead manifold after being first pressurized by the shielded pump (3) and second pressurized by the CO2 injection pump (4) from the CO2 source (2).

2. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 1, characterized in that: The auxiliary booster module (11) includes a vertical compressor pump (11.1). The suction end of the vertical compressor pump (11.1) is connected to the outlet of the storage manifold (6). A second electric valve (11.2) is installed at the output end. The second electric valve (11.2) is provided with a three-way interface that is connected to the output end of the vertical compressor pump (11.1), the suction end of the CO2 injection pump (4), and the output end of the CO2 injection pump (4) respectively.

3. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 1, characterized in that: The gas recovery unit (7) includes: The first electric valve (7.1) is provided with a three-way interface that is connected to the outlet of the CO2 source (2), the inlet of the storage manifold (6) and the inlet of the shielded pump (3); The first manifold (7.2) has its two ends connected to the suction end of the CO2 injection pump (4) and the storage manifold (6), respectively. The first electric shut-off valve (7.3) is installed on the first manifold (7.2) and is used to control the opening and closing of the first manifold (7.2); The second manifold (7.4) is connected at both ends to the output end of the CO2 injection pump (4) and the storage manifold (6), respectively. The second electric shut-off valve (7.5) is installed on the second manifold (7.4) and is used to control the opening and closing of the second manifold (7.4).

4. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 1, characterized in that: The wellhead injection network (5) includes an injection main manifold (5.1) and several independently controlled branch manifolds (5.2). The inlet of the injection main manifold (5.1) is connected to the CO2 injection pump (4), and its outlet is connected to the wellhead manifolds of multiple oil wells through the branch manifolds (5.2).

5. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 4, characterized in that: The main injection manifold (5.1) is equipped with a temperature regulation device (5.3) to maintain the CO2 fluid in a stable phase range of 0-5℃.

6. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 4, characterized in that: A metering mechanism (5.4) is installed on the manifold (5.2). The metering mechanism (5.4) includes a flow meter (5.4.1) and an electric throttle valve (5.4.2). The electric throttle valve (5.4.2) is installed downstream of the flow meter (5.4.1).

7. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 4, characterized in that: A diversion check valve (5.5) is provided at the connection between the diversion manifold (5.2) and the wellhead manifold. The flow direction of the diversion check valve (5.5) is unidirectional, allowing the diversion manifold (5.2) to flow into the wellhead manifold.

8. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 1, characterized in that: An inlet check valve (8) is provided between the storage manifold (6) and the first electric valve (7.1), and an outlet check valve (9) is provided between the storage manifold (6) and the vertical compressor pump (11.1). The flow direction of the inlet check valve (8) is unidirectional from the first electric valve (7.1) to the storage manifold (6), and the flow direction of the outlet check valve (9) is unidirectional from the storage manifold (6) to the vertical compressor pump (11.1).

9. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 8, characterized in that: The storage manifold (6) includes cylindrical pipelines (6.1) and U-shaped connecting pipes (6.2). Multiple pipelines (6.1) are arranged in parallel at intervals on the skid-mounted base (1). The ends of adjacent pipelines (6.1) are connected to the two ends of the U-shaped connecting pipes (6.2). The cross-sectional diameter of the U-shaped connecting pipes (6.2) is smaller than that of the pipelines (6.1). The inlet check valve (8) is arranged at the inlet of the first pipeline (6.1), and the outlet check valve (9) is arranged at the outlet of the last pipeline (6.1).

10. The skid-mounted device for recovering gaseous CO2 from wellhead manifolds according to claim 9, characterized in that: The storage manifold (6) is equipped with manual gate valves (10) at both its inlet and outlet.

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