Skid-mounted equipment for recovering gaseous CO2 of wellhead manifold

Abstract

The invention provides a skid-mounted device for recovering gaseous CO2 of a wellhead manifold. The skid-mounted device comprises a skid-mounted base, a CO2 source; the CO2 injection module comprises a shield pump, a CO2 injection pump and a wellhead injection pipe network which are sequentially connected in series; the CO2 storage module comprises a storage manifold, the storage manifold is used for receiving CO2 fluid conveyed by a CO2 source, the storage manifold is provided with a gas recovery unit, and the gas recovery unit is used for recovering gas at the suction inlet of the shield pump, gas at the position between the output end of the shield pump and the suction end of the CO2 injection pump and gas at the output end of the injection pump into the storage manifold; and the auxiliary pressurization module is used for conveying the mixed fluid in the storage manifold to the suction end of the CO2 injection pump, and the auxiliary pressurization module further comprises two input modes. The problems that in the prior art, in the operation process of a shield pump and a CO2 injection pump, gasification is likely to be caused due to suction pressure and temperature changes, airlock is formed at the exhaust end, and gas needs to be exhausted into the atmosphere, so that atmospheric pollution is caused are solved.

Description

Technical Field

[0001] The present invention relates to the field of carbon dioxide injection during carbon dioxide flooding oil production in oil fields, and specifically to a skid-mounted device for recovering gaseous CO2 in a wellhead manifold. Background Art

[0002] With its unique physical properties, CO2 has been widely used in a wide range of industrial, military, and civilian fields. As its application scope continues to expand, environmental issues have also arisen. CO2 emissions have become a major source of environmental damage as its application has increased. Liquid CO2 flooding is a new process in tertiary oil recovery. Oilfield experts fully utilize the affinity and miscibility of CO2 with crude oil to improve recovery rates. The specific process uses a reciprocating CO2 injection pump to transport liquid CO2 stored in a CO2 tanker to the well site. The liquid, pressurized by a shielded pump, is then fed into a reciprocating plunger pump for further pressurization to increase downhole pressure. After connecting to the uphole pipeline through various manifold valves, the CO2 is injected into the downhole for driving. After the well valve is opened, the CO2 and natural gas mixture in the well returns to the manifold from the wellhead to the pump (hydraulic end) inlet. Since the various parts of the pump are blocked by air, the starting of the reciprocating pump and the shielded pump is affected. At this time, the air can only be exhausted in the pump outlet manifold. Only after the exhaust is vented can the shielded pump and the CO2 injection pump be started. When the oil well is filled, the CO2 gas in the manifold appears when the wellhead valve is closed, and it is emptied in the same way. Due to the frequent use of CO2 oil recovery technology, a large amount of CO2 is discharged into the atmosphere, damaging the environment. This is one of the reasons that hinder the development of CO2 oil recovery technology and promotion projects. Summary of the Invention

[0003] The problem to be solved by the present invention is to solve the problem that shielded pumps and CO2 injection pumps in traditional technologies are prone to forming air locks at the suction and discharge ends during operation, and need to be discharged into the atmosphere to release the air lock, causing atmospheric pollution.

[0004] The technical solution adopted by the present invention to solve the above problems is: a skid-mounted device for recovering gaseous CO2 from a wellhead manifold, comprising: skid-mounted base; CO2 source; The CO2 injection module includes a shielded pump, a CO2 injection pump, and a wellhead injection network arranged in series. The shielded pump is used to receive CO2 fluid delivered by the CO2 source and pressurize it to deliver it to the CO2 injection pump. The CO2 injection pump performs secondary pressurization on the fluid and injects it into the wellhead manifold through the wellhead injection network. The CO2 storage module includes a storage manifold for receiving CO2 fluid delivered by a CO2 source, and a gas recovery unit for recovering gas at the canned motor pump suction port, between the canned motor pump output port and the CO2 injection pump suction port, and at the injection pump output port, into the storage manifold for pressurized storage; The auxiliary boosting module is used to transport the mixed fluid in the storage manifold to the suction end of the CO2 injection pump for boosting.

[0005] There are also two operating modes: Quick start input mode after the air lock is released: the first electric stop valve and the second electric stop valve close the first manifold and the second manifold, and at the same time the second electric valve closes the channel entering the output end of the CO2 injection pump. The CO2 fluid is transferred from the CO2 source through the storage manifold to the vertical compression pump, and then pressurized. After secondary pressurization between the shielded pump and the CO2 injection pump, the gas resistance in the manifold is injected into the wellhead manifold; Conventional input mode: The first electric valve closes the channel entering the storage manifold, and the second electric valve closes the channel entering the suction and output ends of the CO2 injection pump. The CO2 fluid is injected into the wellhead manifold after the first pressurization from the CO2 source by the shielded pump and the second pressurization by the CO2 injection pump.

[0006] Traditionally, when shielded pumps and CO2 injection pumps are in operation, gas locks are easily formed at the suction and discharge ends, requiring venting to the atmosphere to release the gas lock, which can cause air pollution. This skid-mounted system addresses this problem through a synergistic combination of equipment design and operational mode. The gas recovery unit collects gas from the shielded pump suction port, the pipeline between the shielded pump and the CO2 injection pump, and the CO2 injection pump discharge port, preventing it from being released to the atmosphere. The auxiliary booster module pressurizes the mixed fluid in the storage manifold and delivers it to the CO2 injection pump suction port, stabilizing the pressure and reducing gas lock. In terms of operational mode, after the gas lock is released, the rapid start-up input mode bypasses the gas lock at the shielded pump front end by closing a valve, bypassing the gas lock at the shielded pump front end through a vertical compressor pump. Once the gas lock at the shielded pump front end is released, the system switches to normal input mode, utilizing a series-connected shielded pump and CO2 injection pump for step-by-step pressurization to suppress gas evolution and minimize the possibility of gas lock. This dual guarantee of equipment design and operational mode establishes a pollution control chain: "preventing gas lock, recovering gas, and reusing it," ensuring an environmentally friendly and efficient CO2 recovery process.

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

[0008] The vertical compression pump circulates and pressurizes the mixed fluid within the storage manifold, ensuring sufficient pressure to enter the CO2 injection pump. The second electric valve's three-way interface flexibly delivers the pressurized fluid to the CO2 injection pump's intake or output port, depending on system pressure and operating conditions. In the event of a gas lock, the pressurized fluid can be quickly delivered to the relevant location, promoting gas circulation into the storage manifold and quickly releasing the gas lock. Once the gas lock 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 comprises: A first electric valve, wherein the first electric valve is provided with a three-way interface connected to the CO2 source outlet, the storage manifold inlet and the shielded pump inlet respectively; A first manifold, wherein both ends of the first manifold are respectively connected to the suction end of the CO2 injection pump and the storage manifold; a first electric stop valve, which is installed on the first manifold and is used to control the opening and closing of the first manifold; A second manifold, wherein both ends of the second manifold are respectively connected to the output end of the CO2 injection pump and the storage manifold; The second electric shut-off valve is installed on the second manifold and is used to control the opening and closing of the second manifold. The first electric valve connects the CO2 source outlet, the storage manifold inlet, and the shielded pump inlet via a three-way interface. When a gas lock occurs, it can direct gas from the shielded pump's intake port into the storage manifold while allowing the CO2 source fluid to enter the storage manifold and mix with other gases, reducing air pressure and alleviating gas lock. The first manifold connects the CO2 injection pump's intake port and the storage manifold, and the first electric shut-off valve controls the opening and closing of the first manifold. When a gas lock occurs, the valve opens to allow gas to be recovered from the injection pump's intake port to the storage manifold. Once the gas lock is released, the valve closes to prevent fluid backflow and ensure system stability. The second manifold connects the CO2 injection pump's output port and the storage manifold, and the second electric shut-off valve controls its opening and closing. Gas from the injection pump's output port can be recovered 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 an injection main manifold and several independently controlled branch manifolds. The inlet of the injection main manifold is connected to the CO2 injection pump, and the outlet is connected to the wellhead manifolds of multiple oil wellheads through the branch manifolds.

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

[0012] Furthermore, a temperature regulating device is provided on the injection main manifold for maintaining the CO2 fluid in a phase stable range of 0-5°C.

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

[0014] Furthermore, a diverter check valve is provided at the connection between the diverter manifold and the wellhead manifold, and the flow direction of the diverter check valve is one-way conduction for the diverter manifold to be injected into the wellhead manifold.

[0015] Ensure that the fluid is unidirectionally guided from the diversion manifold into the wellhead manifold, prevent the fluid in the wellhead manifold from flowing back to the diversion manifold, avoid interference with the system, and ensure 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 compression pump. The flow direction of the inlet check valve is one-way from the first electric valve to the storage manifold, and the flow direction of the outlet check valve is one-way from the storage manifold to the vertical compression pump.

[0017] The inlet check valve ensures one-way flow of the fluid from the first electric valve to the storage manifold, and the outlet check valve ensures one-way flow of the fluid from the storage manifold to the vertical compression pump, preventing fluid backflow and ensuring smooth gas recovery and pressurization processes.

[0018] Furthermore, the storage manifold includes a cylindrical pipeline and a U-shaped connecting pipe. There are multiple pipelines, which are arranged in parallel and at intervals on the skid-mounted base. The ends of adjacent pipelines are respectively connected to the two ends of the U-shaped connecting pipe. The cross-sectional diameter of the U-shaped connecting pipe is smaller than the cross-sectional diameter 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 a U-shaped connecting pipe increase the storage manifold's capacity, accommodating more mixed fluids and providing buffer space for gas recovery and processing. The U-shaped connecting pipe's cross-sectional diameter is smaller than that of the pipelines. This creates a certain amount of disturbance and turbulence as the fluid flows through it, promoting gas-liquid mixing and facilitating gas recovery and processing.

[0020] Furthermore, manual gate valves are provided at the inlet and outlet of the storage manifold. The manual gate valves provided at the inlet and outlet of the storage manifold facilitate manual shutoff of the fluid passage during equipment maintenance, overhaul or emergency situations, thereby ensuring the safety of equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A top view of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 It 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 network; 5.1. Injection main manifold; 5.2. Diverter manifold; 5.3. Temperature control device; 5.4. Metering mechanism; 5.4.1. Flow meter; 5.4.2. Electric throttle valve; 5.5. Diverter 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 stop valve; 7.4. Second manifold; 7.5. Second electric stop valve; 8. Inlet check valve; 9. Outlet check valve; 10. Manual gate valve; 11. Auxiliary booster module; 11.1. Vertical compression pump; 11.2. Second electric valve. DETAILED DESCRIPTION

[0023] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components set forth in the following description or illustrated in the following figures. The present invention is capable of other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used herein are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and their variations herein is intended to cover the items and their equivalents set forth below and additional items. Unless otherwise specified or limited, the terms "mounted", "connected", "supported" and "coupled" and their variations are used broadly and cover direct mounting and indirect mounting, connection, support and coupling. In addition, "connected" and "coupled" are not limited to physical or mechanical connections or couplings.

[0024] Furthermore, on the first hand, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the mechanism or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second hand, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0025] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

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

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

[0028] CO2 injection module: This module consists of a series-connected canned motor pump 3, a CO2 injection pump 4, and a wellhead injection network 5. Canned motor pump 3 receives and pressurizes the CO2 fluid from CO2 source 2, then delivers it to CO2 injection pump 4, which performs a secondary pressurization on the fluid before injecting it into the wellhead manifold via the wellhead injection network 5.

[0029] CO2 storage module: includes a storage manifold 6 for receiving CO2 fluid from the CO2 source 2. The gas recovery unit 7 is an important component of the module and includes a first electric valve 7.1, a first manifold 7.2, and a second manifold 7.4. The first electric valve 7.1 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 through a three-way interface; the first manifold 7.2 is connected to the suction end of the CO2 injection pump 4 and the storage manifold 6; the second manifold 7.4 is connected to the output end of the CO2 injection pump 4 and the storage manifold 6. This gas recovery unit 7 can recover the gas at the suction end of the shielded pump 3, between the output end of the shielded pump 3 and the suction end of the CO2 injection pump 4, and at the output end of the CO2 injection pump 4 into the storage manifold 6.

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

[0031] Wellhead injection network 5: includes a 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 wellheads through the branch manifold 5.2. The main injection manifold 5.1 is equipped with a temperature control device 5.3 to maintain the temperature of the CO2 fluid within a phase-stable range of 0-5°C. The branch manifold 5.2 is equipped with a metering mechanism 5.4, which consists of a flowmeter 5.4.1 and an electric throttle valve 5.4.2 located downstream. 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 to the wellhead manifold.

[0032] The storage manifold 6 consists of multiple cylindrical pipelines 6.1 and U-shaped connecting pipes 6.2 arranged in parallel and spaced apart 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 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 compression pump 11.1 to ensure unidirectional flow from the storage manifold 6 to the vertical compression pump 11.1. Check valves are installed at the inlet of the first pipeline 6.1 and the outlet of the last pipeline 6.1, respectively. Manual gate valves 10 are also installed at both the inlet and outlet of the storage manifold 6.

[0033] Airlock handling and mode switching When an air lock occurs: When an air lock 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 that high-pressure gas flows 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. At the same time, the CO2 fluid from the CO2 source 2 enters the storage manifold 6 through the first electric valve 7.1 and mixes with the miscellaneous gas input at the air lock, reducing the air pressure at these three locations and alleviating the air lock.

[0034] Gas lock release process: After the mixed fluid in the storage manifold 6 is pressurized to greater than 0.25 MPa by the vertical compression pump 11.1, it is output from the output end of the vertical compression 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 at these two places is quickly circulated to the storage manifold 6, quickly releasing the gas lock.

[0035] Mode Switching: After the airlock is released, the first electric stop valve 7.3 and the second electric stop valve 7.5 seal the first manifold 7.2 and the second manifold 7.4, and the second electric valve 11.2 closes the channel at the output of the CO2 injection pump 4. The equipment enters the rapid start-up input mode. The CO2 fluid originates from the CO2 source 2, passes through the storage manifold 6, the vertical compression pump 11.1, and the CO2 injection pump 4, and after secondary pressurization, is injected into the wellhead manifold through the wellhead injection network 5. With the airlock at the front end of the canned motor pump 3 released, the first electric valve 7.1 closes the channel to the storage manifold 6, and the second electric valve 11.2 closes the channel to the suction and output of the CO2 injection pump 4. The equipment switches back to the normal input mode. The CO2 fluid originates from the CO2 source 2, is pressurized for the first time by the canned motor pump 3, and for the second time by the CO2 injection pump 4, and finally is injected into the wellhead manifold through the wellhead injection network 5.

[0036] The above description is merely a description of the preferred embodiment of the present invention and is not to be construed as limiting the scope of the claims. The present invention is not limited to the above embodiment, and variations in the specific structure are permitted. Any variations within the scope of the independent claims of the present invention are also within the scope of protection of the present invention.

Claims

1. A skid-mounted device for recovering gaseous CO2 from a wellhead manifold, characterized in that include: skid-mounted base (1); CO2 source (2); The CO2 injection module comprises a shielded pump (3), a CO2 injection pump (4), and a wellhead injection pipe network (5) which are sequentially arranged in series, wherein the shielded pump (3) is used to receive the CO2 fluid delivered by the CO2 source (2) and pressurize and deliver it to the CO2 injection pump (4), and the CO2 injection pump (4) performs secondary pressurization on the fluid and injects it into the wellhead manifold through the wellhead injection pipe network (5); The CO2 storage module comprises a storage manifold (6), the storage manifold (6) is used to receive the CO2 fluid delivered by the CO2 source (2), and the storage manifold (6) is provided with a gas recovery unit (7) for recovering the gas at the suction port of the shielded pump (3), the output end of the shielded pump (3), the suction port of the CO2 injection pump (4), and the output end of the injection pump into the storage manifold (6); An auxiliary boosting module (11) is used to transport the mixed fluid in the storage manifold (6) to the suction end of the CO2 injection pump (4). There are also two operating modes: Quick start input mode after the air lock is released: the first electric stop valve (7.3) and the second electric stop 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 to the output end of the CO2 injection pump (4). The CO2 fluid is injected into the wellhead manifold after secondary pressurization from the CO2 source (2) through the storage manifold (6), the vertical compression pump (11.1), and the CO2 injection pump (4); Conventional input mode: The first electric valve (7.1) closes the passage to the storage manifold (6), and the second electric valve (11.2) closes the passage to the suction end and the output end of the CO2 injection pump (4). The CO2 fluid is injected into the wellhead manifold after the first pressurization of the CO2 source (2) through the shielded pump (3) and the second pressurization of the CO2 injection pump (4).

2. The skid-mounted equipment for recovering gaseous CO2 from a wellhead manifold according to claim 1, characterized in that: The auxiliary boost module (11) comprises a vertical compression pump (11.1), the suction end of the vertical compression pump (11.1) is connected to the outlet of the storage manifold (6), and 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 respectively connected to the output end of the vertical compression pump (11.1), the suction end of the CO2 injection pump (4), and the output end of the CO2 injection pump (4).

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

4. The skid-mounted equipment for recovering gaseous CO2 from a wellhead manifold according to claim 1, characterized in that: The wellhead injection pipe network (5) comprises an injection main manifold (5.1) and a plurality of independently controlled branch manifolds (5.2). The inlet of the injection main manifold (5.1) is connected to the CO2 injection pump (4), and the outlet thereof is connected to the wellhead manifolds of a plurality of oil wellheads through the branch manifolds (5.2).

5. The skid-mounted equipment for recovering gaseous CO2 from a wellhead manifold according to claim 4, characterized in that: The injection main manifold (5.1) is provided with a temperature regulating device (5.3) for maintaining the CO2 fluid in a phase stable range of 0-5°C.

6. The skid-mounted equipment for recovering gaseous CO2 from a wellhead manifold according to claim 4, characterized in that: A metering mechanism (5.4) is installed on the diversion 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 equipment for recovering gaseous CO2 from a wellhead manifold 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, and the flow direction of the diversion check valve (5.5) is one-way conduction from the diversion manifold (5.2) to the wellhead manifold.

8. The skid-mounted equipment for recovering gaseous CO2 from a wellhead manifold 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 compression pump (11.1). The flow direction of the inlet check valve (8) is one-way from the first electric valve (7.1) to the storage manifold (6), and the flow direction of the outlet check valve (9) is one-way from the storage manifold (6) to the vertical compression pump (11.1).

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

10. The skid-mounted equipment for recovering gaseous CO2 from a wellhead manifold according to claim 9, characterized in that: Manual gate valves (10) are provided at the inlet and outlet of the storage manifold (6).

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