CO2 skid-mounted injection device

Abstract

The present invention provides a CO2 skid-mounted injection device, which includes a storage tank module, an injection module, a connecting pipeline and a regulating valve. The storage tank module includes a first skid and a storage tank installed on the first skid, and the storage tank is used to contain CO2. The injection module includes a second skid, an injection pump, a heater and a metering mechanism, and the injection pump, the heater and the metering mechanism are installed on the second skid. The connecting pipeline connects the storage tank, the injection pump, the heater and the metering mechanism and can be connected to an oil well. The CO2 in the storage tank can flow through the injection pump, the heater and the metering mechanism in sequence and flow into the oil well. The regulating valve is arranged on the connecting pipeline and is used to control the on-off of the connecting pipeline.

Description

Technical Field

[0001] The present invention relates to the field of oil production, and in particular to a CO2 skid-mounted injection device. Background Art

[0002] In the early stages of oilfield development, oil gushes out under natural pressure. As production continues and pressure decreases, production declines. Currently, water flooding is the most common method, injecting water into the oil layer to increase pressure and force out the oil. Using carbon dioxide (CO2) instead of water can significantly increase oil recovery. When CO2 is injected into the oilfield, it displaces the oil through supercritical extraction, swelling, and viscosity reduction, achieving higher recovery rates than water flooding. Summary of the Invention

[0003] In view of the problems existing in the background technology, the purpose of the present invention is to provide a CO2 skid-mounted injection device, which can use CO2 to drive oil, quickly move and install the CO2 skid-mounted injection device, realize rapid injection of remote blocks and remote oil wells, and improve oil production efficiency.

[0004] In order to achieve the above-mentioned object, the present invention provides a CO2 skid-mounted injection device, which includes a storage tank module, an injection module, a connecting pipeline and a regulating valve. The storage tank module includes a first skid and a storage tank installed on the first skid, and the storage tank is used to contain CO2. The injection module includes a second skid, an injection pump, a heater and a metering mechanism, and the injection pump, the heater and the metering mechanism are installed on the second skid. The connecting pipeline connects the storage tank, the injection pump, the heater and the metering mechanism, and can be connected to an oil well. The CO2 in the storage tank can flow through the injection pump, the heater and the metering mechanism in sequence and flow into the oil well. The regulating valve is arranged on the connecting pipeline and is used to control the on-off of the connecting pipeline.

[0005] In some embodiments of the skid-mounted CO2 injection device, the connecting pipelines include: a liquid-phase outflow pipeline connecting the storage tank and the injection pump; a gas-phase return pipeline connecting the injection pump and the storage tank; a liquid-phase return pipeline connecting the injection pump and the storage tank; and a liquid-phase outlet pipeline for connecting the injection pump and the oil well. The heater and the metering mechanism are located on the liquid-phase outlet pipeline. The regulating valve is also located on each of the liquid-phase outflow pipeline, the gas-phase return pipeline, the liquid-phase return pipeline, and the liquid-phase outlet pipeline.

[0006] In the CO2 skid-mounted injection device according to some embodiments, there are multiple injection modules. The liquid phase out-of-tank pipeline includes multiple liquid phase out-of-tank branches, and the multiple liquid phase out-of-tank branches respectively connect the injection pumps of the multiple injection modules to the storage tank. The gas phase return-to-tank pipeline includes multiple gas phase return-to-tank branches, and the multiple gas phase return-to-tank branches respectively connect the injection pumps of the multiple injection modules to the storage tank. The liquid phase return-to-tank pipeline includes multiple liquid phase return-to-tank branches, and the multiple liquid phase return-to-tank branches respectively connect the injection pumps of the multiple injection modules to the storage tank. The liquid phase outlet pipeline includes multiple liquid phase outlet branches, and the multiple liquid phase outlet branches are respectively used to connect the injection pumps of the multiple injection modules to multiple oil wells; the heater and metering mechanism of each injection module are arranged on the corresponding liquid phase outlet branch. The regulating valve is provided on each liquid phase out-of-tank branch, each gas phase return-to-tank branch, each liquid phase return-to-tank branch, and each liquid phase outlet branch.

[0007] In some embodiments of the skid-mounted CO2 injection device, the storage tank module includes multiple storage tanks. The liquid-phase outlet pipeline further includes a first converging branch and multiple first branching branches. One end of the first converging branch communicates with the multiple storage tanks via the multiple first branching branches, and the other end of the first converging branch communicates with the multiple liquid-phase outlet branches. Each first branching branch is provided with the regulating valve.

[0008] In some embodiments of the skid-mounted CO2 injection apparatus, the liquid-phase outlet pipeline further includes a second converging branch and multiple second branching branches. One end of the second converging branch is connected to the injection pumps of the multiple injection modules via the multiple second branching branches, and the other end of the second converging branch is connected to the multiple liquid-phase outlet branches. Each second branching branch is provided with the regulating valve.

[0009] In the CO2 skid-mounted injection device according to some embodiments, the liquid phase out-of-tank pipeline, the gas phase back-to-tank pipeline, the liquid phase back-to-tank pipeline and the liquid phase outlet pipeline are all provided with safety valves.

[0010] In the CO2 skid-mounted injection device according to some embodiments, the storage tank module further includes a vent line connected to the storage tank and a safety valve provided on the vent line.

[0011] In the CO2 skid-mounted injection device according to some embodiments, the metering mechanism includes a flow meter and a flow regulating valve, and the flow regulating valve is disposed downstream of the flow meter.

[0012] In the CO2 skid-mounted injection device according to some embodiments, a polyurethane foam cold insulation layer is provided on the outside of the storage tank.

[0013] In the CO2 skid-mounted injection device according to some embodiments, the injection module further includes a frequency conversion cabinet and a frequency conversion motor mounted on the second skid, the frequency conversion motor is connected to the injection pump, and the frequency conversion cabinet is used to control the frequency conversion motor.

[0014] The beneficial effects of the present invention are as follows: The CO2 skid-mounted injection device of the present application can inject CO2 into oil wells and drive out oil, thereby improving the oil recovery rate. The present application can use the recovered CO2 to drive out oil, and after the CO2 is injected into the oil well, a portion of it is permanently sealed underground, thereby achieving underground storage of CO2 and reducing CO2 emissions. In addition, the storage tank module and injection module of the present application adopt a skid-mounted structure, which makes the CO2 injection device miniaturized and modular, and the CO2 skid-mounted injection device can be quickly moved and installed, realizing rapid injection of remote blocks and remote oil wells, and improving oil recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG2 is a schematic diagram of a CO2 skid-mounted injection device according to an embodiment of the present invention.

[0016] Figure 2 FIG2 is a schematic diagram of another embodiment of the CO2 skid-mounted injection device according to the present invention.

[0017] Figure 3 FIG2 is a schematic diagram of another embodiment of the CO2 skid-mounted injection device according to the present invention.

[0018] The description of the accompanying drawings is as follows:

[0019] 1 tank module

[0020] 11 First skid seat

[0021] 12 storage tanks

[0022] 13 Vent pipeline

[0023] 14 Feeding pipe

[0024] 2Injection module

[0025] 21 Second skid seat

[0026] 22 injection pump

[0027] 23 heater

[0028] 24Measuring institutions

[0029] 241 flow meter

[0030] 242 flow control valve

[0031] 3 connecting pipelines

[0032] 31 Liquid phase out-tank pipeline

[0033] 311 liquid phase out-tank branch

[0034] 312 First Busy Branch

[0035] 313 First Branch Road

[0036] 32 gas phase return tank pipeline

[0037] 321 gas phase return tank branch

[0038] 33 liquid phase return tank pipeline

[0039] 331 liquid phase return tank branch

[0040] 34 liquid phase outlet pipeline

[0041] 341 liquid phase outlet branch

[0042] 342 Second Confluence Branch

[0043] 343 Second Branch Road

[0044] 4 oil wells

[0045] 5. Safety valve

[0046] 6a-6n regulating valve DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0048] In the description of this application, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more (including two); unless otherwise specified or explained, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0049] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" described in the embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. The present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0050] Reference Figure 1 According to some embodiments, the CO2 skid-mounted injection device includes a storage tank module 1, an injection module 2, a connecting pipeline 3 and a regulating valve.

[0051] The storage tank module 1 includes a first skid 11 and a storage tank 12 mounted on the first skid 11. The storage tank 12 is used to store CO2. The storage tank 12 is a horizontal or vertical pressure tank for low-temperature storage. In some embodiments, the outer surface of the storage tank 12 is provided with a polyurethane foam insulation layer, the thickness of which is not less than 100 mm. The storage tank 12 is integrated on the first skid 11 for easy installation and movement. The CO2 is primarily contained in the storage tank 12 in liquid form and is maintained at approximately -20°C to -25°C and 2.0 MPa to 2.5 MPa.

[0052] The injection module 2 includes a second skid 21, an injection pump 22, a heater 23, and a metering mechanism 24, which are mounted on the second skid 21. The injection pump 22, heater 23, and metering mechanism 24 are integrally integrated into the second skid 21, forming a single unit for easy movement.

[0053] The connecting pipeline 3 connects the storage tank 12, the injection pump 22, the heater 23 and the metering mechanism 24. The connecting pipeline 3 includes multiple sections of pipelines and can connect the storage tank 12, the injection pump 22, the heater 23 and the metering mechanism 24 in sequence. The connecting pipeline can also be connected to the oil well, and the CO2 in the storage tank 12 can flow through the injection pump 22, the heater 23 and the metering mechanism 24 in sequence and flow into the oil well 4. The injection pump 22 can pressurize the CO2 to a set pressure (generally 10MPa-30MPa), the heater 23 is used to heat the CO2, and the metering mechanism 24 is used to measure the flow rate of CO2. In some embodiments, the metering mechanism 24 can also measure parameters such as the pressure and temperature of the CO2 in the connecting pipeline 3. The injection pump 22 can be a diaphragm pump.

[0054] The regulating valve is provided on the connecting pipeline 3 and is used to control the on-off of the connecting pipeline 3. The regulating valve is an electric regulating valve.

[0055] When oil needs to be driven out, the CO2 skid-mounted injection device of the present application is moved to the oil well, and the storage tank 12 of the storage tank module 1 and the injection pump 22, heater 23 and metering mechanism 24 of the injection module 2 are connected by the connecting pipeline 3, and one end of the connecting pipeline 3 is connected to the oil well.

[0056] The regulating valve on connecting pipeline 3 is opened, and the liquid CO2 (-20°C, 2.0 MPa) in storage tank 12 enters injection pump 22 through connecting pipeline 3 and is pressurized to 10 MPa to 30 MPa. It then flows into heater 23 and is heated to 0°C to 10°C. Finally, it is metered by metering mechanism 24 before entering the oil well. After the CO2 is injected into the oil well, the oil is driven out through supercritical extraction, swelling, and viscosity reduction.

[0057] The CO2 skid-mounted injection device of the present application can inject CO2 into oil wells and drive out oil, thereby improving the oil recovery rate. The present application can utilize the recovered CO2 to drive out oil, and after the CO2 is injected into the oil well, a portion of it is permanently sealed underground, thereby achieving underground storage of CO2 and reducing CO2 emissions. In addition, the storage tank module 1 and injection module 2 of the present application adopt a skid-mounted structure, which makes the CO2 injection device miniaturized and modular, and can realize the rapid movement and installation of the CO2 skid-mounted injection device, realize the rapid injection of remote blocks and remote oil wells, and improve oil recovery efficiency.

[0058] In some embodiments, the storage tank module 1 further includes a vent line 13 connected to the storage tank 12 and a safety valve 5 disposed on the vent line 13. In an emergency, the safety valve 5 opens, allowing the vent line 13 to vent the liquid CO2 in the storage tank 12, thereby reducing safety risks. The safety valve 5 is of the full-lift type.

[0059] In some embodiments, the storage tank module 1 further includes an inlet pipe 14 , and CO 2 collected from the outside can be injected into the storage tank 12 via the inlet pipe 14 .

[0060] In some embodiments, the injection module 2 includes a built-in variable frequency control system to control the injection speed and pressure of the injection pump 22. For example, the injection module 2 also includes a variable frequency cabinet and a variable frequency motor mounted on the second skid 21. The variable frequency motor is connected to the injection pump 22, and the variable frequency cabinet is used to control the variable frequency motor. The variable frequency cabinet can control the injection pump 22 via the variable frequency motor based on flow rate and other data fed back by the metering mechanism 24, achieving stepless adjustment of the injection volume.

[0061] In some embodiments, metering mechanism 24 includes a flow meter 241 and a flow control valve 242, with flow control valve 242 disposed downstream of flow meter 241. CO2 first enters flow meter 241 for metering, and then is regulated by flow control valve 242 before being directly injected into the wellhead of the oil well. Flow meter 241 may be a turbine flow meter.

[0062] The storage tank module 1 also includes a PLC control cabinet mounted on the first skid 11 to collect data on the storage tank 12's liquid level, pressure, temperature, and other parameters, with a reserved interface for uploading these data. The injection module 2 also includes a PLC control cabinet mounted on the second skid 21 to collect data on the injection pump's operating status, electrical parameters, inlet and outlet pressures, temperature, flow rate, and other parameters, with a reserved interface for uploading these data. The injection module 2 also features an emergency stop and high-pressure interlock pump stop switches, providing an overpressure pump shutdown function.

[0063] In some embodiments, the connecting pipeline 3 includes: a liquid phase out-tank pipeline 31 connecting the storage tank 12 and the injection pump 22; a gas phase return-tank pipeline 32 connecting the injection pump 22 and the storage tank 12; a liquid phase return-tank pipeline 33 connecting the injection pump 22 and the storage tank 12; and a liquid phase outlet pipeline 34 for connecting the injection pump 22 and the oil well 4. The heater 23 and the metering mechanism 24 are disposed on the liquid phase outlet pipeline 34. Regulating valves are provided on the liquid phase out-tank pipeline 31, the gas phase return-tank pipeline 32, the liquid phase return-tank pipeline 33, and the liquid phase outlet pipeline 34.

[0064] Specifically, refer to Figure 1 , regulating valve 6a on liquid phase out-tank line 31 opens, and liquid CO2 (-20 to -25°C, 2.0 to 2.5 MPa) inside storage tank 12 enters injection pump 22 via liquid phase out-tank line 31. When liquid CO2 first enters injection pump 22, a small amount of liquid CO2 vaporizes due to throttling. To prevent "gas lock," initially, regulating valve 6b on gas phase return-tank line 32 and regulating valve 6c on liquid phase return-tank line 33 are opened, while regulating valve 6d on liquid phase outlet line 34 is closed. At this point, the vaporized CO2 flows back into storage tank 12 via gas phase return-tank line 32 and liquid phase out-tank line 31. Once operation stabilizes, regulating valve 6d is first opened to 25% for a period of time (e.g., 15 minutes), then to 50% for a period of time (e.g., 15 minutes), and then to 100% while slowly closing regulating valve 6c. The regulating valve 6 b on the gas phase return tank pipeline 32 is in a normally open state to allow the gasified CO 2 to flow back to the storage tank 12 .

[0065] After the regulating valve 6d is opened, the CO2 pressurized by the injection pump 22 (10MPa to 30MPa) flows into the liquid phase outlet pipeline 34, and enters the oil well after being heated by the heater 23 and measured by the metering mechanism 24, thereby realizing oil recovery.

[0066] In some embodiments, a safety valve 5 is provided on each of the liquid phase out-tank pipeline 31, the gas phase return-tank pipeline 32, the liquid phase return-tank pipeline 33, and the liquid phase outlet pipeline 34. In an emergency, the safety valve 5 can vent the CO2 in the liquid phase out-tank pipeline 31, the gas phase return-tank pipeline 32, the liquid phase return-tank pipeline 33, and the liquid phase outlet pipeline 34, thereby reducing safety risks.

[0067] In some embodiments, reference Figure 2 , multiple injection modules 2 are provided. Multiple injection modules 2 can simultaneously inject CO2 into multiple oil wells, improving extraction efficiency and applicability. Depending on the number of oil wells, a corresponding number of injection modules 2 are connected to the storage tank module 1.

[0068] The liquid-phase out-of-tank pipeline 31 includes multiple liquid-phase out-of-tank branches 311, each of which connects the injection pumps 22 of the multiple injection modules 2 to the storage tank 12. The gas-phase return-to-tank pipeline 32 includes multiple gas-phase return-to-tank branches 321, each of which connects the injection pumps 22 of the multiple injection modules 2 to the storage tank 12. The liquid-phase return-to-tank pipeline 33 includes multiple liquid-phase return-to-tank branches 331, each of which connects the injection pumps 22 of the multiple injection modules 2 to the storage tank 12. The liquid-phase outlet pipeline 34 includes multiple liquid-phase outlet branches 341, each of which connects the injection pumps 22 of the multiple injection modules 2 to the multiple oil wells 4. The heater 23 and metering mechanism 24 of each injection module 2 are disposed on the corresponding liquid-phase outlet branch 341. In some embodiments, the number of liquid phase out-tank branches 311 , gas phase back-tank branches 321 , liquid phase back-tank branches 331 , liquid phase outlet branches 341 and injection modules 2 is the same.

[0069] A regulating valve is provided on each liquid phase out-of-tank branch 311 , each gas phase back-to-tank branch 321 , each liquid phase back-to-tank branch 331 and each liquid phase outlet branch 341 .

[0070] The multiple injection modules 2 shown are in parallel. Figure 2 When CO2 needs to be injected into one oil well, the regulating valve 6a is opened and the regulating valve 6e is closed, or the regulating valve 6e is opened and the regulating valve 6a is closed. When CO2 needs to be injected into two oil wells, the regulating valves 6a and 6e are opened at the same time.

[0071] In some embodiments, reference Figure 3 The storage tank module 1 is provided with a plurality of storage tanks 12. The plurality of storage tanks 12 are integrated into the first skid 11 to increase the storage capacity of CO2.

[0072] The liquid-phase out-of-tank pipeline 31 further includes a first converging branch 312 and multiple first branching branches 313. One end of the first converging branch 312 is connected to the multiple storage tanks 12 via the multiple first branching branches 313, and the other end of the first converging branch 312 is connected to the multiple liquid-phase out-of-tank branches 311. Each first branching branch 313 is equipped with a regulating valve.

[0073] This application can switch different working modes according to the number of oil wells and the demand for CO2 from the oil wells. Figure 3, taking two storage tanks 12 and two injection modules 2 as an example:

[0074] I) When there is only one oil well, one storage tank 12 and one injection module 2 are in operation; for example, the regulating valve 6a is opened, the regulating valve 6b is closed, the regulating valve 6c is opened, and the regulating valve 6d is closed.

[0075] II) When there are two oil wells and the demand for CO2 is low, one storage tank 12 and two injection modules 2 are in operation; for example, regulating valve 6a is open, regulating valve 6b is closed, regulating valve 6c is open, and regulating valve 6d is open.

[0076] III) When there are two oil wells and the demand for CO2 is high, two storage tanks 12 and two injection modules 2 are in operation; at this time, the regulating valves 6a, 6b, 6c, and 6d are all open.

[0077] IV) When there is only one oil well and the demand for CO2 is high, two storage tanks 12 and one injection module 2 are in operation; for example, regulating valve 6a is open, regulating valve 6b is open, regulating valve 6c is open, and regulating valve 6d is closed.

[0078] Of course, the number of storage tanks 12 and injection modules 2 is not limited to two, and may be more than three. In addition, each storage tank 12 may have 1-3 interfaces, each interface being used to connect to a corresponding injection module 2.

[0079] Reference Figure 3 In some embodiments, the liquid-phase outlet pipeline 34 further includes a second converging branch 342 and multiple second branching branches 343. One end of the second converging branch 342 is connected to the injection pumps 22 of the multiple injection modules 2 via the multiple second branching branches 343, and the other end of the second converging branch 342 is connected to the multiple liquid-phase outlet branches 341. The number of second branching branches 343 is the same as the number of injection pumps 22. Each second branching branch 343 is equipped with a regulating valve.

[0080] By setting up the second converging branch 342 and multiple second diverting branches 343, the present application can switch different working modes according to the number of oil wells and the amount of CO2 used by the oil wells. Figure 3 , this application uses two injection modules 2 and two oil wells as an example:

[0081] I) When there is only one oil well, one injection pump 22 is working; for example, the regulating valve 6j is opened, the regulating valve 6i is closed, the regulating valve 6L is opened, and the regulating valve 6k is closed.

[0082] II) When there are two oil wells and the demand for CO2 is low, one injection pump 22 is in operation; for example, regulating valve 6j is opened, regulating valve 6i is closed, regulating valve 6L is opened, and regulating valve 6k is opened.

[0083] III) When there are two oil wells and the demand for CO2 is high, the two injection pumps 22 are in operation; at this time, the regulating valves 6i, 6j, 6L, and 6k are all open.

[0084] IV) When there is only one oil well and the demand for CO2 is high, two injection pumps 22 are in operation; for example, regulating valve 6j is opened, regulating valve 6i is opened, regulating valve 6L is opened, and regulating valve 6k is closed.

[0085] Of course, the number of injection pumps 22 is not limited to two, and may be three or more.

Claims

1. A CO2 skid-mounted injection device, characterized in that: Including storage tank module, injection module, connecting pipeline and regulating valve; The storage tank module includes a first skid and a storage tank mounted on the first skid, wherein the storage tank is used to contain CO2; The injection module includes a second skid, an injection pump, a heater and a metering mechanism, wherein the injection pump, the heater and the metering mechanism are installed on the second skid; The connecting pipeline connects the storage tank, the injection pump, the heater and the metering mechanism, and can be connected to an oil well; the CO2 in the storage tank can flow through the injection pump, the heater and the metering mechanism in sequence and flow into the oil well; The regulating valve is provided on the connecting pipeline and is used to control the on-off of the connecting pipeline; The connecting pipelines include: a liquid phase out-tank pipeline connecting the storage tank and the injection pump; a gas phase return-tank pipeline connecting the injection pump and the storage tank; a liquid phase return-tank pipeline connecting the injection pump and the storage tank; and a liquid phase outlet pipeline for connecting the injection pump and the oil well; The heater and the metering mechanism are arranged on the liquid phase outlet pipeline; The regulating valve is provided on the liquid phase out-tank pipeline, the gas phase back-tank pipeline, the liquid phase back-tank pipeline and the liquid phase outlet pipeline; There are multiple injection modules; The liquid phase out-tank pipeline comprises a plurality of liquid phase out-tank branches, and the plurality of liquid phase out-tank branches respectively connect the injection pumps of the plurality of injection modules to the storage tank; The gas phase return tank pipeline includes a plurality of gas phase return tank branches, and the plurality of gas phase return tank branches respectively connect the injection pumps of the plurality of injection modules to the storage tank; The liquid phase return tank pipeline includes a plurality of liquid phase return tank branches, and the plurality of liquid phase return tank branches respectively connect the injection pumps of the plurality of injection modules to the storage tank; The liquid phase outlet pipeline includes a plurality of liquid phase outlet branches, each of which is used to connect the injection pumps of the plurality of injection modules to a plurality of oil wells; the heater and metering mechanism of each injection module are arranged on the corresponding liquid phase outlet branch; The regulating valve is provided on each liquid phase out-of-tank branch, each gas phase back-to-tank branch, each liquid phase back-to-tank branch and each liquid phase outlet branch; The storage tank module is provided with a plurality of storage tanks; The liquid phase out-of-tank pipeline further includes a first converging branch and a plurality of first branching branches, one end of the first converging branch is connected to the plurality of storage tanks respectively via the plurality of first branching branches, and the other end of the first converging branch is connected to the plurality of liquid phase out-of-tank branches; Each first branch is provided with the regulating valve; A polyurethane foam cold-insulating layer is provided on the outside of the storage tank.

2. The CO2 skid-mounted injection device according to claim 1, characterized in that: The liquid phase outlet pipeline further includes a second converging branch and a plurality of second branching branches, one end of the second converging branch is connected to the injection pumps of the plurality of injection modules via the plurality of second branching branches, and the other end of the second converging branch is connected to the plurality of liquid phase outlet branches; Each second flow branch is provided with the regulating valve.

3. The CO2 skid-mounted injection device according to claim 1, characterized in that: The liquid phase out-tank pipeline, the gas phase back-tank pipeline, the liquid phase back-tank pipeline and the liquid phase outlet pipeline are all provided with safety valves.

4. The CO2 skid-mounted injection device according to claim 1, characterized in that: The storage tank module further includes a vent line connected to the storage tank and a safety valve arranged on the vent line.

5. The CO2 skid-mounted injection device according to claim 1, characterized in that: The metering mechanism includes a flow meter and a flow regulating valve, and the flow regulating valve is arranged downstream of the flow meter.

6. The CO2 skid-mounted injection device according to claim 1, characterized in that: The injection module further includes a frequency conversion cabinet and a frequency conversion motor installed on the second skid. The frequency conversion motor is connected to the injection pump, and the frequency conversion cabinet is used to control the frequency conversion motor.

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