Pipe network pressure stabilizing and degassing device of liquid carbon dioxide pressure injection system

Abstract

The utility model discloses a liquid carbon dioxide pressure injection system pipe network pressure stabilizing and degassing device which comprises a shell, a base end cover is arranged at the bottom of the shell, a shell top cover is arranged at the arc-shaped top, a bottom tee joint is arranged below the shell, and a center outlet of the bottom tee joint is connected with a center opening of the base end cover; the first chamber is located at the bottom of an inner cavity of the shell, a bottom piston is arranged above the first chamber, and two reverse one-way valves which are communicated upwards are symmetrically arranged on the bottom piston; the second chamber is located above the bottom piston, and a floating piston is arranged above the second chamber; a variable cavity is arranged above the floating piston; the bottom of the air bag is elastically connected with the floating piston, and the top of the air bag abuts against the lower portion of the top center hole of the shell. And the top automatic overflow valve is embedded in a center hole in the top wall of the shell top cover. The pipe network pressure-stabilizing degassing device for the liquid carbon dioxide pressure injection system can eliminate the influence of carbon dioxide gasification on the pump, meanwhile, the stable operation of the high-pressure pressure injection pump and the liquid feeding shield pump is effectively guaranteed, unattended operation is truly achieved, and the safety and reliability of the system are improved.

Description

Technical Field

[0001] This utility model relates to a liquid carbon dioxide injection system, and more particularly to a pressure stabilization and degassing device for a liquid carbon dioxide injection system pipeline, belonging to the technical field of carbon dioxide injection equipment. Background Technology

[0002] Liquid carbon dioxide injection into gas injection wells is a crucial technical measure for oilfield development, evaluation, and production enhancement. In low-permeability oilfields, carbon dioxide injection replenishes formation energy. When carbon dioxide dissolves in crude oil, the oil expands in volume, decreases viscosity, and increases fluidity. When dissolved in water, it becomes slightly acidic, reacting with the formation matrix to increase formation permeability, thereby reducing injection pressure and improving liquid supply capacity. Oilfield carbon dioxide injection systems typically use a plunger-type high-pressure pump to inject liquid carbon dioxide into the wellbore, which then travels through the downhole tubing to the target formation, driving the remaining crude oil towards the production well.

[0003] A typical carbon dioxide ground injection system mainly consists of a carbon dioxide storage tank, pipelines, a feed pump (usually a booster pump located upstream of the high-pressure injection pump), a high-pressure injection pump, and a heating system. Because liquid carbon dioxide has a low vaporization temperature, a small portion easily vaporizes into carbon dioxide gas in the pipeline when passing through valves and accessories in the process. Without compression and cooling, this carbon dioxide gas is difficult to re-liquefy. Over time, carbon dioxide gas accumulates in the pipeline, affecting pump suction. This manifests as reduced pump efficiency or even failure to pump liquid. Furthermore, it is difficult to achieve a perfect match between the existing high-pressure injection pump and the feed pump, often resulting in the feed pump operating at high pressure for extended periods, impacting its lifespan and accelerating its failure. As the injection volume increases rapidly, the liquid carbon dioxide storage tank is prone to freezing and ice blockage.

[0004] To address the above issues, the main current measures are: 1. Adding a larger-capacity feed pump to the front end of the high-pressure injection pump to pressurize the front end and prevent carbon dioxide from being degassed under strong self-priming of the high-pressure pump suction valve assembly; 2. Appropriately increasing the diameter of the inlet pipeline to the high-pressure injection pump (or feed pump), shortening its length, and reducing bends to reduce the frictional resistance of the pipeline network; 3. By installing multiple venting pipelines in the pump's inlet pipeline, some of the degassed carbon dioxide gas can be returned to the carbon dioxide storage tank, although this is difficult to control in actual operation. These measures are affected by the overall design of the carbon dioxide ground skid system and cannot be fully implemented. Even if implemented, they can only reduce the frequency of cavitation, not completely prevent cavitation in the high-pressure injection pump. Once cavitation occurs, pump efficiency will be severely reduced, such as pumps failing to pump liquid. To avoid accelerated equipment wear due to poor pump liquid supply, the injection system must be shut down for maintenance when the equipment wears to a certain extent. During maintenance, liquid and gaseous carbon dioxide in the process need to be discharged, resulting in resource waste and increasing the risk of personnel asphyxiation. 4. Although the on-site liquid carbon dioxide storage tank adopts a double-walled insulated tank, it is still difficult to achieve pressure balance inside the tank, resulting in frequent tripping of the safety valve. When a large discharge occurs, the tank and the output pipeline are prone to freezing. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] The purpose of this utility model is to overcome the problems existing in the prior art and provide a pressure stabilizing and degassing device for a liquid carbon dioxide injection system pipeline. An automatic pressure stabilizing and degassing device is installed between the inlet end of the high-pressure injection pump and the outlet of the feeding shielded pump. This can eliminate the impact of carbon dioxide vaporization on the pump, and at the same time effectively ensure the stable operation of the high-pressure injection pump and the feeding shielded pump, truly achieving unattended operation and increasing the safety and reliability of the system.

[0007] To solve the above technical problems, the present invention provides a liquid carbon dioxide injection system pipeline pressure stabilization and degassing device, comprising:

[0008] The housing has a base end cap at the bottom, a housing top cap at the arc-shaped top, and a bottom tee at the bottom, with the center outlet of the bottom tee connected to the center opening of the base end cap.

[0009] The first chamber is located at the bottom of the inner cavity of the shell, and a bottom piston is provided above it. Two upward-directing reverse one-way valves are symmetrically provided on the bottom piston.

[0010] The second chamber is located above the bottom piston, and a floating piston is located above it; above the floating piston is the variable chamber.

[0011] The airbag is elastically connected to the floating piston at the bottom and rests against the bottom of the central hole at the top of the housing.

[0012] The top automatic overflow valve is embedded in the center hole of the top wall of the housing cover.

[0013] Furthermore, the upper inner wall of the housing is provided with a spiral air-guiding rubber pad, and the inner wall of the spiral air-guiding rubber pad is provided with a guide groove extending upward along the spiral line.

[0014] Furthermore, the bottom piston is fixedly connected to an upwardly extending central shaft, the middle section of which passes through the central hole of the floating piston, and the upper end of which is inserted into the lower port of the floating sleeve. A support for the airbag is welded to the top of the floating sleeve.

[0015] Furthermore, an airbag support is provided above the support, and a boss is provided at the center of the upper surface of the support to be embedded in the airbag support.

[0016] Furthermore, the airbag support has a rubber pad with an enlarged area at the top and a downward concave center, and the bottom of the airbag is supported by the concave arc center of the rubber pad.

[0017] Furthermore, the top cover of the housing has a cylindrical structure with an open bottom, and its lower end is screwed onto the upper outer periphery of the housing via an internal thread. The central hole at the top of the housing communicates with the inner cavity of the top cover.

[0018] Furthermore, the top of the airbag is provided with an airbag connector, and an inflation valve is installed in the airbag connector. The upper end of the inflation valve is located in the inner cavity of the shell top cover.

[0019] Furthermore, the two ends of the bottom tee are connected between the inlet of the high-pressure injection pump and the outlet of the feeding shield pump.

[0020] Furthermore, the lower side wall outlet of the housing is connected to a degassing gate valve. The inlet of the degassing gate valve is connected to the first chamber, and the outlet pipe is connected to the lower port of the degassing quick valve through an elbow. The upper port of the degassing quick valve is connected to the middle port of the degassing tee, and the top outlet of the top automatic overflow valve is connected to one side port of the degassing tee.

[0021] Furthermore, the other port of the degassing tee is connected to the inlet of the gas phase gate valve of the storage tank via a degassing check valve.

[0022] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. It can collect and eliminate the gas released from the liquid carbon dioxide that is gradually formed in the pipeline between the high-pressure injection pump and the feeding shielded pump in the carbon dioxide injection system online; it can automatically open the backflow through the pressure regulating valve and automatically remove the gaseous carbon dioxide in the pipeline without stopping the machine.

[0023] 2. It can improve the pressure stabilization of large capacity pumps and achieve dynamic matching of the liquid supply output of the feeding shielded pump and the suction of the variable frequency high-pressure injection pump during operation; when the feeding shielded pump or high-pressure injection pump stops due to a sudden failure, it can control the system, buy time for handling the failure, and enhance the safety and reliability of the system operation.

[0024] 3. It can effectively avoid the serious decline in pump efficiency caused by cavitation, such as pump failure, and prevent equipment failures such as accelerated wear of equipment due to poor liquid supply from the feed canned pump or valve group wear of the high-pressure injection pump due to poor liquid supply. It greatly reduces the intensity of inspection; avoids system shutdown caused by the above failures, and improves the continuity and stability of injection; avoids carbon dioxide emission losses caused by system shutdown operations; and avoids production risks caused by increased maintenance operations.

[0025] 4. Establish safety monitoring of the pipeline network and equipment in the injection system to ensure the safety and reliability of the system, realize interlocking control, and achieve unattended operation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0027] Figure 1 A flowchart of a liquid carbon dioxide injection system;

[0028] Figure 2 This is a front view of the automatic pressure-stabilizing degassing device of this utility model;

[0029] Figure 3 for Figure 2 A sectional view;

[0030] In the diagram: B1. Shielded feeding pump; B2. High-pressure injection pump; C1. Carbon dioxide storage tank; L1. Filter; TJ. Electric heating unit; PT. Pressure transmitter; TT. Temperature transmitter;

[0031] V1. Tank outlet valve; V2. Tank vapor phase gate valve; V3. Electric ball valve; V4. Injection pump outlet gate valve; V5. Injection pump reflux gate valve; V6. Pressure reducing valve; V7. Dispensing valve assembly;

[0032] Automatic pressure stabilizing degasser: 1. Bottom tee; 2. Base end cap; 3. Housing; 4. Housing top cover; 5. First chamber; 6. Reverse check valve; 7. Bottom piston; 8. Second chamber; 9. Floating piston; 10. Central shaft; 11. Floating sleeve; 12. Variable chamber; 13. Spring; 14. Intermediate gasket; 15. Support; 16. Airbag support; 17. Rubber liner; 18. Airbag; 19. Airbag connector; 20. Inflation valve; 21. Spiral air guide rubber pad; 22. Top automatic overflow valve; 23. Degasser gate valve; 24. Degasser quick valve; 25. Degasser tee; 26. Degasser check valve. Detailed Implementation

[0033] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0034] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0036] like Figure 1 As shown, the liquid carbon dioxide injection system includes a carbon dioxide storage tank C1, a feeding shielded pump B1, a high-pressure injection pump B2, and a distribution valve assembly V7. A storage tank outlet valve V1 is installed at the bottom outlet of the carbon dioxide storage tank C1. The outlet of the storage tank outlet valve V1 is connected to the inlet of the feeding shielded pump B1 via a filter L1. The outlet of the feeding shielded pump B1 is connected to the inlet of the high-pressure injection pump B2 via an electric ball valve V3. A pressure transmitter PT, a temperature transmitter TT, and an automatic pressure stabilizing degasser are installed on the pipeline between the outlet of the electric ball valve V3 and the inlet of the high-pressure injection pump B2. The bottom tee 1 of the automatic pressure stabilizing degasser is installed between the outlet of the feeding shielded pump B1 and the inlet pipeline of the high-pressure injection pump B2, with the medium flowing from end A to end B.

[0037] The outlet of the high-pressure injection pump B2 is equipped with an injection pump outlet gate valve V4, and the main pipeline of the outlet of injection pump outlet gate valve V4 is connected to the distribution valve group V7. The outlet pipeline of the high-pressure injection pump B2 is also equipped with an injection pump return gate valve V5, and the outlet of injection pump return gate valve V5 is connected to the storage tank vapor phase gate valve V2 at the bottom of carbon dioxide storage tank C1 through a pressure reducing valve V6. The outlet pipeline of storage tank vapor phase gate valve V2 is connected to the vapor phase space of carbon dioxide storage tank C1.

[0038] Liquid carbon dioxide flowing out of carbon dioxide storage tank C1 enters the feeding shielded pump B1 through the storage tank outlet valve V1. After being pressurized by the feeding shielded pump B1, it enters the high-pressure injection pump B2 through the electric ball valve V3. After being pressurized by the high-pressure injection pump B2, it enters the distribution valve group V7, passes through the electric heating unit TJ, and is finally distributed to the injection well.

[0039] During normal operation, the backflow in the pipeline is controlled by a combination of an automatic pressure regulator and an electric ball valve V3 to quickly replenish the gas phase pressure in the carbon dioxide storage tank C1, thereby achieving a balance between the gas and liquid phase pressures in the carbon dioxide storage tank C1 and preventing freezing inside the tank and ice blockage in the outlet pipeline. The instruments and electric control valves in the injection system are configured to achieve interlocked control.

[0040] like Figure 2 , Figure 3 As shown, the automatic pressure stabilizing degasser includes a housing 3, a base end cover 2 at the bottom of the housing 3, a housing top cover 4 at the arc-shaped top of the housing 3, and a bottom tee 1 at the bottom of the housing 3. The center outlet of the bottom tee 1 is connected to the center opening of the base end cover 2.

[0041] The bottom of the inner cavity of the housing 3 is provided with a first chamber 5. A bottom piston 7 is provided above the first chamber 5. Two upward-directing one-way valves 6 are symmetrically provided on the bottom piston 7. A second chamber 8 is provided above the bottom piston 7. A floating piston 9 is provided above the second chamber 8. A central shaft 10 extending upward is fixedly connected to the center of the bottom piston 7. The middle section of the central shaft 10 passes through the central hole of the floating piston 9. The upper end of the central shaft 10 is inserted into the lower port of the floating sleeve 11. A support 15 is welded to the top of the floating sleeve 11. The support 15 has a circular flash that extends beyond the outer wall of the floating sleeve 11. A spring 13 is fitted around the outer periphery of the floating sleeve 11. The spring 13 is supported between the support 15 and the top wall of the floating piston 9. Two sets of springs 13 can be provided, separated by an intermediate gasket 14. The space above the floating piston 9 is a variable chamber 12.

[0042] An airbag support 16 is provided above the support 15. A boss is provided at the center of the upper surface of the support 15 and is embedded in the airbag support 16, forming a whole with the airbag support 16. A rubber pad 17 with an enlarged area and a downward concave center is provided on the upper part of the airbag support 16. The bottom of the airbag 18 is supported on the concave arc center of the rubber pad 17.

[0043] A spiral air-guiding rubber pad 21 is attached to the upper inner wall of the housing 3. The inner wall of the spiral air-guiding rubber pad 21 is provided with a guide groove extending upward along the spiral line. When the airbag support 16 lifts upward to compress the airbag 18, the outer wall of the airbag 18 will adhere to the inner wall of the spiral air-guiding rubber pad 21. At this time, the gaseous or liquid carbon dioxide in the variable chamber 12 can still rise to the inner cavity of the housing top cover 4 along the guide groove on the inner wall of the spiral air-guiding rubber pad 21.

[0044] The top cover 4 of the housing has a cylindrical structure with an open bottom. The lower end of the top cover 4 is screwed onto the upper outer periphery of the housing 3 by internal thread. The central hole at the top of the housing 3 communicates with the inner cavity of the top cover 4. An automatic overflow valve 22 is embedded in the central hole at the top wall of the top cover 4.

[0045] A degassing gate valve 23 is connected to the outlet of the lower side wall of the shell 3. The inlet of the degassing gate valve 23 is connected to the first chamber 5. The outlet pipe of the degassing gate valve 23 is connected to the lower port of the degassing quick valve 24 via an elbow. The upper port of the degassing quick valve 24 is connected to the middle port of the degassing tee 25. The top outlet of the top automatic overflow valve 22 is connected to one side port of the degassing tee 25. The other side port of the degassing tee 25 is connected via a degassing check valve 26 and a degassing pipe. The degassing pipe is connected to the inlet of the gas phase gate valve V2 of the storage tank.

[0046] The top of the airbag 18 is equipped with an airbag connector 19, and an inflation valve 20 is installed in the airbag connector 19. After the airbag 18 has been in operation for a long time, some changes may occur, such as inflation. In this case, the inflation valve 20 can be used to replenish the pressure and ensure that the original pressure inside the airbag 18 remains unchanged. The upper end of the inflation valve 20 is located in the inner cavity of the top cover 4 of the housing.

[0047] The liquid carbon dioxide injection system first goes through a cooling mode, then a startup mode, and finally enters the operating mode.

[0048] Cooling Mode: Before starting the feed pump B1 and high-pressure injection pump B2, the pipeline and components need to be cooled to ensure that all pipes and pump chambers in the pipeline process are filled with cryogenic liquid fluid. The cooling process is as follows: Close the injection pump outlet gate valve V4, open the injection pump return gate valve V5 on the outlet pipeline of high-pressure injection pump B2, and cryogenic gaseous carbon dioxide enters the feed pump B1, automatic pressure stabilizing degasser, and high-pressure injection pump B2 sequentially through the connecting pipeline to initially cool the components in the process. Then, close the storage tank gas phase gate valve V2 and open the storage tank liquid outlet valve V1 to allow the cryogenic liquid carbon dioxide to fill all components according to the cooling process. When the injection pump return gate valve V5 is completely filled with liquid carbon dioxide, close the injection pump return gate valve V5, and the cooling and filling process of the pipeline and pump is completed.

[0049] Start-up mode: After the feeding shielded pump B1, high-pressure injection pump B2, and pipeline are filled with liquid carbon dioxide, start the feeding shielded pump B1. When its outlet pressure reaches 2.2MPa, start the high-pressure injection pump B2 and simultaneously open the degasser gate valve 23 and slightly open the degasser quick valve 24. After running for one to two minutes, close the degasser gate valve 23 and the degasser quick valve 24. Increase the operating frequency of the high-pressure injection pump B2. When its outlet pressure is greater than 2.6MPa, close the injection pump return gate valve V5 and open the injection pump outlet gate valve V4 connected to the injection pipeline.

[0050] Operating mode: such as Figure 2 As shown, during operation, liquid carbon dioxide flows from port A to port B of the bottom tee 1. The first chamber 5, connected to the middle outlet of the bottom tee 1, continuously absorbs the pressure difference between the outlet of the feeding shielded pump B1 and the inlet of the high-pressure injection pump B2. The two reverse check valves 6 on the bottom piston 7 are opened, and the liquid carbon dioxide in the second chamber 8 is continuously filled. At the same time, a trace amount of gaseous carbon dioxide is added to the top of the first chamber 5. Under the action of the liquid carbon dioxide in the second chamber 8, the floating piston 9 compresses the spring 13 upwards. The spring 13 compresses the airbag 18 upwards through the connected airbag support 16. When the pipeline pressure fluctuates within a certain range, the components such as the first chamber 5, the second chamber 8, the bottom piston 7, and the floating piston 9 in the device will automatically absorb and release the pressure fluctuations in the pipeline to ensure stable pipeline pressure.

[0051] During operation, when the liquid supply of the feeding shielded pump B1 is much greater than the actual demand of the high-pressure injection pump B2, the first chamber 5 and the second chamber 8 will continuously absorb liquid. The bottom piston 7 and the floating piston 9 will work together with the airbag support 16 to compress the airbag 18, and the variable chamber 12 will shrink. When the floating piston 9 is higher than the middle position of the housing 3, the spiral air guide rubber pad 21 in the housing 3 will guide the gas and liquid carbon dioxide in the top of the second chamber 8 to the top space through the air guide groove. When the pressure at port B of the bottom three-way valve 1 reaches 2.8 MPa, the top automatic overflow valve 22 will open and discharge the gas-liquid mixture into the gas phase space of the carbon dioxide storage tank C1 through the degassing one-way valve 26, thus realizing the function of automatic degassing and reflux.

[0052] When the operating frequency of the high-pressure injection pump B2 increases, its demand increases, and the liquid volume in the chamber of the device decreases. When the floating piston 9 moves down to the middle position, it closes the liquid supply to the variable chamber 12. After the pressure in the variable chamber 12 drops, the top automatic overflow valve 22 closes.

[0053] During this process, pressure parameters are set to automatically adjust the pipeline pressure and automatically discharge excess liquid carbon dioxide. This process ensures stable pressure, automatic venting, and automatic reflux.

[0054] Automatic pressure regulators and degassers can automatically eliminate gaseous carbon dioxide generated in pipelines, automatically stabilize the pressure in the pipeline network, automatically collect backflow carbon dioxide, automatically adjust the balance of liquid and gas two-phase pressure in the storage tank, automatically realize automatic shutdown and safety control in case of failure, realize a safe and reliable operation mechanism with micro-automatic adjustment and automatic shutdown interlock in case of failure, and truly achieve unattended operation.

[0055] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A liquid carbon dioxide pressurization system pipe network pressure stabilizing degassing device, characterized by, include: The housing (3) has a base end cap (2) at its bottom and a housing top cap (4) at its arc-shaped top. A bottom tee (1) is provided below the housing. The center outlet of the bottom tee (1) is connected to the center opening of the base end cap (2). The first chamber (5) is located at the bottom of the inner cavity of the shell (3), and a bottom piston (7) is provided above it. Two upward-conducting reverse one-way valves (6) are symmetrically provided on the bottom piston (7). The second chamber (8) is located above the bottom piston (7), and a floating piston (9) is provided above it; above the floating piston (9) is the variable chamber (12). The airbag (18) is elastically connected to the bottom of the floating piston (9) and rests against the bottom center hole of the housing (3); The top automatic overflow valve (22) is embedded in the center hole of the top wall of the housing top cover (4).

2. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 1, characterized in that: The upper inner wall of the housing (3) is provided with a spiral air-guiding rubber pad (21), and the inner wall of the spiral air-guiding rubber pad (21) is provided with a guide groove extending upward along the spiral line.

3. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 1, characterized in that: The bottom piston (7) is fixedly connected to an upwardly extending central shaft (10). The middle section of the central shaft (10) passes through the central hole of the floating piston (9). The upper end of the central shaft (10) is inserted into the lower port of the floating sleeve (11). The top of the floating sleeve (11) is welded with a support (15) for supporting the airbag (18).

4. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 3, characterized in that: An airbag support (16) is provided above the support (15), and a boss is provided at the center of the upper surface of the support (15) to be embedded in the airbag support (16).

5. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 4, characterized in that: The airbag support (16) has a rubber pad (17) with an enlarged area at the top and a downward concave center, and the bottom of the airbag (18) is supported by the concave arc center of the rubber pad (17).

6. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 1, characterized in that, The top cover (4) of the housing has a cylindrical structure with an open bottom. Its lower end is screwed onto the upper outer periphery of the housing (3) by internal thread. The central hole at the top of the housing (3) is connected to the inner cavity of the top cover (4).

7. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 6, characterized in that, The top of the airbag (18) is provided with an airbag connector (19), and an inflation valve (20) is installed in the airbag connector (19). The upper end of the inflation valve (20) is located in the inner cavity of the shell top cover (4).

8. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 1, characterized in that, The two ends of the bottom tee (1) are connected between the inlet of the high-pressure injection pump and the outlet of the feeding shield pump.

9. The liquid carbon dioxide injection system pipeline pressure stabilization and degassing device according to claim 1, characterized in that, The lower side wall outlet of the housing (3) is connected to a degassing gate valve (23). The inlet of the degassing gate valve (23) is connected to the first chamber (5). The outlet pipe is connected to the lower port of the degassing quick valve (24) through an elbow. The upper port of the degassing quick valve (24) is connected to the middle port of the degassing tee (25). The top outlet of the top automatic overflow valve (22) is connected to one side port of the degassing tee (25).

10. The liquid carbon dioxide pressurization system pipe network pressure stabilizing and degassing device according to claim 9, characterized in that, The other port of the degassing tee (25) is connected to the inlet of the gas phase gate valve (V2) of the storage tank via a degassing check valve (26).

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