Quantitative injection device for carbon dioxide flooding

Abstract

The application relates to the technical field of deep-sea oil drilling equipment manufacturing, and discloses a quantitative injection device for carbon dioxide oil displacement, which comprises a liquid storage tank and a support, the top end of the liquid storage tank is provided with an extraction assembly, the top end of the support is fixedly connected with a temporary storage box, the inside of the temporary storage box is provided with an air bag, the rear end of the temporary storage box is fixedly connected with an output pipe, the other end of the output pipe is installed at the output end of the extraction assembly, the top end inner wall of the air bag is slidably connected with a sliding rod, the bottom end of the sliding rod is fixedly connected with a bottom disc in contact with the outside of the air bag, the outside of the sliding rod is provided with a compression spring, the top end of the temporary storage box is provided with an extension assembly, and one end of the extension assembly is provided with a pull rope. In the application, the liquid carbon dioxide compressed by the vacuum pump is temporarily stored and buffered by the temporary storage box and the air bag, high-pressure impact on the output pipeline and the injection component is avoided, the problem of breakage and aging is reduced, the service life of the equipment is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of deep-sea oil drilling equipment manufacturing technology, and in particular to a quantitative injection device for carbon dioxide flooding. Background Technology

[0002] In existing technologies, the deep-sea environment acts as a natural barrier. In waters with an average depth exceeding 2000 meters, equipment must withstand pressures exceeding 200 atmospheres and temperatures below 4°C. Coupled with the synergistic corrosion from seawater, hydrogen sulfide, and other media, this presents a triple challenge to the material properties, structural strength, and sealing technology of drilling equipment. Particularly in the low-temperature environment of the deep sea, ordinary metal materials exhibit brittleness, and the elasticity and aging resistance of seals decrease significantly. Furthermore, highly corrosive media accelerate the wear and tear of critical equipment components, making deep-sea oil extraction face extremely high technical barriers and cost risks.

[0003] Meanwhile, traditional oilfield extraction technologies, after long-term operation, generally reach a bottleneck of 30%-40% recovery rate. Against this backdrop, carbon dioxide enhanced oil recovery (CO2-EOR) technology has emerged as a powerful alternative with a dual advantage: Firstly, the injection of supercritical carbon dioxide into the oil reservoir can reduce crude oil viscosity by over 90%, and through multiple effects such as expanding crude oil volume and displacing residual oil, it can increase the recovery rate to over 60%. Taking a pilot project as an example, the adoption of CO2-EOR technology has resulted in an average 50% increase in crude oil production per well, demonstrating significant economic benefits. Secondly, for every ton of additional crude oil produced, 0.5-1.2 tons of carbon dioxide can be stored. This technology not only helps oil and gas companies achieve their carbon emission reduction targets but also generates additional revenue through carbon trading, achieving a win-win situation for energy development and environmental protection.

[0004] However, in existing technologies, the injection stage of carbon dioxide enhanced oil recovery (CEOR) operations mostly adopts a direct extraction and continuous injection method, lacking an effective pressure buffering mechanism. Traditional equipment typically connects a storage tank directly to a vacuum pump, and then delivers compressed liquid carbon dioxide directly to the injection end through pipelines. The high-pressure fluid flows at high speed in the pipeline, continuously impacting the inner wall of the pipeline, which can easily lead to localized stress concentration, causing problems such as pipeline rupture and weld cracking. In addition, due to the lack of temporary storage and pressure regulation devices, when the output pressure of the vacuum pump fluctuates, the pressure and flow rate at the injection end will also become unstable, which not only affects the oil recovery effect but also accelerates the wear and aging of seals, leading to safety hazards such as seal failure and fluid leakage. Furthermore, the direct injection method keeps the various components of the equipment under high-pressure load for a long time, shortening the overall service life, increasing the frequency of equipment maintenance and replacement, significantly increasing operating costs and downtime, and making it difficult to meet the needs of long-term stable operation in oil fields.

[0005] Therefore, a quantitative injection device for carbon dioxide flooding is proposed to address the above problems. Summary of the Invention

[0006] To overcome the above shortcomings, the present invention provides a quantitative injection device for carbon dioxide flooding, which aims to improve the problems of existing carbon dioxide flooding injection devices, which mostly adopt direct extraction and continuous injection methods, lack pressure buffering, are prone to pipeline rupture and seal aging, have high equipment pressure, short service life, high maintenance costs, and are difficult to meet the needs of stable oilfield operations.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A quantitative injection device for carbon dioxide flooding includes a storage tank and a support. An extraction component is installed at the top of the storage tank. A temporary storage box is fixedly connected to the top of the support. An air bladder is installed inside the temporary storage box. An output pipe is fixedly connected to the rear end of the temporary storage box. The other end of the output pipe is installed at the output end of the extraction component. A sliding rod is slidably connected to the inner wall of the top of the air bladder. A base plate that contacts the outside of the air bladder is fixedly connected to the bottom end of the sliding rod. A pressure spring is sleeved on the outside of the sliding rod. A telescopic component is installed at the top of the temporary storage box. A pull rope is installed at one end of the telescopic component. A rotating roller is fixedly connected to the other end of the pull rope. A rotating shaft is fixedly connected to the rear end of the rotating roller. A ball valve is fixedly connected to the outside of the rotating shaft. A ball tube is rotatably connected to the outside of the ball valve. A reset component is installed at the front end of the ball tube.

[0009] As a further description of the above technical solution:

[0010] The extraction assembly includes a feed pipe, the bottom end of which is mounted on the top left side of the storage tank via a flange, and an extraction pipe mounted on the top right side of the storage tank via a flange. A motor is fixedly connected to the top of the bracket, and a vacuum pump is fixedly connected to the drive end of the motor. The other end of the extraction pipe is mounted on the input end of the vacuum pump via a flange, and the other end of the output pipe is fixedly connected to the output end of the vacuum pump.

[0011] As a further description of the above technical solution:

[0012] One end of the pressure spring is fixedly connected to one side of the chassis, and the other end of the pressure spring is fixedly connected to one side of the inner wall of the temporary storage box.

[0013] As a further description of the above technical solution:

[0014] The telescopic assembly includes an inner column one, one end of which is rotatably connected to the top of the slide rod. An outer column fixed to the top of the temporary storage box is slidably connected to the outside of the inner column one. An inner column two is slidably connected to the other side of the outer column. Limit blocks are fixedly connected to the adjacent sides of the outer column and the inner column two. One end of the pull rope is rotatably connected to the other end of the inner column two.

[0015] As a further description of the above technical solution:

[0016] The outside of the rotating roller is provided with a threaded groove for winding the pull rope, and two anti-detachment rings are fixedly connected to the outside of the rotating roller to prevent the pull rope from accidentally detaching.

[0017] As a further description of the above technical solution:

[0018] The front and rear inner walls of the tube are fixedly connected to bearings, and the inner walls of the bearings are rotatably connected to the outside of the rotating shaft.

[0019] As a further description of the above technical solution:

[0020] The reset assembly includes a washer, the rear end of which is fixedly connected to the front end of the ball tube, a torque spring is fixedly connected to the front end of the washer, and the other end of the torque spring is fixedly connected to the rear end of the rotating roller.

[0021] As a further description of the above technical solution:

[0022] A metering injector is mounted at the bottom end of the tube via a flange, and an injection tube is mounted at the other end of the metering injector via a flange.

[0023] The present invention has the following beneficial effects:

[0024] 1. In this invention, by setting up a transfer station storage box and an internal air bladder, the liquid carbon dioxide compressed by the vacuum pump is temporarily stored and buffered, preventing high-pressure fluid from directly acting on the output pipeline and injection components. This design effectively reduces the long-term pressure impact on the pipeline system, reduces problems such as pipeline rupture and seal aging caused by high pressure, significantly extends the service life of various components of the device, and reduces equipment maintenance costs. Compared with the traditional direct injection method, the temporary storage and buffering mechanism can reduce the instantaneous pressure peak of the pipeline by about 40% and extend the seal replacement cycle by more than 2 times, which is especially suitable for high-pressure, high-frequency operation scenarios, greatly improving the economic efficiency of the equipment throughout its entire life cycle.

[0025] 2. In this invention, the pressure generated by the expansion of the air bladder drives a series of mechanical structures, including a sliding rod, telescopic components, and rotating rollers, to automatically open and close the ball valve. This purely mechanical drive control method eliminates the need for complex electronic sensors and control systems, reducing the failure rate of electronic components in high-pressure and low-temperature environments. This effectively improves the stability and reliability of the device under complex oilfield conditions, while simplifying the equipment structure and reducing manufacturing costs and maintenance difficulty. The mechanical transmission system amplifies force through the lever principle, allowing even a slight expansion of the air bladder to trigger valve action. Compared to electronic control systems, this reduces the failure rate by 70%, and it maintains stable operation even in extremely cold environments down to -40°C, making it suitable for harsh field conditions in oilfields. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a quantitative injection device for carbon dioxide flooding proposed in this invention;

[0027] Figure 2 This is a schematic diagram of the vacuum pump structure of a quantitative injection device for carbon dioxide flooding proposed in this invention;

[0028] Figure 3 This is a schematic diagram of the temporary storage box of a quantitative injection device for carbon dioxide flooding proposed in this invention;

[0029] Figure 4 This is a schematic diagram of the structure of the gasbag in a quantitative injection device for carbon dioxide flooding proposed in this invention;

[0030] Figure 5 for Figure 4 Enlarged view of point A in the image;

[0031] Figure 6 This is a schematic diagram of the outer column of a quantitative injection device for carbon dioxide flooding proposed in this invention;

[0032] Figure 7 This is a schematic diagram of the structure of a ball valve in a quantitative injection device for carbon dioxide flooding proposed in this invention;

[0033] Figure 8 This is a schematic diagram of the gasket structure of a quantitative injection device for carbon dioxide flooding proposed in this invention.

[0034] Legend:

[0035] 1. Storage tank; 2. Feed pipe; 3. Extraction pipe; 4. Support; 5. Motor; 6. Vacuum pump; 7. Temporary storage box; 8. Airbag; 9. Output pipe; 10. Chassis; 11. Sliding rod; 12. Pressure spring; 13. Inner column one; 14. Outer column; 15. Inner column two; 16. Limit block; 17. Pull rope; 18. Rotary roller; 19. Anti-detachment ring; 20. Rotating shaft; 21. Ball valve; 22. Bearing; 23. Ball tube; 24. Washer; 25. Torque spring; 26. Metering injector; 27. Injection tube. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Reference Figures 1 to 8 This invention provides an embodiment of a quantitative injection device for carbon dioxide flooding, comprising a storage tank 1 and a support 4. The storage tank 1 stores liquid carbon dioxide to be injected into the oil, providing raw material reserves for subsequent extraction and injection. The support 4 supports and fixes other components of the device, ensuring the overall structural stability. An extraction assembly is installed at the top of the storage tank 1 to extract and compress the liquid carbon dioxide. The extraction assembly includes a feed pipe 2, the bottom end of which is mounted on the top left side of the storage tank 1 via a flange. The feed pipe 2 is made of seamless alloy steel resistant to low temperatures and high pressures, capable of withstanding approximately 25 MPa pressure, and transports the liquid carbon dioxide to the storage tank. Tank 1 ensures safe and stable transportation. An extraction pipe 3 is installed on the top right side of the liquid storage tank 1 via a flange. A motor 5 is fixedly connected to the top of the bracket 4. A vacuum pump 6 is fixedly connected to the drive end of the motor 5. The extraction pipe 3 can connect the liquid storage tank 1 and the vacuum pump 6, transporting the liquid carbon dioxide in the liquid storage tank 1 to the vacuum pump 6 for compression. The motor 5 provides power to the vacuum pump 6, driving it to operate. The vacuum pump 6 is a device used to generate a vacuum environment and compress gas. It has an adjustable pressure function and a maximum output pressure of 30MPa. It can extract and compress the liquid carbon dioxide in the liquid storage tank 1 to the standard pressure and purity that meet the requirements of oil displacement operations.

[0038] The other end of the extraction pipe 3 is installed at the input end of the vacuum pump 6 via a flange. A temporary storage box 7 is fixedly connected to the top of the bracket 4, serving as a transfer station to temporarily store and buffer the liquid carbon dioxide compressed by the vacuum pump 6, preventing high-pressure fluid from directly acting on the output pipe and injection components, and reducing the pressure impact on the pipeline system. The temporary storage box 7 is equipped with an airbag 8, which adopts a three-layer composite structure design. The inner layer is made of fluororubber, with a working temperature range of -40℃ to 200℃ and can withstand a pressure of not less than 35MPa. It has good chemical stability against carbon dioxide and is protected from corrosion. The middle layer is woven from high-strength aramid fiber to improve the overall structural strength. The outer layer is coated with a polytetrafluoroethylene anti-corrosion coating to further enhance the protective performance. Used to temporarily store compressed liquid carbon dioxide, the pressure generated by its own expansion drives the subsequent structural actions. The rear end of the temporary storage box 7 is fixedly connected to an output pipe 9, the other end of which is installed at the output end of the extraction component and fixedly connected to the output end of the vacuum pump 6. It is made of high-strength seamless steel pipe with a wall thickness of not less than 3mm and a pressure resistance of 45MPa. It delivers the liquid carbon dioxide compressed by the vacuum pump 6 to the air bag 8 inside the temporary storage box 7 to prevent the high-pressure liquid carbon dioxide from causing the pipe to rupture. A sliding rod 11 is slidably connected to the inner wall of the top of the air bag 8. The bottom end of the sliding rod 11 is fixedly connected to a chassis 10 that contacts the outside of the air bag 8. The sliding rod 11 can drive the chassis 10 to move up and down under the pressure generated by the expansion of the air bag 8, thereby transmitting power.

[0039] A pressure spring 12 is fitted around the outside of the sliding rod 11. One end of the pressure spring 12 is fixedly connected to one side of the chassis 10, and the other end is fixedly connected to one side of the inner wall of the temporary storage box 7. The pressure spring 12 here is made of alloy spring steel, and its elastic coefficient has been precisely calculated to ensure that it remains within the elastic deformation range when the airbag 8 is subjected to maximum pressure. When in a compressed state, it can generate a downward elastic force on the chassis 10 and the sliding rod 11, which interacts with the inflation pressure of the airbag 8 to control the movement of the sliding rod 11. A telescopic assembly is installed at the top of the temporary storage box 7. The telescopic assembly includes an inner column 13, one end of which is rotatably connected to the top of the sliding rod 11. An outer column 14, which is fixed to the top of the temporary storage box 7, is slidably connected to the outside of the inner column 13. An inner column 2 15 is slidably connected to the other side of the outer column 14. As the sliding rod 11 moves up or down, the lever principle causes the sliding rod 11 to drive the outer column 14 and the inner column 2 15 to move. Furthermore, the torque arm on the side closer to the inner column 13 is much longer than that on the side of the inner column 2 15. Utilizing the lever principle, a small force can be applied to rotate the inner column 2 15. Limiting blocks 16 are fixedly connected to the sides of the outer column 14 and the inner column 2 15 to limit the sliding range of the inner column 2 15 and ensure the stability and accuracy of the telescopic component's movement. A pull rope 17 is installed at one end of the telescopic component, and one end of the pull rope 17 is rotatably connected to the other end of the inner column 2 15. Here, the inner column 2 15 is rotatably connected to one end of the pull rope 17, and the tension of the pull rope 17 is changed when it rotates.

[0040] The other end of the pull rope 17 is fixedly connected to a rotating roller 18. The rotating roller 18 has threaded grooves on its outer surface for winding the pull rope 17. Two anti-detachment rings 19 are fixedly connected to the outside of the rotating roller 18 to prevent the pull rope 17 from accidentally detaching. The anti-detachment rings 19 on both sides can prevent the pull rope 17 from accidentally detaching. A rotating shaft 20 is fixedly connected to the rear end of the rotating roller 18. A ball valve 21 is fixedly connected to the outside of the rotating shaft 20. The rotating shaft 20 can transmit the power of the rotating roller 18 when it rotates to wind the pull rope 17, thereby driving the ball valve 21 to rotate. The ball valve 21 is controlled to open and close, and rotates under the drive of the rotating shaft 20. When the chassis 10 moves to the top, the ball valve 21 rotates exactly 90 degrees, and the opening is fully opened to release the liquid carbon dioxide temporarily stored in the airbag 8. After the injection is completed, it closes to control the flow of liquid carbon dioxide. The ball valve 21 is rotatably connected to the outside of the ball tube 23. The front and rear inner walls of the ball tube 23 are fixedly connected to the bearings 22. The inner wall of the bearings 22 is rotatably connected to the outside of the rotating shaft 20. The bearings 22 here provide rotational support for the rotating shaft 20 and also serve as the flow direction for the liquid carbon dioxide.

[0041] A reset assembly is installed at the front end of the ball tube 23. The reset assembly includes a washer 24, the rear end of which is fixedly connected to the front end of the ball tube 23. A torque spring 25 is fixedly connected to the front end of the washer 24 and fixedly attached to the front end of the ball tube 23, providing mounting support for the torque spring 25. When the tension of the pull rope 17 decreases, it drives the rotating roller 18 to reset, thereby closing the ball valve 21 and storing energy for the next working cycle. It should be noted that the force of the pressure spring 12 here is greater than the force of the torque spring 25 in the reset assembly. The other end of the torque spring 25 is fixedly connected to... At the rear end of the rotary roller 18, the bottom end of the ball tube 23 is equipped with a metering injector 26 via a flange. This is a key piece of equipment in carbon dioxide flooding operations. It can regulate the flow rate and control the pressure of liquid carbon dioxide to ensure that the carbon dioxide injected into the oil meets the requirements of the flooding process. At the same time, it can output liquid carbon dioxide in a metered manner. The other end of the metering injector 26 is equipped with an injection pipe 27 via a flange. The pipe is made of a material with good pressure resistance and corrosion resistance and can withstand a pressure of about 30 MPa. It injects the liquid carbon dioxide processed by the metering injector 26 into the oil.

[0042] Working Principle: Liquid carbon dioxide is conveyed to the storage tank 1 via the feed pipe 2. The feed pipe 2 is made of seamless alloy steel pipe resistant to low temperature and high pressure, capable of withstanding approximately 25MPa pressure to ensure safe conveying. The motor 5 on the start bracket 4 drives the vacuum pump 6. The vacuum pump 6 is a device used to create a vacuum environment and compress gas. The vacuum pump 6 used in this device has an adjustable pressure function, with a maximum output pressure of 30MPa, capable of extracting and compressing the liquid carbon dioxide in the storage tank 1 to the standard pressure and purity required for oil displacement operations. The compressed liquid carbon dioxide is then conveyed to the gas bladder 8 in the temporary storage box 7 via the output pipe 9. The output pipe 9 also uses high-strength seamless steel pipe with a wall thickness of not less than 3mm and a pressure resistance rating of 45MPa to prevent pipe rupture caused by high-pressure liquid carbon dioxide.

[0043] The airbag 8 adopts a three-layer composite structure design. The inner layer is made of fluororubber, which has excellent low-temperature resistance, an operating temperature range of -40℃ to 200℃, and can withstand pressures of no less than 35MPa. It also exhibits good chemical stability against carbon dioxide, preventing corrosion. The middle layer is woven from high-strength aramid fibers, significantly improving the overall structural strength of the airbag 8. The outer layer is coated with a polytetrafluoroethylene anti-corrosion coating, further enhancing its protective performance. When liquid carbon dioxide is injected into the airbag 8, it gradually inflates, increasing internal pressure. This pressure overcomes the elastic force of the pressure spring 12, pushing the chassis 10 and the sliding rod 11 upwards. The pressure spring 12 is made of alloy spring steel, and its elastic coefficient is precisely calculated to ensure that it remains within its elastic deformation range even when the airbag 8 is subjected to maximum pressure.

[0044] As the slide rod 11 moves upward, the telescopic assembly connected to the slide rod 11 begins to operate. The telescopic assembly consists of an inner column 13, an outer column 14, and an inner column 2 15. The bottom end of the outer column 14 is fixed to the top of the temporary storage box 7, and the torque arm near the inner column 13 is much longer than that of the inner column 2 15. According to the lever principle, a small force required to move the slide rod 11 upward can rotate the outer column 14, thereby causing the inner column 2 15 to rotate, and the end of the inner column 2 15 away from the outer column 14 descends. The pull rope 17 is connected to the inner column 2 15. When the inner column 2 15 descends, the tension of the pull rope 17 on the rotating roller 18 decreases. Because the pressure spring 12 is normally in a twisted state, when the tension decreases, the rotating roller 18 will rotate to a certain extent under the action of the torque spring 25. The rotating roller 18 has a threaded groove on its surface for winding the pull rope 17, and the anti-detachment rings 19 on both sides can prevent the pull rope 17 from accidentally detaching. The rotating roller 18 is fixedly connected to the rotating shaft 20, which drives the ball valve 21 to rotate. When the chassis 10 moves to the top, the ball valve 21 rotates exactly 90 degrees, and the opening is fully opened, releasing the liquid carbon dioxide temporarily stored in the airbag 8.

[0045] The released liquid carbon dioxide flows into the metering injector 26 through the pneumatic tube 23. The metering injector 26 is a key piece of equipment in carbon dioxide flooding operations. It can regulate the flow rate and control the pressure of liquid carbon dioxide to ensure that the carbon dioxide injected into the oil meets the requirements of the flooding process, while also outputting liquid carbon dioxide in a metered manner. The treated liquid carbon dioxide is injected into the oil through the injection pipe 27, which also has good pressure resistance and corrosion resistance and can withstand a pressure of about 30 MPa. After the injection is completed, the pressure inside the air bladder 8 decreases, the force of the pressure spring 12 is greater than the force of the torque spring 25 in the reset assembly, the chassis 10 and the slide rod 11 descend, driving the components to move in the opposite direction, the pull rope 17 is released from the rotating roller 18, the ball valve 21 closes, the device returns to its initial state, and the spring enters the storage state, preparing for the next working cycle.

[0046] This design, which temporarily stores liquid carbon dioxide in the airbag 8, effectively buffers the output pressure of the vacuum pump 6 and the pipeline transportation pressure, reduces the damage to equipment and pipelines caused by high pressure, improves the stability and safety of the device, and ensures the efficient operation of carbon dioxide flooding.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A quantitative injection device for carbon dioxide flooding oil, comprising a liquid storage tank (1) and a support (4), characterized in that: The top end of the liquid storage tank (1) is provided with a pumping assembly, the top end of the support (4) is fixedly connected with a temporary storage box (7), the inside of the temporary storage box (7) is provided with an air bag (8), the rear end of the temporary storage box (7) is fixedly connected with an output pipe (9), the other end of the output pipe (9) is installed on the output end of the pumping assembly, the top end inner wall of the air bag (8) is slidably connected with a slide rod (11), the bottom end of the slide rod (11) is fixedly connected with a bottom disc (10) in contact with the outside of the air bag (8), the outside of the slide rod (11) is sleeved with a pressure spring (12), the top end of the temporary storage box (7) is provided with a telescopic assembly, one end of the telescopic assembly is provided with a pull rope (17), the other end of the pull rope (17) is fixedly connected with a rotating roller (18), the rear end of the rotating roller (18) is fixedly connected with a rotating shaft (20), the outside of the rotating shaft (20) is fixedly connected with a ball valve (21), the outside of the ball valve (21) is rotatably connected with a ball pipe (23), the front end of the ball pipe (23) is provided with a reset assembly, the bottom end of the ball pipe (23) is provided with a quantitative injector (26) through a flange, the other end of the quantitative injector (26) is provided with an injection pipe (27) through a flange.

2. The quantitative injection device for carbon dioxide flooding of claim 1, wherein: The pumping assembly comprises a feeding pipe (2), the bottom end of the feeding pipe (2) is installed on the top end left side of the liquid storage tank (1) through a flange, the top end right side of the liquid storage tank (1) is provided with a pumping pipe (3) through a flange, the top end of the support (4) is fixedly connected with a motor (5), the driving end of the motor (5) is fixedly connected with a vacuum pump (6), the other end of the pumping pipe (3) is installed on the input end of the vacuum pump (6) through a flange, the other end of the output pipe (9) is fixedly connected on the output end of the vacuum pump (6).

3. The quantitative injection device for carbon dioxide flooding of claim 1, wherein: One end of the pressure spring (12) is fixedly connected on one side of the bottom disc (10), the other end of the pressure spring (12) is fixedly connected on one side of the inner wall of the temporary storage box (7).

4. The quantitative injection device for carbon dioxide flooding of claim 1, wherein: The telescopic assembly comprises an inner column one (13), one end of the inner column one (13) is rotatably connected on the top end of the slide rod (11), the outside of the inner column one (13) is slidably connected with an outer column (14) fixed on the top end of the temporary storage box (7), the other side of the outer column (14) is slidably connected with an inner column two (15), the side close to the outer column (14) and the inner column two (15) are both fixedly connected with a limiting block (16), one end of the pull rope (17) is rotatably connected on the other end of the inner column two (15).

5. The quantitative injection device for carbon dioxide flooding of claim 1, wherein: The outside of the rotating roller (18) is provided with a threaded groove for winding the pull rope (17), the outside of the rotating roller (18) is fixedly connected with two anti-disengagement rings (19) for preventing the pull rope (17) from being accidentally disengaged.

6. The quantitative injection device for carbon dioxide flooding of claim 1, wherein: The front and rear inner walls of the ball pipe (23) are both fixedly connected with a bearing (22), the inner wall of the bearing (22) is rotatably connected on the outside of the rotating shaft (20).

7. The quantitative injection device for carbon dioxide flooding of claim 1, wherein: The reset assembly comprises a gasket (24), the rear end of the gasket (24) is fixedly connected to the front end of the ball tube (23), the front end of the gasket (24) is fixedly connected with a torque spring (25), the other end of the torque spring (25) is fixedly connected to the rear end of the rotating roller (18).

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