Quantitative injection device for carbon dioxide flooding

Abstract

The invention relates to the technical field of deep sea oil drilling equipment manufacturing, and discloses a quantitative injection device for carbon dioxide flooding, 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, and the temporary storage box is internally 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 inner wall of the top end of the air bag is slidably connected with a sliding rod, the bottom end of the sliding rod is fixedly connected with a base plate making contact with the outside of the air bag, and the sliding rod is sleeved with a pressure spring. A telescopic assembly is installed at the top end of the temporary storage box, and a pull rope is installed at one end of the telescopic assembly. According to the invention, through the temporary storage box and the air bag, liquid carbon dioxide compressed by the vacuum pump is temporarily stored and buffered, high-pressure impact on an output pipeline and an injection part is avoided, the problems of fracture and aging are reduced, the service life of equipment is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of deep-sea oil drilling equipment manufacturing, in particular to a quantitative injection device for carbon dioxide oil recovery. Background Art

[0002] In the global energy landscape, oil remains irreplaceable as the lifeblood of industry, and its stable supply directly impacts national energy security and economic lifelines. As onshore oil and gas resources near saturation, deepwater regions, with their reserves exceeding 100 billion barrels of oil equivalent, have become a new battleground in global energy competition. Advanced drilling technologies have successfully produced large quantities of high-quality crude oil in producing areas such as the Gulf of Mexico, Brazil's pre-salt oil fields, and the West African deepwater basin, demonstrating the enormous potential of deepwater oil development. However, the deepwater environment presents a natural barrier. At an average depth of over 2,000 meters, equipment must withstand pressures exceeding 200 atmospheres and temperatures reaching below 4°C. This, coupled with the synergistic corrosion from media such as seawater and hydrogen sulfide, places a triple challenge on the material properties, structural strength, and sealing technology of drilling equipment. In particular, the low temperatures of the deepwater can cause ordinary metals to become brittle, significantly reducing the elasticity and aging resistance of seals. Highly corrosive media can accelerate the wear of key equipment components, making deepwater oil extraction extremely challenging and costly.

[0003] At the same time, traditional oilfield extraction technologies, after long-term operation, generally reach recovery rates of 30%-40%. Against this backdrop, carbon dioxide oil recovery (CO2-EOR) has emerged as a rising star, achieving two goals at once. First, supercritical CO2 injected into the reservoir reduces crude oil viscosity by over 90%, transforming heavy oil into "liquid gold." Furthermore, by expanding the crude oil volume and displacing residual oil, CO2-EOR boosts oil recovery to over 60%. For example, a pilot project in the US Permian Basin has demonstrated significant economic benefits, with CO2-EOR increasing single-well oil production by an average of 50%. Furthermore, every ton of increased crude oil production sequesters 0.5-1.2 tons of CO2, making it a key technology path for the energy industry to achieve its "dual carbon" goals. This technology not only helps oil and gas companies achieve carbon reduction targets but also generates additional revenue through carbon trading, achieving a win-win situation for both energy development and environmental protection.

[0004] However, in the existing technology, in the injection link of carbon dioxide flooding operations, most of the methods used are direct extraction and continuous injection, which lack an effective pressure buffering mechanism. Traditional devices usually directly connect the liquid tank to the vacuum pump, and then transport the compressed liquid carbon dioxide directly to the injection end through a pipeline. The high-pressure fluid flows at high speed in the pipeline, continuously impacting the inner wall of the pipeline, which can easily lead to local stress concentration in the pipeline, 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 at the injection end will also become unstable, which not only affects the oil recovery effect, but also accelerates the wear and aging of the seals, leading to safety hazards such as seal failure and fluid leakage. In addition, the direct injection method causes the various components of the equipment to be in a high-pressure load state for a long time, shortening the overall service life, increasing the frequency of equipment maintenance and replacement, and significantly increasing operating costs and downtime, making it difficult to meet the needs of long-term stable operations in oil fields.

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

[0006] In order to make up for the above shortcomings, the present invention provides a quantitative injection device for carbon dioxide oil recovery, which aims to improve the problems in the existing technology that carbon dioxide oil recovery injection devices mostly adopt direct extraction and continuous injection methods, lack pressure buffering, easily cause pipeline rupture and seal aging, and the equipment has high pressure resistance, short life, high maintenance cost, and is difficult to meet the needs of stable oil field operations.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The top end of the tube connecting the discharging opening of the pump with the help of the crank case is connected with the up-down knob of the control cabinet, and the upper end of the tube connecting the discharging opening of the pump cabinet is connected with the up-down knob of the control cabinet. As a further description of the above technical solution: The extraction assembly includes a feed pipe, the bottom end of the feed pipe is mounted on the left side of the top of the liquid storage tank through a flange, an extraction pipe is mounted on the right side of the top of the liquid storage tank through a flange, the top of the bracket is fixedly connected to a motor, the driving end of the motor is fixedly connected to a vacuum pump, the other end of the extraction pipe is mounted on the input end of the vacuum pump through a flange, and the other end of the output pipe is fixedly connected to the output end of the vacuum pump; As a further description of the above technical solution: 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; As a further description of the above technical solution: The telescopic assembly includes an inner column 1, one end of which is rotatably connected to the top of the sliding rod, the outer side of the inner column 1 is slidably connected to an outer column fixed to the top of the temporary storage box, the other side of the outer column is slidably connected to the inner column 2, the adjacent sides of the outer column and the inner column 2 are fixedly connected to a limit block, and one end of the pull rope is rotatably connected to the other end of the inner column 2; As a further description of the above technical solution: The outside of the roller is provided with a threaded groove for winding the draw rope, and the outside of the roller is fixedly connected to two anti-slip rings to prevent the draw rope from accidentally falling off; As a further description of the above technical solution: The front and rear inner walls of the ball tube are both fixedly connected to bearings, and the inner walls of the bearings are rotatably connected to the outside of the rotating shaft; As a further description of the above technical solution: The reset assembly includes a washer, the rear end of which is fixedly connected to the front end of the ball tube, the front end of which is fixedly connected to a torque spring, and the other end of which is fixedly connected to the rear end of the roller; As a further description of the above technical solution: A quantitative injector is installed at the bottom end of the bulb through a flange, and an injection pipe is installed at the other end of the quantitative injector through a flange.

[0008] The present invention has the following beneficial effects: 1. In the present invention, by setting up a transfer station temporary storage box and an internal air bag, the liquid carbon dioxide compressed by the vacuum pump is temporarily stored and buffered, preventing the high-pressure fluid from directly acting on the output pipe and injection components. This design effectively reduces the long-term pressure shock that the pipeline system is subjected to, 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 buffer mechanism can reduce the instantaneous pressure peak of the pipeline by about 40%, and extend the seal replacement cycle by more than 2 times. It is especially suitable for high-pressure and high-frequency operation scenarios, and greatly improves the economic efficiency of the equipment throughout its life cycle.

[0009] 2. In the present invention, the pressure generated by the expansion of the airbag is used to drive a series of mechanical structures such as the slide rod, telescopic components, and rollers to realize the automatic opening and closing of the ball valve. This purely mechanical drive control method does not rely on complex electronic sensors and control systems, reduces the failure rate of electronic components in high-pressure and low-temperature environments, and effectively improves the stability and reliability of the device under complex operating conditions in the oil field. At the same time, it simplifies the equipment structure, reduces manufacturing costs and maintenance difficulties. The mechanical transmission system achieves force amplification through the principle of leverage, so that a slight expansion of the airbag can trigger the valve action. Compared with the electronic control system, the failure rate is reduced by 70%, and it can still maintain stable operation in an extremely cold environment of -40°C, adapting to the harsh outdoor working conditions of the oil field. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a three-dimensional schematic diagram of a quantitative injection device for carbon dioxide oil recovery proposed by the present invention; Figure 2 This is a schematic structural diagram of a vacuum pump for a quantitative injection device for carbon dioxide oil recovery proposed by the present invention; Figure 3 This is a schematic structural diagram of a temporary storage box of a quantitative injection device for carbon dioxide oil recovery proposed by the present invention; Figure 4 This is a schematic diagram of the structure of an air bag of a quantitative injection device for carbon dioxide oil recovery proposed by the present invention; Figure 5 for Figure 4 A magnified view of point A in the figure; Figure 6 This is a schematic structural diagram of the outer column of a quantitative injection device for carbon dioxide oil recovery proposed by the present invention; Figure 7 This is a schematic structural diagram of a ball valve of a quantitative injection device for carbon dioxide oil recovery proposed by the present invention; Figure 8 This is a structural schematic diagram of a gasket of a quantitative injection device for carbon dioxide oil recovery proposed by the present invention.

[0011] Legend: 1. Liquid storage tank; 2. Feed pipe; 3. Extraction pipe; 4. Bracket; 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. Roller; 19. Anti-slip ring; 20. Rotating shaft; 21. Ball valve; 22. Bearing; 23. Ball tube; 24. Washer; 25. Torque spring; 26. Dosing injector; 27. Injection pipe. DETAILED DESCRIPTION

[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] Reference Figures 1 to 8 , an embodiment provided by the present invention: a quantitative injection device for carbon dioxide flooding, comprising a liquid storage tank 1 and a bracket 4, wherein the liquid storage tank 1 is used to store liquid carbon dioxide to be injected into petroleum, providing a raw material reserve for subsequent extraction and injection, while the bracket 4 plays the role of supporting and fixing other components of the device to ensure the stability of the entire device structure, an extraction component is installed on the top of the liquid storage tank 1 to realize the function of extracting and compressing liquid carbon dioxide from the liquid storage tank 1, the extraction component includes a feed pipe 2, the bottom end of the feed pipe 2 is installed on the left side of the top of the liquid storage tank 1 through a flange, and adopts a low-temperature and high-pressure resistant seamless alloy steel pipe that can withstand a pressure of about 25MPa to transport liquid carbon dioxide to the liquid storage tank Tank 1 ensures a safe and stable transportation process. An extraction pipe 3 is installed on the right side of the top of the liquid storage tank 1 through a flange. The top of the bracket 4 is fixedly connected to a motor 5, and the driving end of the motor 5 is fixedly connected to a vacuum pump 6. The above-mentioned extraction pipe 3 can connect the liquid storage tank 1 and the vacuum pump 6 to transport the liquid carbon dioxide in the liquid storage tank 1 to the vacuum pump 6 for compression processing, and the motor 5 provides a power source for the vacuum pump 6 to drive the vacuum pump 6 to operate. The vacuum pump 6 here is a device for generating a vacuum environment and compressing the 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 a standard pressure and purity that meet the oil recovery operation.

[0014] The other end of the extraction tube 3 is installed on the input end of the vacuum pump 6 through a flange. The top of the bracket 4 is fixedly connected to a temporary storage box 7, which serves as a transfer station to temporarily store and buffer the liquid carbon dioxide compressed by the vacuum pump 6 to prevent the high-pressure fluid from directly acting on the output pipe and injection components, thereby reducing the pressure shock borne by the pipeline system. An airbag 8 is installed inside the temporary storage box 7, which adopts a three-layer composite structure design. The inner layer is made of fluororubber, with an operating temperature range of -40℃-200℃, can withstand a pressure of not less than 35MPa, has good chemical stability to carbon dioxide, and avoids 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. It is used to temporarily store compressed liquid carbon dioxide, and generates pressure through its own expansion to drive subsequent structural actions. The rear end of the temporary storage box 7 is fixedly connected to an output pipe 9, and the other end of the output pipe 9 is installed at the output end of the extraction component. The other end of the output pipe 9 is fixedly connected to the output end of the vacuum pump 6. It adopts high-strength seamless steel pipe with a wall thickness of not less than 3mm and a pressure resistance grade of 45MPa. The liquid carbon dioxide compressed by the vacuum pump 6 is transported to the airbag 8 in the temporary storage box 7 to prevent the high-pressure liquid carbon dioxide from causing the pipeline to rupture. The top inner wall of the airbag 8 is slidably connected to a slide rod 11, and the bottom end of the slide rod 11 is fixedly connected to a chassis 10 in contact with the outside of the airbag 8. The above-mentioned slide rod 11 can drive the chassis 10 to move up and down under the pressure generated by the expansion of the airbag 8, thereby transmitting power.

[0015] The outer sleeve of the slide rod 11 is provided with a pressure spring 12, one end of the pressure spring 12 is fixedly connected to one side of the chassis 10, and the other end of the pressure spring 12 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 is accurately calculated to ensure that it is still within the elastic deformation range when the airbag 8 is subjected to the maximum pressure. When in a compressed state, it can generate a downward elastic force on the chassis 10 and the slide rod 11, which interacts with the expansion pressure of the airbag 8 to control the movement of the slide rod 11. A telescopic component is installed on the top of the temporary storage box 7. The telescopic component includes an inner column 13, one end of the inner column 13 is rotatably connected to the top of the slide rod 11, the outer side of the inner column 13 is slidably connected to an outer column 14 fixed to the top of the temporary storage box 7, and the other side of the outer column 14 is slidably connected to an inner column 2 15. As the slide rod 11 moves up or down, the slide rod 11 can drive the outer column 14 and the inner column 2 15 to move under the action of the lever principle. The moment arm on the side close to inner column one 13 is much longer than that on the side of inner column two 15. By utilizing the principle of leverage, a smaller force can be used to drive the rotation of the inner column two 15, thereby rotating the outer column 14 and the adjacent side of the inner column two 15. The limit block 16 is fixedly connected to limit the sliding range of the inner column two 15, thereby ensuring the stability and accuracy of the telescopic assembly. A pull rope 17 is installed at one end of the telescopic assembly, and one end of the pull rope 17 is rotatably connected to the other end of the inner column two 15. Here, the inner column two 15 is rotatably connected to one end of the pull rope 17, and the tension of the pull rope 17 is changed during rotation.

[0016] The other end of the pull rope 17 is fixedly connected to a roller 18, and a threaded groove is provided on the outside of the roller 18 for winding the pull rope 17. The threaded groove provided on the outside is used to wind the pull rope 17. The outside of the roller 18 is fixedly connected to two anti-slip rings 19 to prevent the pull rope 17 from accidentally detaching. The anti-slip rings 19 on both sides can prevent the pull rope 17 from accidentally detaching. The rear end of the roller 18 is fixedly connected to a rotating shaft 20, and the outside of the rotating shaft 20 is fixedly connected to a ball valve 21. The rotating shaft 20 here can transmit the power of the roller 18 when it rotates when winding the pull rope 17, driving the ball valve 21 to rotate. The ball valve 21 is controlled to open and close, and rotates driven by 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; it is closed after the injection is completed to control the on and off of the liquid carbon dioxide. The outside of the ball valve 21 is rotatably connected to the ball tube 23, and the front and rear inner walls of the ball tube 23 are fixedly connected to the bearing 22. The inner wall of the bearing 22 is rotatably connected to the outside of the rotating shaft 20. The bearing 22 here provides rotation support for the rotating shaft 20 and serves as the flow direction of the liquid carbon dioxide.

[0017] A reset assembly is installed at the front end of the ball tube 23, and the reset assembly includes 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 to the torque spring 25, which is fixed to the front end of the ball tube 23 to provide installation support for the torque spring 25. When the tension of the pull rope 17 decreases, the roller 18 is driven to reset, thereby closing the ball valve 21 and storing force 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 roller 18, a quantitative injector 26 is installed at the bottom end of the bulb 23 through a flange. This is a key equipment in carbon dioxide oil recovery operations. It can perform flow regulation and pressure control on liquid carbon dioxide to ensure that the carbon dioxide injected into the oil meets the requirements of the oil recovery process. At the same time, it can quantitatively output the liquid carbon dioxide. The other end of the quantitative injector 26 is installed with an injection pipe 27 through a flange. It uses materials with good pressure resistance and corrosion resistance and can withstand a pressure of about 30 MPa. The liquid carbon dioxide processed by the quantitative injector 26 is injected into the oil.

[0018] Working principle: Liquid carbon dioxide is transported to the liquid storage tank 1 through the feed pipe 2. The feed pipe 2 adopts a seamless alloy steel pipe that is resistant to low temperature and high pressure and can withstand a pressure of about 25MPa to ensure safe transportation. Start the motor 5 on the bracket 4 to drive the vacuum pump 6 to operate. The vacuum pump 6 is a device used to create a vacuum environment and compress the gas. The vacuum pump 6 used in this device 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 a standard pressure and purity that meets the oil recovery operation. The compressed liquid carbon dioxide is transported to the air bag 8 in the temporary storage box 7 through the output pipe 9. The output pipe 9 also adopts a high-strength seamless steel pipe with a wall thickness of not less than 3mm and a pressure rating of 45MPa to prevent high-pressure liquid carbon dioxide from causing pipeline rupture.

[0019] Airbag 8 utilizes a three-layer composite structure. The inner layer is made of fluororubber, a material with excellent low-temperature resistance, operating in a temperature range of -40°C to 200°C, and capable of withstanding pressures of at least 35 MPa. It also exhibits excellent chemical stability against carbon dioxide, preventing corrosion. The middle layer is woven from high-strength aramid fibers, significantly enhancing the overall structural strength of airbag 8. The outer layer is coated with a polytetrafluoroethylene corrosion-resistant coating, further enhancing its protective properties. When liquid carbon dioxide is injected into airbag 8, it gradually expands, increasing internal pressure, overcoming the elastic force of pressure spring 12 and pushing chassis 10 and slide rod 11 upward. Pressure spring 12 is constructed of alloy spring steel, with a precisely calculated elastic coefficient to ensure that even when the airbag 8 is subjected to maximum pressure, it remains within its elastic deformation range.

[0020] As the slide 11 moves upward, the telescopic assembly connected to the slide 11 begins to operate. The telescopic assembly consists of inner column 13, outer column 14, and 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 moment arm near inner column 13 is much longer than that on the side of inner column 2 15. According to the principle of leverage, the small force applied by the upward movement of the slide 11 can drive the outer column 14 to rotate, thereby rotating the inner column 2 15, 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 roller 18 decreases. Because the pressure spring 12 is normally twisted, when the tension decreases, the roller 18 will rotate to a certain extent under the action of the torque spring 25. The surface of the roller 18 is provided with a threaded groove for winding the pull rope 17, and the anti-slip rings 19 on both sides prevent the pull rope 17 from accidentally detaching. The roller 18 is fixedly connected to the shaft 20, and the shaft 20 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 air bag 8.

[0021] The released liquid carbon dioxide flows into the quantitative injector 26 through the ball tube 23. The quantitative injector 26 is a key equipment in the carbon dioxide oil recovery operation. It can perform flow regulation, pressure control and other treatments on the liquid carbon dioxide to ensure that the carbon dioxide injected into the oil meets the oil recovery process requirements, and at the same time, quantitatively output the liquid carbon dioxide. The treated liquid carbon dioxide is injected into the oil through the injection pipe 27. The injection pipe 27 also has good pressure resistance and corrosion resistance and can withstand a pressure of about 30MPa. After the injection is completed, the pressure in the airbag 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 various components to move in the opposite direction, the pull rope 17 is loosened from the roller 18, the ball valve 21 is closed, the device returns to its initial state, and the spring 2 enters the storage state to prepare for the next working cycle.

[0022] This design of temporarily storing liquid carbon dioxide in the air bag 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 implementation of the carbon dioxide oil recovery operation.

[0023] Finally, it should be noted that the above 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quantitative injection device for carbon dioxide flooding, comprising a liquid storage tank (1) and a bracket (4), characterized in that: The top of the liquid storage tank (1) is equipped with an extraction assembly, the top of the bracket (4) is fixedly connected to a temporary storage box (7), an air bag (8) is installed inside the temporary storage box (7), the rear end of the temporary storage box (7) is fixedly connected to an output tube (9), the other end of the output tube (9) is installed at the output end of the extraction assembly, the top inner wall of the air bag (8) is slidably connected to a sliding rod (11), the bottom end of the sliding rod (11) is fixedly connected to a chassis (10) in contact with the outside of the air bag (8), and the sliding rod (11) is fixedly connected to the bottom of the chassis (10) in contact with the outside of the air bag (8). The rod (11) is provided with a pressure spring (12) on its outer sleeve, a telescopic assembly is installed on the top of the temporary storage box (7), a pull rope (17) is installed on one end of the telescopic assembly, the other end of the pull rope (17) is fixedly connected to a roller (18), the rear end of the roller (18) is fixedly connected to a rotating shaft (20), the outside of the rotating shaft (20) is fixedly connected to a ball valve (21), the outside of the ball valve (21) is rotatably connected to a ball tube (23), and the front end of the ball tube (23) is installed with a reset assembly.

2. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The extraction assembly includes a feed pipe (2), the bottom end of the feed pipe (2) is mounted on the left side of the top end of the liquid storage tank (1) through a flange, an extraction pipe (3) is mounted on the right side of the top end of the liquid storage tank (1) through a flange, the top end of the bracket (4) is fixedly connected to a motor (5), the driving end of the motor (5) is fixedly connected to a vacuum pump (6), the other end of the extraction pipe (3) is mounted on the input end of the vacuum pump (6) through a flange, and the other end of the output pipe (9) is fixedly connected to the output end of the vacuum pump (6).

3. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: One end of the pressure spring (12) is fixedly connected to one side of the chassis (10), and the other end of the pressure spring (12) is fixedly connected to one side of the inner wall of the temporary storage box (7).

4. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The telescopic assembly includes an inner column (13), one end of which is rotatably connected to the top end of the slide rod (11), the outside of the inner column (13) is slidably connected to an outer column (14) fixed to the top end of the temporary storage box (7), the other side of the outer column (14) is slidably connected to the inner column (15), the adjacent sides of the outer column (14) and the inner column (15) are fixedly connected to a limit block (16), and one end of the pull rope (17) is rotatably connected to the other end of the inner column (15).

5. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The outside of the rotating roller (18) is provided with a threaded groove for winding the draw rope (17), and the outside of the rotating roller (18) is fixedly connected with two anti-slip rings (19) for preventing the draw rope (17) from accidentally falling off.

6. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The front and rear inner walls of the ball tube (23) are both fixedly connected to bearings (22), and the inner wall of the bearing (22) is rotatably connected to the outside of the rotating shaft (20).

7. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The reset assembly comprises a washer (24), the rear end of the washer (24) being fixedly connected to the front end of the ball tube (23), the front end of the washer (24) being fixedly connected to a torque spring (25), and the other end of the torque spring (25) being fixedly connected to the rear end of the roller (18).

8. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: A quantitative injector (26) is mounted on the bottom end of the bulb (23) via a flange, and an injection pipe (27) is mounted on the other end of the quantitative injector (26) via a flange.

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