Non-dehydration mixed absorption supercharger for carbon dioxide oil displacement process

Abstract

The invention provides a non-dehydration mixed absorption supercharger for a carbon dioxide oil displacement process, and belongs to the technical field of superchargers. Comprising an oil cylinder barrel, a left oil-gas cylinder connecting end cover, a left air cylinder, a right oil-gas cylinder connecting end cover, a right air cylinder, an oil cylinder piston, a left piston rod, a right piston rod, a left air cylinder end cover, a right air cylinder end cover, a left air cylinder piston and a right air cylinder piston. The left end of the oil cylinder barrel is connected with a left cylinder through a left oil-gas cylinder connecting end cover; the right end of the oil cylinder barrel is connected with a right air cylinder through a right oil gas cylinder connecting end cover, a short plummer block is arranged at the right end of a left piston rod, and the right end of the left piston rod is coaxially connected with the left inner end of an oil cylinder piston. The problems of piston lubrication, decomposition and reduction of supporting constraint points are solved, eccentric wear is reduced, the wear of the piston rod is reduced, the air inlet valve and the air outlet valve are arranged inside, the axial perpendicularity of the valve element and the valve seat is ensured, and the eccentric wear is reduced.

Description

Technical Field

[0001] The invention provides a non-dehydration mixed-absorption booster for a carbon dioxide oil recovery process, belonging to the technical field of boosters. Background Art

[0002] CO2 flooding is a new oil recovery technology that can both reduce greenhouse gas emissions and increase oilfield recovery. However, the current CO2 flooding process is complex, with high investment and operating costs, which seriously affect the economic benefits of the process. High-pressure CO2 is injected from an injection well, driving crude oil and water from the reservoir toward the production well. Due to the high solubility of CO2 at high pressure and its strong ability to penetrate liquids, large amounts of high-pressure CO2 are produced during the oil well production process. Separating the produced oil and then pressurizing the high-pressure CO2 and water at low cost before injecting them into the formation is a key step in the CO2 flooding process.

[0003] The current CO2 reinjection process primarily involves the following steps: depressurizing the oil well output to separate the crude oil, most of the water, and the hydrous CO2. Since the CO2 is very cold after depressurization (approximately -15°C), it must be reheated and filtered through molecular sieves to remove the water. The CO2 is then pressurized by a gas compressor to the required injection pressure. The separated water and CO2 are then re-injected into the injection well. Reducing the number of oil well output processing steps by separating the crude oil under high pressure and then directly re-pressurizing the high-pressure CO2 and water mixture before injecting it into the injection well can significantly reduce equipment investment and operating costs. Currently, gas compressors, vane air pumps, eccentric vane air pumps, and crankshaft high-stroke plunger air pumps all require water removal before compression. Few boosters are suitable for water-CO2 mixtures. For example, screw compressors, due to their lower operating pressures, are not used in CO2 flooding.

[0004] Therefore, in view of this, the existing structure is studied and improved, and a non-dehydration mixed suction booster for carbon dioxide oil recovery process is proposed to solve the above problems. Summary of the Invention

[0005] The present invention proposes a non-dehydration mixed-absorption booster for the carbon dioxide flooding process, which solves the problems of piston lubrication, decomposition and reduction of support constraint points, reduces eccentric wear and piston rod wear, has built-in inlet and exhaust valves, and ensures that the axial direction of the valve core and valve seat is vertical, thereby reducing the eccentric wear problem.

[0006] In order to solve the above problems, the present invention proposes a technical solution: a non-dehydration mixed suction booster for carbon dioxide flooding process, including an oil cylinder barrel, a left oil-gas cylinder connecting end cover, a left cylinder, a right oil-gas cylinder connecting end cover, a right cylinder, an oil cylinder piston, a left piston rod, a right piston rod, a left cylinder end cover, a right cylinder end cover, a left cylinder piston, and a right cylinder piston; the left end of the oil cylinder barrel is connected to the left cylinder through the left oil-gas cylinder connecting end cover; the left end of the oil cylinder barrel is provided with a left oil channel; the left oil-gas cylinder connecting end cover is provided with an air intake channel at the right end of the left cylinder and an exhaust channel at the right end of the left cylinder, and the oil cylinder barrel The left oil channel is connected to the left hydraulic oil pipe joint, and the right end of the cylinder barrel is connected to the right cylinder through the right oil-gas cylinder connecting end cover. The right end of the left piston rod has a short shaft platform, and the right end of the left piston rod is coaxially connected to the left inner end of the cylinder piston, and is positioned by the short shaft platform at the right end of the left piston rod, the inner hole of the cylinder piston and the annular positioning bolt; the left end of the left piston rod is fixed with the left cylinder piston, and the left cylinder piston is slidingly matched with the left cylinder through the left cylinder piston sealing ring group; the inner wall of the right oil-gas cylinder connecting end cover is provided with a right piston rod sealing ring group, and the right piston rod sealing ring group is slidingly matched with the right piston rod.

[0007] Furthermore, a left piston sealing ring group is provided on the outer periphery of the cylinder piston and slides with the cylinder barrel; a left piston rod sealing ring group is provided on the inner wall of the left oil-gas cylinder connection end cover, and the left piston rod sealing ring group slides with the left piston rod.

[0008] Furthermore, the air intake channel at the right end of the left cylinder is provided with an air intake one-way valve, and the exhaust channel at the right end of the left cylinder is provided with an exhaust one-way valve; the left end of the left cylinder is connected to the left cylinder end cover, and the left cylinder end cover is provided with an air intake channel and an exhaust channel at the left end of the left cylinder, and the air intake channel and the exhaust channel at the left end of the left cylinder are provided with an air intake one-way valve and an exhaust one-way valve.

[0009] Furthermore, the left end of the right piston rod has a short shaft platform, which is coaxially connected to the right inner end of the cylinder piston and is positioned by the short shaft platform at the left end of the right piston rod, the inner hole of the cylinder piston and the annular positioning bolt.

[0010] Furthermore, the right end of the oil cylinder barrel is provided with a right oil channel, the right oil-gas cylinder connecting end cover is provided with a right cylinder left intake channel and a right cylinder left exhaust channel, the right oil channel is connected to the hydraulic oil pipe joint, the right cylinder left intake channel is provided with an intake check valve, the right cylinder left exhaust channel is provided with an exhaust check valve, the right end of the right cylinder is connected to the right cylinder end cover, the right cylinder end cover is provided with a right cylinder right intake channel and a right cylinder right exhaust channel, the right cylinder right intake channel of the right cylinder end cover is provided with an intake check valve, and the right cylinder right exhaust channel of the right cylinder end cover is provided with an exhaust check valve.

[0011] Furthermore, a right cylinder piston is fixed to the right end of the right piston rod, and the right cylinder piston is slidingly matched with the right cylinder through the right cylinder piston sealing group; the right end of the left piston rod is provided with an oil hole, and the left cylinder piston is provided with a radial through hole; the left end of the right piston rod is provided with an oil hole, and the right cylinder piston is provided with a radial through hole; the oil hole provided at the left end of the right piston rod, the inner hole of the right piston rod and the radial through hole provided on the right cylinder piston form a right lubricating oil channel.

[0012] Furthermore, the clearance between the short shaft platform at the right end of the left piston rod and the inner hole of the cylinder piston is 0.2-1mm, and the annular positioning bolt limits the axial displacement of the short shaft platform at the right end of the left piston rod in the inner hole of the cylinder piston to be less than 1mm; the clearance between the short shaft platform at the left end of the left piston rod and the inner hole of the cylinder piston is 0.2-1mm, and the annular positioning bolt limits the axial displacement of the short shaft platform at the left end of the left piston rod in the inner hole of the cylinder piston to be less than 1mm; the right end of the left piston rod can have radial displacement relative to the cylinder piston and is not subject to radial constraints of the cylinder piston, and the left end of the right piston rod can have radial displacement relative to the cylinder piston and is not subject to radial constraints of the cylinder piston. The 5-point constraint structure of the supercharger along the axial direction is transformed into 2 3-point constraint structures, and the axial concentricity is easier to ensure.

[0013] Furthermore, the oil hole provided at the right end of the left piston rod, the inner hole of the left piston rod and the radial through hole provided on the left cylinder piston form a left lubricating oil channel. The left lubricating oil channel is provided with an internal bolt group and the right lubricating oil channel is provided with a bolt group. The bolts and bolt holes have a small clearance fit, which limits the amount of lubricating oil passing through and ensures that when the left cylinder piston sealing ring group and the right cylinder piston sealing group fail, there will be no large amount of hydraulic oil leakage.

[0014] Furthermore, the left end of the inner hole wall of the left oil and gas cylinder connecting end cover is equipped with copper bearing 1, and the right end of the inner hole wall is equipped with copper bearing 2. The left end of the inner hole wall of the right oil and gas cylinder connecting end cover is equipped with copper bearing 3, and the right end of the inner hole wall is equipped with copper bearing 4.

[0015] Furthermore, the intake one-way valve and the exhaust one-way valve are placed in the left oil and gas cylinder end cover; the intake one-way valve and the exhaust one-way valve are placed in the right oil and gas cylinder end cover; the intake one-way valve and the exhaust one-way valve are placed in the left cylinder end cover; the intake one-way valve and the exhaust one-way valve are placed in the right cylinder end cover; the axis of the valve core and the valve seat of the intake one-way valve, the exhaust one-way valve, the intake one-way valve, the exhaust one-way valve, the intake one-way valve, the exhaust one-way valve, the intake one-way valve, the exhaust one-way valve, the intake one-way valve, the exhaust one-way valve, are perpendicular to the horizontal plane.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the non-dehydration mixed-absorption booster for carbon dioxide flooding process of the present invention are as follows:

[0017] 1. The present invention provides a left lubricating oil channel and a right lubricating oil channel to introduce hydraulic oil into the middle of the cylinder piston sealing ring group, forming a lubricating oil film on the cylinder wall, effectively solving the problem of the cylinder piston sealing ring being in a "dry grinding" state without oil lubrication, reducing the wear of the sealing ring, and improving the sealing performance and service life of the equipment.

[0018] 2. The present invention transforms the axial five-point constraint structure of the supercharger into two three-point constraint structures, so that the left and right piston rods can have radial displacement relative to the cylinder piston, reducing the excessive wear of a certain constraint point due to the difficulty in ensuring the concentricity of the constraint point processing and installation, reducing the occurrence of eccentric wear, and improving the stability and reliability of equipment operation.

[0019] 3. The present invention installs a copper bearing on the inner hole wall of the oil and gas cylinder connection end cover, utilizing the good wear resistance of the copper bearing to slow down the wear of the steel-based piston rod, extend the service life of the piston rod, and reduce the maintenance cost of the equipment.

[0020] 4. The present invention sets the axis of the valve core and valve seat of the intake check valve and the exhaust check valve to be perpendicular to the horizontal plane, which reduces the eccentric wear of the valve core and valve seat during operation, improves the sealing performance and service life of the valve, and ensures the normal operation and working efficiency of the supercharger.

[0021] 5. The present invention rationally arranges the intake and exhaust check valves in each end cover, which reduces the space occupied by the check valves, reduces the manufacturing and installation costs of the check valves, makes the structure of the supercharger more compact, and reduces the overall cost of the equipment.

[0022] 6. The booster of the present invention is structurally designed to boost the pressure of high-water-content carbon dioxide, eliminating the need for water removal from the carbon dioxide. This simplifies the process of carbon dioxide flooding, reduces the complexity and cost of the process, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 The present invention is a structural schematic diagram of a non-dehydration mixed-absorption booster used in a carbon dioxide flooding process.

[0025] In the picture:

[0026] 1. Cylinder barrel; 2. Left oil and gas cylinder connecting end cover; 3. Right oil and gas cylinder connecting end cover; 4. Left cylinder; 5. Right cylinder; 6. Cylinder piston; 7. Left piston rod; 8. Right piston rod; 9. Left cylinder piston; 10. Right cylinder piston; 11. Left cylinder end cover; 12. Right cylinder end cover; 13. Intake check valve; 14. Exhaust check valve; 15. Intake check valve; 16. Exhaust check valve; 17. Intake check valve; 18. Exhaust check valve; 19. Intake One-way valve; 20. Exhaust one-way valve; 21. Cylinder left piston seal assembly; 22. Left piston rod seal assembly; 23. Right piston rod seal assembly; 24. Left cylinder piston seal assembly; 25. Right cylinder piston seal assembly; 26. Annular locating bolt; 27. Left hydraulic oil pipe joint; 28. Right hydraulic oil pipe joint; 32. Internal bolt assembly; 33. Bolt assembly; 34. Bronze bearing one; 35. Bronze bearing two; 36. Bronze bearing three; 37. Bronze bearing four. DETAILED DESCRIPTION

[0027] 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.

[0028] This application fully explains the problems of the prior art in the technical background, and there are no general or abstract problems. The problems to be solved by this application are described in detail in the following invention content and specific implementation methods, the technical problems to be solved by the technical solution are clarified, and it is determined that the technical solution of this application has beneficial effects relative to the objective prior art.

[0029] See also Figure 1 As shown: The present invention provides a non-dehydration mixed suction booster for carbon dioxide flooding process, comprising an oil cylinder barrel, a left oil-gas cylinder connecting end cover, a left cylinder, a right oil-gas cylinder connecting end cover, a right cylinder, an oil cylinder piston, a left piston rod, a right piston rod, a left cylinder end cover, a right cylinder end cover, a left cylinder piston, and a right cylinder piston;

[0030] The left end of the oil cylinder barrel is connected to the left cylinder through the left oil-gas cylinder connecting end cover; the left end of the oil cylinder barrel is provided with a left oil channel; the left oil-gas cylinder connecting end cover is provided with an intake channel at the right end of the left cylinder and an exhaust channel at the right end of the left cylinder, the left oil channel of the oil cylinder barrel is connected to the left hydraulic oil pipe joint, the intake channel at the right end of the left cylinder is provided with an intake check valve, and the exhaust channel at the right end of the left cylinder is provided with an exhaust check valve; the left end of the left cylinder is connected to the left cylinder end cover, the left cylinder end cover is provided with an intake channel and an exhaust channel at the left end of the left cylinder, and the intake channel and exhaust channel at the left end of the left cylinder are provided with an intake valve and an exhaust valve;

[0031] The right end of the oil cylinder barrel is connected to the right cylinder through the right oil-gas cylinder connecting end cover; the right end of the oil cylinder barrel is provided with a right oil channel; the right oil-gas cylinder connecting end cover is provided with a right cylinder left air intake channel and a right cylinder left exhaust channel, the right oil channel is connected to the hydraulic oil pipe joint, the left air intake channel of the right cylinder is provided with an air intake check valve, and the left exhaust channel of the right cylinder is provided with an exhaust check valve; the right end of the right cylinder is connected to the right cylinder end cover, the right cylinder end cover is provided with a right air intake channel and a right exhaust channel of the right cylinder, the right air intake channel of the right cylinder end cover is provided with an air intake valve, and the right exhaust channel of the right cylinder end cover is provided with an exhaust valve;

[0032] The right end of the left piston rod is provided with a short shaft platform, and the right end of the left piston rod is coaxially connected to the left inner end of the oil cylinder piston, and is positioned by the short shaft platform at the right end of the left piston rod, the left inner hole of the oil cylinder piston and the annular positioning bolt; the left end of the right piston rod is provided with a short shaft platform, and the left end of the right piston rod is coaxially connected to the right inner end of the oil cylinder piston, and is positioned by the short shaft platform at the left end of the right piston rod, the right inner hole of the oil cylinder piston and the annular positioning bolt; the clearance between the short shaft platform at the right end of the left piston rod and the left inner hole of the oil cylinder piston is 0.2-1mm, and the annular positioning bolt limits the axial displacement of the short shaft platform at the right end of the left piston rod in the inner hole of the oil cylinder piston to less than 1mm; the clearance between the short shaft platform at the left end of the right piston rod and the right inner hole of the oil cylinder piston The clearance fit is 0.2-1mm, and the annular locating bolt limits axial displacement of the short bearing at the left end of the right piston rod within the right inner bore of the cylinder piston to less than 1mm. The right end of the left piston rod can move radially relative to the cylinder piston without being radially constrained by the piston. The left end of the right piston rod can move radially relative to the cylinder piston without being radially constrained by the piston. If the cylinder piston and the left and right piston rods were a rigid body, the entire supercharger would be constrained at five points along the axis: the left cylinder and the left piston, the left cylinder connection cover inner bore and the left piston rod, the cylinder and the cylinder piston, the right cylinder connection cover inner bore and the right piston rod, and the right cylinder and the right piston. This five-point constraint is difficult to ensure concentricity during machining and installation, which can increase wear at any of these points and reduce service life. When the left and right piston rods are not rigidly connected to the cylinder piston and are allowed to move radially relative to each other, the original five-point constraint becomes two relatively independent three-point constraints, making it easier to ensure concentricity, reducing wear and extending service life.

[0033] The outer periphery of the oil cylinder piston is provided with an oil cylinder piston sealing ring group, and the oil cylinder piston sealing ring group is slidably matched with the oil cylinder barrel;

[0034] A left piston rod sealing ring group is provided on the inner wall of the left oil-gas cylinder connection end cover, and the left piston rod sealing ring group is in sliding cooperation with the left piston rod; a left cylinder piston is fixed to the left end of the left piston rod, and the left cylinder piston is in sliding cooperation with the left cylinder through the left cylinder piston sealing ring group; a right piston rod sealing ring group is provided on the inner wall of the right oil-gas cylinder connection end cover, and the sealing ring group is in sliding cooperation with the right piston rod; a right cylinder piston is fixed to the right end of the right piston rod, and the right cylinder piston is in sliding cooperation with the right cylinder through the right cylinder piston sealing group;

[0035] The right end of the left piston rod is provided with an oil hole, and the left cylinder piston is provided with a radial through hole; the left end of the right piston rod is provided with an oil hole, and the right cylinder piston is provided with a radial through hole; the oil hole provided at the right end of the left piston rod, the inner hole of the left piston rod and the radial through hole provided with the left cylinder piston form a left lubricating oil channel, which can introduce hydraulic oil into the middle of the left cylinder piston sealing ring group, so that a lubricating oil film is formed on the wall of the left cylinder; the oil hole provided at the left end of the right piston rod, the inner hole of the right piston rod and the radial through hole provided with the right cylinder piston form a right lubricating oil channel, which can introduce hydraulic oil into the middle of the right cylinder piston sealing ring group, so that a lubricating oil film is formed on the wall of the right cylinder;

[0036] The left lubricating oil channel is provided with an internal bolt group, and the right lubricating oil channel is provided with an internal bolt group. The male and female threads thereof have a small clearance fit, which serves to limit the amount of lubricating oil passing through and ensure that when the cylinder piston sealing ring group fails, there will be no large amount of hydraulic oil leakage;

[0037] The left end of the inner hole wall of the left oil and gas cylinder connection end cover is equipped with a copper bearing, and the right end of the inner hole wall is equipped with a copper bearing; the left end of the inner hole wall of the right oil and gas cylinder connection end cover is equipped with a copper bearing, and the right end of the inner hole wall is equipped with a copper bearing. For steel-based piston rods, copper bearings have good wear resistance and can extend the service life of the piston rod;

[0038] The intake one-way valve and the exhaust one-way valve are placed in the left oil and gas cylinder end cover; the intake one-way valve and the exhaust one-way valve are placed in the right oil and gas cylinder end cover; the intake one-way valve and the exhaust one-way valve are placed in the left cylinder end cover; the intake one-way valve and the exhaust one-way valve are placed in the right cylinder end cover; this makes all the intake one-way valves and the exhaust one-way valves occupy less space and reduces the manufacturing and installation costs of the one-way valves.

[0039] The axes of the valve cores and valve seats of the intake and exhaust one-way valves are perpendicular to the horizontal plane, thereby reducing eccentric wear of the valve cores and valve seats.

[0040] The specific connection relationship is as follows: the left end of the oil cylinder barrel 1 is connected to the left cylinder 4 through the left oil and gas cylinder connecting end cover 2, the left end of the oil cylinder barrel 1 is provided with a left oil channel, the left oil and gas cylinder connecting end cover 2 is provided with an intake channel and an exhaust channel at the right end of the left cylinder 4, the left oil channel of the oil cylinder barrel 1 is connected to the left hydraulic oil pipe joint 30, the intake channel at the right end of the left cylinder 4 is provided with an intake check valve 15, and the exhaust channel is provided with an exhaust check valve 16; the left end of the left cylinder 4 is connected to the left cylinder end cover 11, the left cylinder end cover 11 is provided with an intake channel and an exhaust channel at the left end of the left cylinder 4, and an intake valve 13 and an exhaust valve 14 are provided on these two channels respectively.

[0041] The right end of the oil cylinder barrel 1 is connected to the right cylinder 5 through the right oil-gas cylinder connecting end cover 3. The right end of the oil cylinder barrel 1 is provided with a right oil channel. The right oil-gas cylinder connecting end cover 3 is provided with a right cylinder left air intake channel and a right cylinder left exhaust channel. The right oil channel is connected to the hydraulic oil pipe joint 31. The left air intake channel of the right cylinder is provided with an air intake check valve 17, and the left exhaust channel of the right cylinder is provided with an exhaust check valve 18; the right end of the right cylinder 5 is connected to the right cylinder end cover 12. The right cylinder end cover 12 is provided with a right air intake channel and a right exhaust channel of the right cylinder 5. The right air intake channel of the right cylinder of the right cylinder end cover 12 is provided with an air intake valve 19, and the right exhaust channel of the right cylinder of the right cylinder end cover 12 is provided with an exhaust valve 20.

[0042] The left piston rod 7 has a short shaft boss at its right end, and its right end is coaxially connected to the left inner end of the cylinder piston 6, and is positioned by the short shaft boss at the right end of the left piston rod 7, the inner hole of the cylinder piston 6, and the annular positioning bolt 26. The right piston rod 8 has a short shaft boss at its left end, and its left end is coaxially connected to the right inner end of the cylinder piston 6, and is positioned by the short shaft boss at the left end of the right piston rod 8, the inner hole of the cylinder piston 6, and the annular positioning bolt 27. The short shaft boss at the right end of the left piston rod 7 and the inner hole of the cylinder piston 6 adopt a clearance fit, with a clearance of 0.2-1mm. The annular positioning bolt 26 limits the axial displacement of the short shaft boss at the right end of the left piston rod 7 in the inner hole of the cylinder piston 6 to less than 1mm. The short shaft boss at the left end of the right piston rod 8 and the inner hole of the cylinder piston 6 also adopt a clearance fit, with a clearance of 0.2-1mm. The annular positioning bolt 27 limits the axial displacement of the short shaft boss at the left end of the right piston rod 8 in the inner hole of the cylinder piston 6 to less than 1mm. This design allows the right end of the left piston rod 7 to be radially displaced relative to the cylinder piston 6 without being radially constrained by the cylinder piston 6. The left end of the right piston rod 8 can be radially displaced relative to the cylinder piston 6 without being radially constrained by the cylinder piston 6. The 5-point constraint structure of the supercharger in the axial direction is transformed into 2 3-point constraint structures, which makes it easier to ensure axial concentricity.

[0043] The outer periphery of the oil cylinder piston 6 is provided with an oil cylinder left piston sealing ring group 21 that slides with the oil cylinder barrel 1; the inner wall of the left oil and gas cylinder connecting end cover 2 is provided with a left piston rod sealing ring group 22 that slides with the left piston rod 7, and the left end of the left piston rod 7 is fixed with a left cylinder piston 9, and the left cylinder piston 9 slides with the left cylinder 4 through the left cylinder piston sealing ring group 24; the inner wall of the right oil and gas cylinder connecting end cover 3 is provided with a right piston rod sealing ring group 23 that slides with the right piston rod 8, and the right end of the right piston rod 8 is fixed with a right cylinder piston 10, and the right cylinder piston 10 slides with the right cylinder 5 through the right cylinder piston sealing group 25.

[0044] The right end of the left piston rod 7 is provided with an oil hole, and the left cylinder piston 9 is provided with a radial through hole. The left end of the right piston rod 8 is provided with an oil hole, and the right cylinder piston 10 is provided with a radial through hole. The oil hole at the right end of the left piston rod 7, the inner hole of the left piston rod 7, and the radial through holes of the left cylinder piston 9 form a left lubricating oil passage, which can introduce hydraulic oil into the center of the left cylinder piston seal ring group and form a lubricating oil film on the left cylinder wall. The oil hole at the left end of the right piston rod 8, the inner hole of the right piston rod 8, and the radial through holes of the right cylinder piston 10 form a right lubricating oil passage, which can introduce hydraulic oil into the center of the right cylinder piston seal ring group and form a lubricating oil film on the right cylinder wall.

[0045] An internal bolt group 32 is provided in the left lubricating oil channel, and a bolt group 33 is provided in the right lubricating oil channel. The bolts and the bolt holes have a small clearance fit to limit the amount of lubricating oil passing through and ensure that when the cylinder piston sealing ring group 24 and the cylinder piston sealing ring group 25 fail, a large amount of hydraulic oil leakage will not occur.

[0046] The left end of the inner hole of the left oil and gas cylinder connection end cap 2 is equipped with a copper bearing 34, and the right end is equipped with a copper bearing 35. The left end of the inner hole of the right oil and gas cylinder connection end cap 3 is equipped with a copper bearing 36, and the right end is equipped with a copper bearing 37. Copper bearings have excellent wear resistance for steel-based piston rods, which can effectively extend the service life of the piston rods.

[0047] The intake check valve 13 and the exhaust check valve 14 are placed in the left oil and gas cylinder end cover; the intake check valve 15 and the exhaust check valve 16 are placed in the right oil and gas cylinder end cover; the intake check valve 17 and the exhaust check valve 18 are placed in the left cylinder end cover; the intake check valve 19 and the exhaust check valve 20 are placed in the right cylinder end cover. This design makes all the intake check valves and exhaust check valves occupy less space, reducing the manufacturing and installation costs of the check valves.

[0048] The axes of the valve cores and valve seats of the intake check valve 13, the exhaust check valve 14, the intake check valve 15, the exhaust check valve 16, the intake check valve 17, the exhaust check valve 18, the intake check valve 19 and the exhaust check valve 20 are perpendicular to the horizontal plane, thereby reducing eccentric wear of the valve cores and valve seats.

[0049] The present invention and its embodiments are described above. Such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A non-dehydration mixed suction booster for carbon dioxide flooding process, characterized in that: The invention comprises an oil cylinder barrel (1), a left oil-gas cylinder connecting end cover (2), a left cylinder (4), a right oil-gas cylinder connecting end cover (3), a right cylinder (5), an oil cylinder piston (6), a left piston rod (7), a right piston rod (8), a left cylinder end cover (11), a right cylinder end cover (12), a left cylinder piston (9), and a right cylinder piston (10); the left end of the oil cylinder barrel (1) is connected to the left cylinder (4) through the left oil-gas cylinder connecting end cover (2); the left end of the oil cylinder barrel (1) is provided with a left oil channel; the left oil-gas cylinder connecting end cover (2) is provided with an air intake channel at the right end of the left cylinder (4) and an exhaust channel at the right end of the left cylinder (4); the left oil channel of the oil cylinder barrel (1) is connected to a left hydraulic oil pipe joint (30); the oil cylinder The right end of the cylinder (1) is connected to the right cylinder (5) through the right oil-gas cylinder connecting end cover (3); the right end of the left piston rod (7) has a short shaft platform, and the right end of the left piston rod (7) is coaxially connected to the left inner end of the oil cylinder piston (6), and is positioned by the short shaft platform at the right end of the left piston rod (7), the inner hole of the oil cylinder piston (6) and the annular positioning bolt (26); the left end of the left piston rod (7) is fixed with a left cylinder piston (9), and the left cylinder piston (9) is slidably matched with the left cylinder (4) through the left cylinder piston sealing ring group (24); the inner wall of the right oil-gas cylinder connecting end cover (3) is provided with a right piston rod sealing ring group (23), and the right piston rod sealing ring group (23) is slidably matched with the right piston rod (8).

2. A non-dehydration mixed suction booster for a carbon dioxide flooding process according to claim 1, characterized in that: The outer periphery of the oil cylinder piston (6) is provided with an oil cylinder left piston sealing ring group (21) which is in sliding cooperation with the oil cylinder barrel (1); the inner wall of the left oil and gas cylinder connecting end cover (2) is provided with a left piston rod sealing ring group (22), and the left piston rod sealing ring group (22) is in sliding cooperation with the left piston rod (7).

3. A non-dehydration mixed suction booster for a carbon dioxide flooding process according to claim 2, characterized in that: The right end of the left cylinder (4) has an intake check valve (15) at its intake passage, and the right end of the left cylinder has an exhaust check valve (16) at its exhaust passage. The left end of the left cylinder (4) is connected to the left cylinder end cover (11), and the left cylinder end cover (11) has an intake passage and an exhaust passage at the left end of the left cylinder (4). The intake passage and the exhaust passage at the left end of the left cylinder (4) are provided with an intake check valve (13) and an exhaust check valve (14).

4. A non-dehydration mixed-absorption booster for a carbon dioxide flooding process according to claim 3, characterized in that: The left end of the right piston rod (8) is provided with a short shaft platform, and the left end of the right piston rod (8) is coaxially connected to the right inner end of the oil cylinder piston (6), and is positioned by the short shaft platform at the left end of the right piston rod (8), the inner hole of the oil cylinder piston (6) and the annular positioning bolt (26).

5. The non-dehydration mixed-absorption booster for carbon dioxide flooding process according to claim 4, characterized in that: The right end of the oil cylinder barrel (1) is provided with a right oil channel, the right oil-gas cylinder connecting end cover (3) is provided with a right cylinder left air intake channel and a right cylinder left exhaust channel, the right oil channel is connected to a hydraulic oil pipe joint (31), the right cylinder left air intake channel is provided with an air intake check valve (17), the right cylinder left exhaust channel is provided with an exhaust check valve (18), the right end of the right cylinder (5) is connected to the right cylinder end cover (12), the right cylinder end cover (12) is provided with a right cylinder (5) right air intake channel and a right cylinder (5) right exhaust channel, the right cylinder right air intake channel of the right cylinder end cover (12) is provided with an air intake check valve (19), and the right cylinder right exhaust channel of the right cylinder end cover (12) is provided with an exhaust check valve (20).

6. A non-dehydration mixed-absorption booster for a carbon dioxide flooding process according to claim 5, characterized in that: The right end of the right piston rod (8) is fixed with a right cylinder piston (10), and the right cylinder piston (10) is slidably matched with the right cylinder (5) through the right cylinder piston sealing group (25); the right end of the left piston rod (7) is provided with an oil hole, and the left cylinder piston (9) is provided with a radial through hole; the left end of the right piston rod (8) is provided with an oil hole, and the right cylinder piston (10) is provided with a radial through hole; the oil hole provided at the left end of the right piston rod (8), the inner hole of the right piston rod (8) and the radial through hole provided on the right cylinder piston (10) form a right lubricating oil channel.

7. The non-dehydration mixed-absorption booster for carbon dioxide flooding process according to claim 6, characterized in that: The clearance fit between the short shaft platform at the right end of the left piston rod (7) and the inner hole of the oil cylinder piston (6) is 0.2-1mm, and the annular positioning bolt (26) limits the axial displacement of the short shaft platform at the right end of the left piston rod (7) in the inner hole of the oil cylinder piston (6) to be less than 1mm; the clearance fit between the short shaft platform at the left end of the left piston rod (7) and the inner hole of the oil cylinder piston (6) is 0.2-1mm, and the annular positioning bolt (26) limits the axial displacement of the short shaft platform at the left end of the left piston rod (7) in the inner hole of the oil cylinder piston (6) to be less than 1mm; the right end of the left piston rod (7) can have radial displacement relative to the oil cylinder piston (6) and is not subject to radial constraints of the oil cylinder piston (6); the left end of the right piston rod (8) can have radial displacement relative to the oil cylinder piston (6) and is not subject to radial constraints of the oil cylinder piston (6); the 5-point constraint structure of the supercharger along the axial direction is transformed into 2 3-point constraint structures, and the axial concentricity is easier to ensure.

8. The non-dehydration mixed-absorption booster for carbon dioxide flooding process according to claim 2, characterized in that: The oil hole provided at the right end of the left piston rod (7), the inner hole of the left piston rod (7) and the radial through hole provided in the left cylinder piston (9) form a left lubricating oil channel. An internal bolt group (32) is provided in the left lubricating oil channel and a bolt group (33) is provided in the right lubricating oil channel. The bolts and bolt holes have a small clearance fit to limit the amount of lubricating oil passing through and ensure that when the left cylinder piston sealing ring group (24) and the right cylinder piston sealing group (25) fail, a large amount of hydraulic oil leakage will not occur.

9. The non-dehydration mixed-absorption booster for carbon dioxide flooding process according to claim 1, characterized in that: The left end of the inner hole wall of the left oil and gas cylinder connecting end cover (2) is equipped with a copper bearing 1 (34), and the right end of the inner hole wall thereof is equipped with a copper bearing 2 (35). The left end of the inner hole wall of the right oil and gas cylinder connecting end cover (3) is equipped with a copper bearing 3 (36), and the right end of the inner hole wall thereof is equipped with a copper bearing 4 (37).

10. The non-dehydration mixed-absorption booster for carbon dioxide flooding process according to claim 5, characterized in that: The intake check valve (13) and the exhaust check valve (14) are placed in the left oil and gas cylinder end cover; the intake check valve (15) and the exhaust check valve (16) are placed in the right oil and gas cylinder end cover; the intake check valve (17) and the exhaust check valve (18) are placed in the left cylinder end cover; the intake check valve (19) and the exhaust check valve (20) are placed in the right cylinder end cover; the axes of the valve cores and valve seats of the intake check valve (13), the exhaust check valve (14), the intake check valve (15), the exhaust check valve (16), the intake check valve (17), the exhaust check valve (18), the intake check valve (19) and the exhaust check valve (20) are perpendicular to the horizontal plane.

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