Natural gas double-cylinder supercharger for high water content and small amount of fine sand

Abstract

The invention provides a natural gas double-cylinder supercharger for high water content and a small amount of fine sand, 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 left air cylinder end cover, a right oil-gas cylinder connecting end cover, a right air cylinder, a right air cylinder end cover, an oil cylinder piston, a left piston rod, a right piston rod, 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 left oil-gas cylinder connecting end cover is provided with an air inlet channel at the right end of the left cylinder and an exhaust channel at the right end of the left cylinder; the air inlet channel at the right end of the left cylinder is provided with an air inlet one-way valve I; according to the invention, long stroke and large cylinder diameter can be realized from the structural design, which is equivalent to the displacement of two cylinders with the same diameter, so that large displacement is realized, the requirement of a slave well platform on the displacement is met, support constraint points are decomposed and reduced, the abrasion of a piston rod and a cylinder piston is reduced, and the reasonable mounting mode of the exhaust valve is beneficial to sand discharge; and the eccentric wear problem of the valve core and the valve seat is reduced.

Description

Technical Field

[0001] The invention provides a natural gas double-cylinder supercharger for high water content and a small amount of fine sand, belonging to the technical field of superchargers. Background Art

[0002] In the middle and late stages of natural gas cluster well production (platform wells), the formation pressure decays, the gas production decreases, the water carrying capacity decreases, and the water accumulation in the wellbore continues to increase. As the wellhead pressure gradually decreases, the pressure difference with the gas pipeline decreases, and the back pressure of the gas pipeline and other factors have a greater impact on the gas well production.

[0003] One of the current technological measures to address the aforementioned issues and increase and stabilize production is to use surface compressors to reduce wellhead pressure and then boost the pressure to meet the required delivery pressure. This suction action increases the pressure differential from the bottom of the well to the wellhead, improving the natural gas flow rate and liquid-carrying capacity of the wellbore, and boosting the pressure to reach the delivery pressure, thereby increasing and stabilizing production or slowing the rate of decline in gas wells. Currently, there are many types of compressors, such as vane air pumps, eccentric vane air pumps, and piston-connecting rod natural gas compressors. All require three-phase separation of the fluid discharged from the gas well, removing liquid and fine sand before suction and boosting the pressure. This increases equipment investment and operating costs. In cold climates, the phase separator is prone to freezing and malfunctioning in winter, affecting the normal operation of the equipment. Some types of compressors also have smaller exhaust volumes and are not suitable for the higher displacement requirements of platform gas wells.

[0004] Therefore, in view of this, the existing structure was studied and improved, and a natural gas twin-cylinder booster for high water content and a small amount of fine sand was proposed to solve the above problems. Summary of the Invention

[0005] The present invention proposes a natural gas dual-cylinder booster for high water content and a small amount of fine sand. From the perspective of structural design, it can achieve a long stroke and a large cylinder diameter, which is equivalent to the exhaust volume of two cylinders of the same diameter, thereby achieving a large displacement, adapting to the exhaust volume requirements of slave-type well platforms, decomposing and reducing support constraint points, reducing piston rod and cylinder piston wear, and the reasonable installation method of the exhaust valve is conducive to sand discharge, and reduces the problem of eccentric wear of the valve core and valve seat.

[0006] In order to solve the above problems, the present invention proposes a technical solution: a natural gas dual-cylinder booster for high water content and a small amount of fine sand, comprising a cylinder barrel, a left oil-gas cylinder connecting end cover, a left cylinder, a left cylinder end cover, a right oil-gas cylinder connecting end cover, a right cylinder, a right cylinder end cover, a cylinder piston, a left piston rod, a right piston rod, a left cylinder piston, and a right cylinder piston; the left end of the cylinder barrel is connected to the left cylinder through the left oil-gas cylinder connecting end cover; the left end of the 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; the left oil channel of the cylinder barrel is connected to the left hydraulic oil pipe joint, and the air intake channel at the right end of the left cylinder is provided with an air intake check valve 1, the The exhaust channel at the right end of the left cylinder is provided with an exhaust one-way valve 1; 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 intake channel and an exhaust channel at the left end of the left cylinder, and the intake channel and the exhaust channel at the left end of the left cylinder are respectively provided with an intake one-way valve 3 and an exhaust one-way valve 3; 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 left intake channel of the right cylinder and a left exhaust channel of the right cylinder, and the right oil channel is connected to the hydraulic oil pipe joint, and the left cylinder piston is assembled on the reducing shaft at the left end of the left piston rod through a bolt limiting short shaft 1, and a left cylinder sealing ring group is provided on the outer periphery of the left cylinder piston.

[0007] Furthermore, the left air intake channel of the right cylinder is provided with an air intake check valve 2, and the left exhaust channel of the right cylinder is provided with an exhaust check valve 2; the right end of the right cylinder is connected to the right cylinder end cover, and the right cylinder end cover is provided with a right air intake channel of the right cylinder 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 check valve 4, and the right exhaust channel of the right cylinder end cover is provided with an exhaust check valve 4.

[0008] Furthermore, the left piston rod and the right piston rod are coaxially docked and fixed with the cylinder piston to form a whole; the outer periphery of the cylinder piston is provided with a cylinder barrel sealing ring group, and the cylinder barrel sealing ring group slides with the cylinder barrel; the inner wall of the left oil-gas cylinder connecting end cover is provided with a left piston rod sealing ring group, and the left piston rod sealing ring group slides with the left piston rod.

[0009] Furthermore, a right piston rod sealing ring group is provided on the inner wall of the right oil-gas cylinder connection end cover, and the right piston rod sealing ring group is in sliding cooperation with the right piston rod.

[0010] Furthermore, the left cylinder sealing ring group is in sliding cooperation with the left cylinder; the right cylinder piston is assembled on the reducing shaft at the right end of the right piston rod through a bolt limiting short shaft 2, and a right cylinder sealing ring group is provided on the outer periphery of the right cylinder piston, and the right cylinder sealing ring group is in sliding cooperation with the right cylinder.

[0011] Furthermore, the right end of the inner bore of the left cylinder piston has a clearance fit with the reduced diameter shaft at the left end of the left piston rod, with the clearance between the shaft and the bore exceeding 0.2 mm. The left cylinder piston also has an axial clearance fit with the bolt stop short shaft, with the axial clearance exceeding 0.2 mm. This provides the left cylinder piston with limited radial freedom, freeing it from radial constraints on the left piston rod, and helps alleviate eccentric wear on the left piston rod and left cylinder piston in the case of long-stroke and large-diameter cylinder pistons.

[0012] Furthermore, the left end of the inner bore of the right cylinder piston has a clearance fit with the reduced diameter shaft at the right end of the right piston rod, with the shaft-hole clearance greater than 0.2 mm. The right cylinder piston also has an axial clearance fit with the second bolt-limiting short shaft, with the axial clearance greater than 0.2 mm. This provides the right cylinder piston with limited radial freedom, relieving the radial constraint of the right cylinder piston on the right piston rod.

[0013] Furthermore, the left and right ends of the left cylinder piston are respectively equipped with a group of two supporting sand-proof rings, and the openings of the two supporting sand-proof rings are staggered by 10°-180°; the left and right ends of the right cylinder piston are respectively equipped with a group of two supporting sand-proof rings, and the openings of the two supporting sand-proof rings are staggered by 10°-180°.

[0014] Furthermore, the axes of the valve cores and valve seats of the intake one-way valve, exhaust one-way valve, intake one-way valve, exhaust one-way valve, intake one-way valve, exhaust one-way valve, intake one-way valve, and exhaust one-way valve are perpendicular to the horizontal plane.

[0015] Furthermore, the left and right exhaust channels of the left cylinder are located at the lower part of the left cylinder, and the left and right exhaust channels of the right cylinder are located at the lower part of the right cylinder, that is, exhaust one-way valve one and exhaust one-way valve three are installed at the lower end of the left cylinder, and exhaust one-way valve two and exhaust one-way valve four are installed at the lower end of the right cylinder.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the natural gas dual-cylinder booster for high water content and small amount of fine sand of the present invention are as follows:

[0017] 1. The present invention effectively improves the sealing performance of the supercharger by providing multiple sealing ring groups, such as the cylinder seal ring group, the left piston rod seal ring group, the right piston rod seal ring group, the left cylinder seal ring group and the right cylinder seal ring group, thereby preventing natural gas leakage and the entry of moisture and fine sand into key components, and ensuring the stable operation of the supercharger under conditions of high water content and a small amount of fine sand.

[0018] 2. The left and right cylinder pistons and piston rods of the present invention adopt special clearance fit and axial clearance fit, which gives the cylinder pistons limited radial freedom and relieves the radial constraint on the piston rod. Under the working conditions of long stroke and large diameter cylinder pistons, the problem of eccentric wear of the piston rod and cylinder piston is significantly reduced, the service life of the components is extended, and the maintenance cost is reduced.

[0019] 3. The supporting sand-proof rings provided on the left and right cylinder pistons of the present invention have openings staggered at a certain angle, which can effectively prevent fine sand from entering the fitting gap between the piston and the cylinder, further protecting the components, reducing wear and tear, and improving the reliability of the supercharger.

[0020] 4. The axis of the valve core and valve seat of the one-way valve of the present invention is perpendicular to the horizontal plane, and the exhaust channel is arranged at the lower part of the cylinder. This design makes it difficult for moisture and fine sand to accumulate in the one-way valve under conditions of high water content and a small amount of fine sand, avoiding blockage and failure of the one-way valve, ensuring the normal intake and exhaust of natural gas, and improving the working efficiency and stability of the supercharger. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 This is a structural schematic diagram of a natural gas dual-cylinder booster for high water content and a small amount of fine sand according to the present invention.

[0023] In the picture:

[0024] 1. Cylinder barrel; 2. Left oil and gas cylinder connection cover; 3. Left cylinder; 4. Left cylinder end cover; 5. Right oil and gas cylinder connection cover; 6. Right cylinder; 7. Right cylinder end cover; 8. Cylinder piston; 9. Left piston rod; 10. Right piston rod; 11. Left cylinder piston; 12. Right cylinder piston; 13. Cylinder barrel seal ring assembly; 14. Left piston rod seal ring assembly; 15. Right piston rod seal ring assembly; 16. Left cylinder seal ring assembly Sealing ring group; 17. Right cylinder sealing ring group; 18. Left hydraulic oil pipe joint; 19. Hydraulic oil pipe joint; 20. Intake check valve one; 21. Exhaust check valve one; 22. Intake check valve three; 23. Exhaust check valve three; 24. Intake check valve two; 25. Exhaust check valve two; 26. Intake check valve four; 27. Exhaust check valve four; 28. Bolt limit short shaft one; 29. ​​Bolt limit short shaft two. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] See also Figure 1 As shown: The present invention provides a natural gas dual-cylinder booster for high water content and a small amount of fine sand, comprising a 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;

[0028] 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 check valve three and an exhaust check valve three;

[0029] 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 2, and the left exhaust channel of the right cylinder is provided with an exhaust check valve 2; 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 check valve 4, and the right exhaust channel of the right cylinder end cover is provided with an exhaust check valve 4;

[0030] The left piston rod and the right piston rod are coaxially connected and fixed to the oil cylinder piston to form an integral body. After integral processing, it is easy to ensure the concentricity of the left and right piston rods and the oil cylinder piston for the long stroke, and reduce the wear of the left and right piston rods and the oil cylinder piston during reciprocating motion;

[0031] The outer periphery of the oil cylinder piston is provided with an oil cylinder barrel sealing ring group, and the oil cylinder barrel sealing ring group is slidably matched with the oil cylinder barrel;

[0032] The inner wall of the left oil and gas cylinder connection end cover is provided with a left piston rod sealing ring group, and the left piston rod sealing ring group slides with the left piston rod; the left end of the left piston rod is installed with a left cylinder piston, and the outer periphery of the left cylinder piston is provided with a left cylinder sealing ring group, and the sealing ring group of the left cylinder slides with the left cylinder; the inner wall of the right oil and gas cylinder connection end cover is provided with a right piston rod sealing ring group, and the sealing ring group slides with the right piston rod; the right cylinder piston is assembled on the reduced diameter shaft at the right end of the right piston rod through a bolt limiting short shaft, and the outer periphery of the right cylinder piston is provided with a right cylinder sealing ring group, and the right cylinder piston sealing group slides with the right cylinder;

[0033] The right end of the inner bore of the left cylinder piston has a clearance fit with the reduced diameter shaft at the left end of the left piston rod, with the shaft-hole fit clearance greater than 0.2mm. The left cylinder piston has an axial clearance fit with the bolt limiting short shaft, with the axial clearance greater than 0.2mm. This ensures that the left cylinder piston has limited radial freedom, relieves the radial constraint of the left cylinder piston on the left piston rod, and helps to reduce the problem of eccentric wear between the left piston rod and the left cylinder piston in the case of long stroke and large diameter cylinder pistons.

[0034] The left end of the inner bore of the right cylinder piston has a clearance fit with the reduced diameter shaft at the right end of the right piston rod, with the shaft-hole clearance greater than 0.2 mm. The right cylinder piston also has an axial clearance fit with the bolt limiting short shaft, with the axial clearance greater than 0.2 mm. This ensures that the right cylinder piston has limited radial freedom and relieves the radial constraint of the right cylinder piston on the right piston rod, which helps to reduce the problem of uneven wear of the piston rod and the right cylinder piston in the case of long stroke and large diameter cylinder pistons.

[0035] The left and right ends of the left cylinder piston are each equipped with a set (two) of supporting and anti-sand rings. The openings of the two supporting and anti-sand rings are staggered by 10°-180°, which not only strengthens the supporting effect but also prevents fine sand from contacting the sealing ring, thus preventing the sealing ring from shortening its service life and increasing wear of the cylinder barrel; the left and right ends of the right cylinder piston are each equipped with a set (two) of supporting and anti-sand rings. The openings of the two supporting and anti-sand rings are staggered by 10°-180°, which not only strengthens the supporting effect but also prevents fine sand from contacting the sealing ring, thus preventing the sealing ring from shortening its service life and increasing wear of the cylinder barrel;

[0036] The axis of the valve core and valve seat of all intake and exhaust check valves should be perpendicular to the horizontal plane to reduce eccentric wear of the valve core and valve seat.

[0037] The left exhaust channel of the left cylinder is located at the lower part of the left cylinder, and the exhaust one-way valve is installed at the lowest end of the left cylinder. The right exhaust channel of the left cylinder is located at the lower part of the left cylinder, and the exhaust one-way valve is installed at the lowest end of the left cylinder; the left exhaust channel of the right cylinder is located at the lower part of the right cylinder, and the exhaust one-way valve is installed at the lowest end of the right cylinder. The right exhaust channel of the right cylinder is located at the lower part of the right cylinder, and the exhaust one-way valve is installed at the lowest end of the right cylinder, so that the vortex turbulent airflow during exhaust can more easily discharge fine sand from the cylinder barrel.

[0038] The specific structural connection is as follows: 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 1, and the exhaust channel at the right end of the left cylinder is provided with an exhaust check valve 1; 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 the exhaust channel at the left end of the left cylinder are respectively provided with an intake check valve 3 and an exhaust check valve 3.

[0039] 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, and the right oil channel is connected to the hydraulic oil pipe joint.

[0040] In terms of the connection and sealing between the piston and the piston rod, the left piston rod and the right piston rod are coaxially docked and fixed with the cylinder piston to form a whole; the outer periphery of the cylinder piston is provided with a cylinder barrel sealing ring group, and the cylinder barrel sealing ring group slides with the cylinder barrel; the inner wall of the left oil-gas cylinder connection end cover is provided with a left piston rod sealing ring group, and the left piston rod sealing ring group slides with the left piston rod; the inner wall of the right oil-gas cylinder connection end cover is provided with a right piston rod sealing ring group, and the right piston rod sealing ring group slides with the right piston rod.

[0041] The left cylinder piston is assembled on the reduced diameter shaft at the left end of the left piston rod by means of a bolt-limited short shaft 1, and a left cylinder sealing ring group is provided on the outer periphery of the left cylinder piston, and the left cylinder sealing ring group slides with the left cylinder; the right cylinder piston is assembled on the reduced diameter shaft at the right end of the right piston rod by means of a bolt-limited short shaft 2, and a right cylinder sealing ring group is provided on the outer periphery of the right cylinder piston, and the right cylinder sealing ring group slides with the right cylinder.

[0042] In order to solve the problem of eccentric wear of the piston and the piston rod, the right end of the inner hole of the left cylinder piston is clearance-matched with the reduced diameter shaft at the left end of the left piston rod, and the axial hole clearance is greater than 0.2mm. The left cylinder piston and the bolt limiting short shaft have an axial clearance fit, and the axial clearance is greater than 0.2mm, so that the left cylinder piston has limited radial freedom, and the radial constraint of the left cylinder piston on the left piston rod is released; similarly, the left end of the inner hole of the right cylinder piston is clearance-matched with the reduced diameter shaft at the right end of the right piston rod, and the axial hole clearance is greater than 0.2mm. The right cylinder piston and the bolt limiting short shaft have an axial clearance fit, and the axial clearance is greater than 0.2mm, so that the right cylinder piston has limited radial freedom, and the radial constraint of the right cylinder piston on the right piston rod is released.

[0043] In order to prevent fine sand from entering and affecting the operation of components, the left and right ends of the left cylinder piston are respectively equipped with a group of supporting sand-proof rings, and the openings of the two supporting sand-proof rings are staggered by 10°-180°; the left and right ends of the right cylinder piston are respectively equipped with a group of supporting sand-proof rings, and the openings of the two supporting sand-proof rings are staggered by 10°-180°.

[0044] In terms of the one-way valve setting, the axes of the valve cores and valve seats of the intake one-way valve one, exhaust one-way valve one, intake one-way valve three, exhaust one-way valve three, intake one-way valve two, exhaust one-way valve two, intake one-way valve four, and exhaust one-way valve four are perpendicular to the horizontal plane; the left and right exhaust channels of the left cylinder are located at the lower part of the left cylinder, and the left and right exhaust channels of the right cylinder are located at the lower part of the right cylinder, that is, exhaust one-way valve one and exhaust one-way valve three are installed at the lower end of the left cylinder, and exhaust one-way valve two and exhaust one-way valve four are installed at the lower end of the right cylinder.

[0045] The present invention and its embodiments are described above. This 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 this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A natural gas twin-cylinder booster for high water content and small amount of fine sand, characterized by: The invention comprises an oil cylinder barrel (1), a left oil-gas cylinder connecting end cover (2), a left cylinder (3), a left cylinder end cover (4), a right oil-gas cylinder connecting end cover (5), a right cylinder (6), a right cylinder end cover (7), an oil cylinder piston (8), a left piston rod (9), a right piston rod (10), a left cylinder piston (11), and a right cylinder piston (12); the left end of the oil cylinder barrel (1) is connected to the left cylinder (3) 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 (3) and an exhaust channel at the right end of the left cylinder (3); the left oil channel of the oil cylinder barrel (1) is connected to a left hydraulic oil pipe joint (18); the air intake channel at the right end of the left cylinder (3) is provided with an air intake one-way valve (20), and the exhaust channel at the right end of the left cylinder is provided with an exhaust one-way valve (21). (21); the left end of the left cylinder (3) is connected to the left cylinder end cover (4), and the left cylinder end cover (4) is provided with an intake channel and an exhaust channel at the left end of the left cylinder (3), and the intake channel and the exhaust channel at the left end of the left cylinder (3) are respectively provided with an intake check valve three (22) and an exhaust check valve three (23); the right end of the oil cylinder barrel (1) is connected to the right cylinder (6) through the right oil and gas cylinder connecting end cover (5); the right end of the oil cylinder barrel (1) is provided with a right oil channel; the right oil and gas cylinder connecting end cover (5) is provided with a right cylinder left intake channel and a right cylinder left exhaust channel, and the right oil channel is connected to the hydraulic oil pipe joint (19), and the left cylinder piston (11) is assembled on the reduced diameter shaft at the left end of the left piston rod (9) through a bolt limiting short shaft one (28), and a left cylinder sealing ring group (16) is provided on the outer periphery of the left cylinder piston (11).

2. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 1, characterized in that: The left air intake channel of the right cylinder is provided with an air intake check valve No. 2 (24), and the left air exhaust channel of the right cylinder is provided with an air exhaust check valve No. 2 (25); the right end of the right cylinder (6) is connected to the right cylinder end cover (7), and the right cylinder end cover (7) is provided with a right air intake channel of the right cylinder (6) and a right air exhaust channel of the right cylinder (6), the right air intake channel of the right cylinder end cover (7) is provided with an air intake check valve No. 4 (26), and the right exhaust channel of the right cylinder end cover (7) is provided with an exhaust check valve No. 4 (27).

3. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 2, characterized in that: The left piston rod (9) and the right piston rod (10) are coaxially docked and fixed with the oil cylinder piston (8) to form a whole; the outer periphery of the oil cylinder piston (8) is provided with an oil cylinder barrel sealing ring group (13), and the oil cylinder barrel sealing ring group (13) is slidably matched 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 (14), and the left piston rod sealing ring group (14) is slidably matched with the left piston rod (9).

4. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 3, characterized in that: The inner wall of the right oil-gas cylinder connecting end cover (5) is provided with a right piston rod sealing ring group (15), and the right piston rod sealing ring group (15) is slidably matched with the right piston rod (10).

5. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 4, characterized in that: The left cylinder sealing ring group (16) is in sliding cooperation with the left cylinder (3); the right cylinder piston (12) is assembled on the reduced diameter shaft at the right end of the right piston rod (10) through a bolt limiting short shaft 2 (29); the right cylinder sealing ring group (17) is provided on the outer periphery of the right cylinder piston (12), and the right cylinder sealing ring group (17) is in sliding cooperation with the right cylinder (6).

6. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 5, characterized in that: The right end of the inner hole of the left cylinder piston (11) is clearance-matched with the reduced diameter shaft of the left end of the left piston rod (9), and the clearance between the shaft hole and the left cylinder piston (11) is greater than 0.2 mm. The left cylinder piston (11) and the bolt limiting short shaft (28) have an axial clearance fit, and the axial clearance is greater than 0.2 mm. This allows the left cylinder piston (11) to have a limited radial degree of freedom, and relieves the radial constraint of the left cylinder piston (11) on the left piston rod (9), which is beneficial to reducing the problem of eccentric wear of the left piston rod (9) and the left cylinder piston (11) in the case of long stroke and large diameter cylinder pistons.

7. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 6, characterized in that: The left end of the inner hole of the right cylinder piston (12) is clearance-matched with the reduced diameter shaft at the right end of the right piston rod (10), and the shaft-hole clearance is greater than 0.2 mm. The right cylinder piston (12) and the second bolt limiting short shaft (29) have an axial clearance fit, and the axial clearance is greater than 0.2 mm. This allows the right cylinder piston (12) to have a limited radial degree of freedom, thereby relieving the radial constraint of the right cylinder piston (12) on the right piston rod (10).

8. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 6, characterized in that: The left and right ends of the left cylinder piston (11) are respectively equipped with a group (two) of supporting sand-proof rings, and the openings of the two supporting sand-proof rings are staggered by 10°-180°; the left and right ends of the right cylinder piston (12) are respectively equipped with a group (two) of supporting sand-proof rings, and the openings of the two supporting sand-proof rings are staggered by 10°-180°.

9. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 6, characterized in that: The axes of the valve cores and valve seats of the intake one-way valve (20), the exhaust one-way valve (21), the intake one-way valve (22), the exhaust one-way valve (23), the intake one-way valve (24), the exhaust one-way valve (25), the intake one-way valve (26), and the exhaust one-way valve (27) are perpendicular to the horizontal plane.

10. The natural gas dual-cylinder supercharger for high water content and small amount of fine sand according to claim 9, characterized in that: The left and right exhaust passages of the left cylinder (3) are located at the lower part of the left cylinder (3), and the left and right exhaust passages of the right cylinder (6) are located at the lower part of the right cylinder (6), that is, the exhaust check valve 1 (21) and the exhaust check valve 3 (23) are installed at the lower end of the left cylinder (3), and the exhaust check valve 2 (25) and the exhaust check valve 4 (27) are installed at the lower end of the right cylinder (6).

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