Hydraulic cylinder lifting system for oil and gas rig substructure

Abstract

The hydraulic cylinder lifting system for the oil and gas drilling rig base is disclosed, which realizes synchronous lifting and lowering of the first hydraulic cylinder and the second hydraulic cylinder of the drilling rig base through the first reversing control valve combined with the synchronous valve, the one-way throttle valve, the ninth balance valve, the tenth balance valve and the like, realizes independent control of the base lifting cylinder through the second reversing control valve and the third reversing control valve cooperating with the first balance valve, the second balance valve, the third balance valve, the fourth balance valve, the first hydraulic control one-way valve, the second hydraulic control one-way valve and the like, and realizes double safety guarantee and emergency lowering of the drilling rig base lifting and the like through the fifth balance valve, the sixth balance valve, the seventh balance valve, the eighth balance valve, the first throttle valve, the second throttle valve, the fourth one-way valve, the fifth one-way valve, the first hydraulic control reversing valve, the second hydraulic control reversing valve and the like, thereby solving the problems of heavy load hovering, lowering and pipeline explosion prevention, stall glide and the like in the lifting and lowering of the drilling rig base.

Description

Technical Field

[0001] This invention belongs to the field of petroleum drilling and production machinery technology, and relates to a hydraulic cylinder lifting system for the base of an oil and gas drilling rig. Background Technology

[0002] As heavy-duty equipment, oil and gas drilling rigs typically have a base lifting / lowering weight exceeding 100 tons, and for deep and ultra-deep well drilling rigs, this can even reach over 400 tons. Therefore, ensuring the safe and stable lifting and lowering of the rig base is crucial. Traditionally, the drilling rig base is lifted and lowered using the main drilling winch. However, this requires the mechanical, electrical, and hydraulic systems of the drilling rig to be fully installed and tested before lifting and lowering the base, which slows down the rig's relocation cycle. Therefore, the use of hydraulic cylinders for lifting the rig base has gradually become popular. However, existing hydraulic cylinder lifting methods suffer from problems such as hovering, slippage, pipeline explosion-proof issues, and stalling under heavy loads. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic cylinder lifting system for the base of an oil and gas drilling rig, which solves the problems of hovering, slippage, pipeline explosion prevention, and stalling during hydraulic cylinder lifting under heavy load conditions in existing drilling rigs.

[0004] The technical solution adopted in this invention is a hydraulic cylinder lifting system for the base of an oil and gas drilling rig, including an oil supply port and an oil return port. The oil supply port is connected to a first check valve, a second check valve, and a third check valve through pipeline A.

[0005] The first check valve is followed by the first directional control valve, the one-way throttle valve, the ninth balance valve, and the synchronization valve. The synchronization valve is followed by the first hydraulically controlled check valve and the second hydraulically controlled check valve. The first hydraulically controlled check valve is followed by the seventh balance valve, the first throttle valve, the first hydraulically controlled directional valve, and the rodless chamber port of the first hydraulic cylinder. The second hydraulically controlled check valve is followed by the eighth balance valve, the second throttle valve, the second hydraulically controlled directional valve, and the rodless chamber port of the second hydraulic cylinder.

[0006] The first directional control valve is also connected to the tenth balance valve. The tenth balance valve is connected to the rod chamber port of the first hydraulic cylinder through the fifth balance valve. The tenth balance valve is connected to the rod chamber port of the second hydraulic cylinder through the sixth balance valve. The first directional control valve is also connected to the return port.

[0007] The second check valve is followed by the second reversing control valve and the fourth balance valve. The fourth balance valve is connected between the first hydraulic check valve and the seventh balance valve through pipeline B.

[0008] The second directional control valve is also connected to the second balance valve. The second balance valve is connected between the tenth balance valve and the sixth balance valve through pipeline C. The second directional control valve is also connected to the return port.

[0009] The third check valve is connected in sequence to the third directional control valve and the third balance valve. The third balance valve is connected between the second hydraulic check valve and the eighth balance valve through pipeline D.

[0010] The third directional control valve is also connected to the first balance valve, which is connected to the pipeline C via pipeline E. The third directional control valve is also connected to the return port.

[0011] The invention is further characterized in that,

[0012] It also includes a one-way relief valve, which is connected to the oil supply port and the oil outlet port respectively.

[0013] A fourth pressure gauge is installed at the oil supply port.

[0014] A first pressure gauge is installed on pipeline B, a second pressure gauge is installed on pipeline D, and a third pressure gauge is installed on pipeline C.

[0015] The first throttle valve is connected in parallel with a fourth check valve, the outlet of which is located between the first hydraulically controlled directional valve and the first hydraulic cylinder.

[0016] The fifth balance valve, the seventh balance valve, the first throttle valve, the fourth check valve, and the first hydraulically controlled directional valve are all mounted on the first hydraulic cylinder. The hydraulic control port of the seventh balance valve is located at the inlet end of the fifth balance valve, the hydraulic control port of the fifth balance valve is located at the inlet end of the seventh balance valve, and the hydraulic control port of the first hydraulically controlled directional valve is located at the inlet end of the fifth balance valve.

[0017] The second throttle valve is connected in parallel with a fifth check valve, the outlet of which is located between the second hydraulic directional valve and the second hydraulic cylinder.

[0018] The sixth balance valve, the eighth balance valve, the second throttle valve, the fifth check valve, and the second hydraulically controlled directional valve are all mounted on the second hydraulic cylinder. The hydraulic control port of the eighth balance valve is located at the inlet end of the sixth balance valve, and the hydraulic control port of the sixth balance valve is located at the inlet end of the eighth balance valve. The hydraulic control port of the second hydraulically controlled directional valve is located at the inlet end of the sixth balance valve.

[0019] The hydraulic control ports of the first and second hydraulic control check valves are both located between the first directional control valve and the tenth balance valve. The hydraulic control port of the ninth balance valve is located between the first directional control valve and the tenth balance valve. The hydraulic control port of the tenth balance valve is located between the first directional control valve and the one-way throttle valve.

[0020] The hydraulic control port of the third balancing valve is located between the first balancing valve and the third directional control valve. The hydraulic control port of the first balancing valve is located between the third balancing valve and the third directional control valve. The hydraulic control port of the fourth balancing valve is located between the second balancing valve and the second directional control valve. The hydraulic control port of the second balancing valve is located between the fourth balancing valve and the second directional control valve.

[0021] The beneficial effects of this invention are that the hydraulic cylinder lifting system for the oil and gas drilling rig base can realize the synchronous lifting / lowering of the hydraulic cylinder for the oil and gas drilling rig base and has independent extension and retraction of the hydraulic cylinder and hydraulic cylinder end compensation function. It effectively avoids the hovering, slippage, pipeline explosion, and stalling and sliding that occur when the hydraulic cylinder for the base is lifted and lowered under heavy load, thereby realizing the safe and stable lifting and lowering of the oil and gas drilling rig base. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hydraulic cylinder lifting system for the oil and gas drilling rig base of the present invention.

[0023] In the diagram, 1. First check valve, 2. Second check valve, 3. Third check valve, 4. First directional control valve, 5. Second directional control valve, 6. Third directional control valve, 7. First balancing valve, 8. Second balancing valve, 9. Third balancing valve, 10. Fourth balancing valve, 11. First pressure gauge, 12. Second pressure gauge, 13. Third pressure gauge, 14. Fourth pressure gauge, 15. Fifth balancing valve, 16. Sixth balancing valve, 17. Seventh balancing valve, 18. Eighth balancing valve, 19. First throttling valve. 20. Second throttle valve, 21. Fourth check valve, 22. Fifth check valve, 23. First hydraulic directional valve, 24. Second hydraulic directional valve, 25. First hydraulic cylinder, 26. Second hydraulic cylinder, 27. First hydraulic check valve, 28. Second hydraulic check valve, 29. Ninth balance valve, 30. Tenth balance valve, 31. Synchronization valve, 32. One-way throttle valve, 33. One-way relief valve, 34. Pipeline A, 35. Pipeline B, 36. Pipeline C, 37. Pipeline D, 38. Pipeline E. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] This invention provides a hydraulic cylinder lifting system for the base of an oil and gas drilling rig, the structure of which is as follows: Figure 1 As shown, it includes an oil supply port and an oil return port. High-pressure oil enters from the oil supply port. The oil supply port and the oil outlet are connected by a one-way overflow valve 33. The oil supply port is connected to a first one-way valve 1, a second one-way valve 2, and a third one-way valve 3 through a pipeline A34. A fourth pressure gauge 14 is installed at the oil supply port.

[0026] The first check valve 1 is followed by the first directional control valve 4, the one-way throttle valve 32, the ninth balance valve 29, and the synchronization valve 31. The synchronization valve 31 is followed by the first hydraulically controlled check valve 27 and the second hydraulically controlled check valve 28. The first hydraulically controlled check valve 27 is followed by the seventh balance valve 17, the first throttle valve 19, the first hydraulically controlled directional valve 23, and the rodless port of the first hydraulic cylinder 25. The first throttle valve 19 is connected in parallel with the fourth check valve 21. The outlet of the fourth check valve 21 is located between the first hydraulically controlled directional valve 23 and the first hydraulic cylinder 25; that is, the other port of the throttle valve 19 is connected to the hydraulically controlled directional valve. After the oil circuit of valve 23 merges with the other oil port of check valve 21, it is connected to the plug chamber oil port of the first hydraulic cylinder 25. After the second hydraulic control check valve 28, the eighth balance valve 18, the second throttle valve 20, the second hydraulic control directional valve 24, and the rodless chamber oil port of the second hydraulic cylinder 26 are connected in sequence. The second throttle valve 20 is connected in parallel with the fifth check valve 22. The outlet end of the fifth check valve 22 is located between the second hydraulic control directional valve 24 and the second hydraulic cylinder 26. That is, the other oil port of the throttle valve 20 is connected to the hydraulic control directional valve 24, and the oil circuit merges with the other oil port of check valve 22, and is connected to the plug chamber oil port of the second hydraulic cylinder 26.

[0027] The first directional control valve 4 is also connected to the tenth balance valve 30. The tenth balance valve 30 is connected to the rod-side port of the first hydraulic cylinder 25 through the fifth balance valve 15. The tenth balance valve 30 is connected to the rod-side port of the second hydraulic cylinder through the sixth balance valve 16. The first directional control valve 4 is also connected to the return port. The sixth balance valve 16, the eighth balance valve 18, the second throttle valve 20, the fifth check valve 22, and the second hydraulically controlled directional valve 24 are all mounted on the body of the second hydraulic cylinder 26. The hydraulic control port of the eighth balance valve 18 is located at the inlet end of the sixth balance valve 16, and the hydraulic control port of the sixth balance valve 16 is located at the inlet end of the eighth balance valve 18. The hydraulic control port of the second hydraulically controlled directional valve 24 is located at the inlet end of the sixth balance valve 16. At the inlet end of the balance valve 16, the seventh balance valve 17 is used to safely suspend the first hydraulic cylinder 25 in case of accidents such as the rupture of the oil supply and return pipeline of the first hydraulic cylinder 25. If the pipeline ruptures and the seventh balance valve 17 fails due to jamming, spring breakage, or other malfunctions, the first hydraulic control directional valve 23 will switch, forcing the oil in the plug chamber of the first hydraulic cylinder 25 to be discharged through the first throttle valve 19. Due to the throttling effect of the first throttle valve 19, the first hydraulic cylinder 25 will be lowered smoothly and slowly, thus avoiding the drilling rig base from accidentally falling out of control. At the same time, in case of system failure, the first hydraulic cylinder 25 can also be lowered by manually operating the first throttle valve 19 and the seventh balance valve 17 to release oil and lower the base.

[0028] The fifth balance valve 15, the seventh balance valve 17, the first throttle valve 19, the fourth check valve 21, and the first hydraulically controlled directional valve 23 are all mounted on the body of the first hydraulic cylinder 25. The hydraulic control port of the seventh balance valve 17 is located at the inlet end of the fifth balance valve 15, and the hydraulic control port of the fifth balance valve 15 is located at the inlet end of the seventh balance valve 17. The hydraulic control port of the first hydraulically controlled directional valve 23 is located at the inlet end of the fifth balance valve 15. The eighth balance valve 18 is used to safely suspend the second hydraulic cylinder 26 in case of accidents such as the rupture of the supply and return oil lines. If the pipeline bursts unexpectedly, and the eighth balance valve 18 fails due to jamming, spring breakage, or other malfunctions, the second hydraulic control directional valve 24 will switch, forcing the oil in the plug chamber of the second hydraulic cylinder 26 to be discharged through the second throttle valve 20. Due to the throttling effect of the first throttle valve 19, the second hydraulic cylinder 26 will be lowered smoothly and slowly, thus preventing the drilling rig base from accidentally falling out of control. At the same time, in the event of a system failure, the second hydraulic cylinder 26 can also be lowered by manually operating the second throttle valve 20 and the eighth balance valve 18 to release oil and lower the base.

[0029] The hydraulic control ports of the first hydraulic control check valve 27 and the second hydraulic control check valve 28 are both located between the first reversing control valve 4 and the tenth balance valve 30. The hydraulic control port of the ninth balance valve 29 is located between the first reversing control valve 4 and the tenth balance valve 30. The hydraulic control port of the tenth balance valve 30 is located between the first reversing control valve 4 and the one-way throttle valve 32.

[0030] The second one-way valve 2 is connected in sequence to the second reversing control valve 5 and the fourth balance valve 10. The fourth balance valve 10 is connected between the first hydraulic control one-way valve 27 and the seventh balance valve 17 through the pipeline B35. The first pressure gauge 11 is installed on the pipeline B35.

[0031] The second reversing control valve 5 is also connected to the second balance valve 8. The second balance valve 8 is connected between the tenth balance valve 30 and the sixth balance valve 16 through pipeline C36. The second reversing control valve 5 is also connected to the oil return port. A third pressure gauge 13 is installed on pipeline C36.

[0032] The third check valve 3 is connected in sequence to the third reversing control valve 6 and the third balance valve 9. The third balance valve 9 is connected between the second hydraulic check valve 28 and the eighth balance valve 18 through pipeline D37. The second pressure gauge 12 is installed on pipeline D37.

[0033] The third directional control valve 6 is also connected to the first balance valve 7. The first balance valve 7 is connected to the pipeline C36 via pipeline E38. The third directional control valve 6 is also connected to the return oil port. The hydraulic control port of the third balance valve 9 is located between the first balance valve 7 and the third directional control valve 6. The hydraulic control port of the first balance valve 7 is located between the third balance valve 9 and the third directional control valve 6. The hydraulic control port of the fourth balance valve 10 is located between the second balance valve 8 and the second directional control valve 5. The hydraulic control port of the second balance valve 8 is located between the fourth balance valve 10 and the second directional control valve 5.

[0034] The specifications, dimensions and settings of balance valve 17 and balance valve 1, throttle valve 19 and throttle valve 20, check valve 21 and check valve 22, and hydraulic directional valve 23 and hydraulic directional valve 24 are completely identical.

[0035] The first reversing control valve 4 controls the high-pressure oil to enter the first hydraulic cylinder 25 and the second hydraulic cylinder 26 synchronously through the synchronization valve 31, thereby achieving the synchronous lifting of the drilling rig base. By operating the first reversing control valve 4 in the reverse direction, the high-pressure oil can be controlled to enter the rod chambers of the first hydraulic cylinder 25 and the second hydraulic cylinder 26 simultaneously. The return oil from the rodless chambers of the first hydraulic cylinder 25 and the second hydraulic cylinder 26 is simultaneously collected by the synchronization valve 31, thereby achieving the synchronous lowering of the drilling rig base.

[0036] Operating the second directional control valve 5 controls the high-pressure oil to enter the rodless chamber of the first hydraulic cylinder 25 independently, thereby enabling the first hydraulic cylinder 25 to lift independently. Operating the second directional control valve 5 in the opposite direction controls the high-pressure oil to enter the rod chamber of the first hydraulic cylinder 25, and the oil in the rodless chamber of the first hydraulic cylinder 25 returns through the second directional control valve 5, thereby enabling the first hydraulic cylinder 25 to extend or retract independently.

[0037] Operating the third directional control valve 6 controls the high-pressure oil to enter the rodless chamber of the second hydraulic cylinder 26 independently, thereby enabling the second hydraulic cylinder 26 to lift independently. Operating the third directional control valve 6 in the reverse direction controls the high-pressure oil to enter the rod chamber of the second hydraulic cylinder 26, and the oil in the rodless chamber of the second hydraulic cylinder 26 returns through the third directional control valve 6, thereby enabling the second hydraulic cylinder 26 to extend or retract independently.

[0038] The first hydraulic check valve 27 and the second hydraulic check valve 28 are installed after the synchronization valve 31 to prevent the oil from leaking from the first hydraulic cylinder 25 and the second hydraulic cylinder 26 through the synchronization valve 31, thereby ensuring reliable suspension of the base under heavy load.

[0039] The ninth balance valve 29 and the tenth balance valve 30 are located on the common oil circuit of the two lifting first hydraulic cylinders 25 and the second hydraulic cylinder 26, and are used for load balance control and hovering control during the lifting process of the base.

[0040] The first pressure gauge 11, the second pressure gauge 12, the third pressure gauge 13, and the fourth pressure gauge 14 are used for monitoring the pressure of each oil circuit.

[0041] The first balance valve 7, the second balance valve 8, the third balance valve 9, and the fourth balance valve 10 are used for load balance control and hovering control when the single lifting cylinder of the base is working, and at the same time, they achieve mutual isolation from the synchronous lifting oil circuit.

[0042] The working process of the hydraulic cylinder lifting system for the oil and gas drilling rig base of this invention is as follows: When the drilling rig is synchronously lifted, the first reversing control valve 4 switches to the left position. When the oil supply port pressure exceeds the load pressure, the high-pressure oil opens the first check valve 1 and passes through the first reversing control valve 4, the one-way throttle valve 32, the ninth balance valve 29, and the synchronization valve 31 in sequence, and then splits into two paths. One path enters the lifting first hydraulic control check valve 27, the seventh balance valve 17, the first throttle valve 19, the fourth check valve 21, and the first hydraulic control reversing valve 23 in series. The oil port of the rodless chamber of hydraulic cylinder 25 is connected in series via a pipeline to the second hydraulically controlled check valve 28, the eighth balance valve 18, the second throttle valve 20, the fifth check valve 22, and the second hydraulically controlled directional valve 24, before entering the oil port of the rodless chamber of the second lifting hydraulic cylinder 26. Under the action of high-pressure oil, the fifth balance valve 15, the sixth balance valve 16, and the tenth balance valve 30 open, and oil returns from the rod chambers of both lifting hydraulic cylinders. Due to the synchronous flow diversion effect of the synchronization valve 31, the two lifting cylinders extend synchronously, thereby achieving synchronous lifting of the drilling rig base. When there is a synchronous deviation, after one side of the base is lifted into position, the terminal compensation oil circuit of the synchronization valve 31 automatically opens, thereby realizing the terminal compensation function for the synchronous lifting deviation of the base.

[0043] When the drilling rig is lowered synchronously, the first reversing control valve 4 switches to the right position. After the high-pressure oil opens the first check valve 1, it passes through the first reversing control valve 4 and the tenth balance valve 30 in sequence, and then splits into two paths, which pass through the fifth balance valve 15 and the sixth balance valve 16 respectively into the rod chambers of the first hydraulic cylinder 25 and the second lifting hydraulic cylinder 26. Under the action of the high-pressure oil, the seventh balance valve 17 and the eighth balance valve 18 open, and the first hydraulic control reversing valve 23 and the second hydraulic control reversing valve 24 reverse, so that the return oil from the rodless chambers of the two lifting cylinders bypasses the first throttle valve 19 and the fourth check valve 21, and passes through the seventh balance valve 17, the first hydraulic control check valve 27 and the eighth balance valve 18 and the second hydraulic control check valve 28 respectively, and then enters the synchronization valve 31 and converges into one path, which passes through the ninth balance valve 29 and the one-way throttle valve 32 in sequence. Due to the synchronous flow collection effect of the synchronization valve 31, the two lifting cylinders retract synchronously, thereby realizing the synchronous lowering of the drilling rig base. When the base with synchronous deviation is lowered into place, the terminal compensation oil circuit of the synchronization valve 31 is automatically opened to realize the terminal compensation function of the synchronous lowering deviation of the base.

[0044] When the first hydraulic cylinder 25 for lifting the base needs to operate independently, the second directional valve 5 can be operated to the left position. After the high-pressure oil opens the second check valve 2, it passes through the fourth balance valve 10, the seventh balance valve 17, the first throttle valve 19, the fourth check valve 21, and the first hydraulically controlled directional valve 23 in sequence before entering the rodless chamber of the first hydraulic cylinder 25. Under the action of the high-pressure oil, the fifth balance valve 15 and the second balance valve 8 open in sequence. The oil in the rod chamber of the first hydraulic cylinder 25 for lifting the base returns through the second directional valve 5. At the same time, due to the isolation effect of the second hydraulically controlled check valve 28, the high-pressure oil will not enter the second hydraulic cylinder 26, thereby realizing the independent extension of the first hydraulic cylinder 25 for lifting the base. Similarly, when the second directional valve 5 is operated to the right position, the high-pressure oil opens the second check valve 2 and then passes through the second balance valve 8 and the fifth balance valve 15 in sequence before entering the rod chamber of the lifting first hydraulic cylinder 25. Under the action of the high-pressure oil, the seventh balance valve 17 and the fourth balance valve 10 open the rodless chamber of the lifting first hydraulic cylinder 25 in sequence, and the oil returns through the second directional valve 5. At the same time, due to the one-way locking effect of the second hydraulic control check valve 28 and the third balance valve 9, the second hydraulic cylinder 26 will not move, thus realizing the independent movement of the first hydraulic cylinder 25.

[0045] Similarly, the second hydraulic cylinder 26 is operated independently through the operation of the third directional valve 6.

Claims

1. A hydraulic cylinder lifting system for an oil and gas drilling rig base, comprising an oil supply port and an oil return port, characterized in that, The oil supply port is connected to a first check valve (1), a second check valve (2), and a third check valve (3) via pipeline A. The first check valve (1) is connected in sequence to the first reversing control valve (4), the one-way throttle valve (32), the ninth balance valve (29), and the synchronization valve (31). The synchronization valve (31) is connected in sequence to the first hydraulic control check valve (27) and the second hydraulic control check valve (28). The first hydraulic control check valve (27) is connected in sequence to the seventh balance valve (17), the first throttle valve (19), the first hydraulic control reversing valve (23), and the rodless chamber port of the first hydraulic cylinder (25). The second hydraulic control check valve (28) is connected in sequence to the eighth balance valve (18), the second throttle valve (20), the second hydraulic control reversing valve (24), and the rodless chamber port of the second hydraulic cylinder (26). The first reversing control valve (4) is also connected to the tenth balance valve (30), which is connected to the rod chamber port of the first hydraulic cylinder (25) through the fifth balance valve (15), and the tenth balance valve (30) is connected to the rod chamber port of the second hydraulic cylinder through the sixth balance valve (16). The first reversing control valve (4) is also connected to the return port. The second check valve (2) is followed by a second reversing control valve (5) and a fourth balance valve (10). The fourth balance valve (10) is connected between the first hydraulic check valve (27) and the seventh balance valve (17) via pipeline B. The second reversing control valve (5) is also connected to a second balance valve (8), which is connected between the tenth balance valve (30) and the sixth balance valve (16) via pipeline C. The second reversing control valve (5) is also connected to the return port. The third check valve (3) is followed by the third reversing control valve (6) and the third balance valve (9). The third balance valve (9) is connected between the second hydraulic check valve (28) and the eighth balance valve (18) through pipeline D. The third reversing control valve (6) is also connected to a first balancing valve (7), which is connected to pipeline C via pipeline E. The third reversing control valve (6) is also connected to the return oil port. The first throttle valve (19) is connected in parallel with a fourth check valve (21), and the outlet end of the fourth check valve (21) is located between the first hydraulic control directional valve (23) and the first hydraulic cylinder (25); The fifth balance valve (15), the seventh balance valve (17), the first throttle valve (19), the fourth check valve (21), and the first hydraulic control directional valve (23) are all mounted on the first hydraulic cylinder (25). The hydraulic control port of the seventh balance valve (17) is located at the inlet end of the fifth balance valve (15), the hydraulic control port of the fifth balance valve (15) is located at the inlet end of the seventh balance valve (17), and the hydraulic control port of the first hydraulic control directional valve (23) is located at the inlet end of the fifth balance valve (15).

2. The hydraulic cylinder lifting system for the base of an oil and gas drilling rig according to claim 1, characterized in that, It also includes a one-way relief valve (33), which is connected to the oil supply port and the oil outlet port respectively.

3. The hydraulic cylinder lifting system for the base of an oil and gas drilling rig according to claim 1, characterized in that, A fourth pressure gauge (14) is installed at the oil supply port.

4. The hydraulic cylinder lifting system for the base of an oil and gas drilling rig according to claim 1, characterized in that, A first pressure gauge (11) is installed on pipeline B, a second pressure gauge (12) is installed on pipeline D, and a third pressure gauge (13) is installed on pipeline C.

5. The hydraulic cylinder lifting system for the base of an oil and gas drilling rig according to claim 1, characterized in that, The second throttle valve (20) is connected in parallel with a fifth check valve (22), the outlet of which is located between the second hydraulic control directional valve (24) and the second hydraulic cylinder (26).

6. The hydraulic cylinder lifting system for the base of an oil and gas drilling rig according to claim 5, characterized in that, The sixth balance valve (16), the eighth balance valve (18), the second throttle valve (20), the fifth check valve (22), and the second hydraulic control directional valve (24) are all mounted on the second hydraulic cylinder (26). The hydraulic control port of the eighth balance valve (18) is located at the inlet end of the sixth balance valve (16), and the hydraulic control port of the sixth balance valve (16) is located at the inlet end of the eighth balance valve (18). The hydraulic control port of the second hydraulic control directional valve (24) is located at the inlet end of the sixth balance valve (16).

7. The hydraulic cylinder lifting system for the base of an oil and gas drilling rig according to claim 1, characterized in that, The hydraulic ports of the first hydraulic check valve (27) and the second hydraulic check valve (28) are both located between the first reversing control valve (4) and the tenth balance valve (30). The hydraulic port of the ninth balance valve (29) is located between the first reversing control valve (4) and the tenth balance valve (30). The hydraulic port of the tenth balance valve (30) is located between the first reversing control valve (4) and the one-way throttle valve (32).

8. The hydraulic cylinder lifting system for the base of an oil and gas drilling rig according to claim 1, characterized in that, The hydraulic control port of the third balancing valve (9) is located between the first balancing valve (7) and the third reversing control valve (6). The hydraulic control port of the first balancing valve (7) is located between the third balancing valve (9) and the third reversing control valve (6). The hydraulic control port of the fourth balancing valve (10) is located between the second balancing valve (8) and the second reversing control valve (5). The hydraulic control port of the second balancing valve (8) is located between the fourth balancing valve (10) and the second reversing control valve (5).

Images