Inner curve radial plunger hydraulic motor top direct-drive drilling device

Abstract

The invention relates to an inner curve radial plunger hydraulic motor top direct-drive well drilling device, and belongs to the technical field of petroleum well drilling equipment, the inner curve radial plunger hydraulic motor top direct-drive well drilling device comprises a lifting ring, a motor bracket is arranged below the lifting ring, a top drive hydraulic motor is installed on the motor bracket, and a transmission shaft is arranged in the top drive hydraulic motor; the transmission shaft penetrates through the top drive hydraulic motor, and the transmission shaft is arranged in a hollow mode. The driving structure is simplified, and the transmission efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of oil drilling equipment, and particularly to a top direct drive drilling device for an internal curve radial piston hydraulic motor. Background Art

[0002] In the oil drilling industry, the top drive motor is one of the key equipment, serving as a reliable and efficient driving device to provide power for drilling operations.

[0003] The traditional driving device for drilling operations drives a gearbox through an electric motor or a high-speed hydraulic motor. The pinion of the gearbox drives the large gear, and the rotation of the large gear drives the drill pipe to rotate, thereby realizing the drilling operation.

[0004] However, this driving method has a complex structure and too many corresponding transmission parts, and a large amount of resistance needs to be overcome during the transmission process, resulting in low transmission efficiency and poor stability. Summary of the Invention

[0005] In order to simplify the driving structure and improve the transmission efficiency, the present application provides a top direct drive drilling device for an internal curve radial piston hydraulic motor.

[0006] The top direct drive drilling device for an internal curve radial piston hydraulic motor provided by the present application adopts the following technical solutions: A top direct drive drilling device for an internal curve radial piston hydraulic motor includes a lifting ring. A motor bracket is provided below the lifting ring. A top drive hydraulic motor is installed on the motor bracket. A transmission shaft is provided inside the top drive hydraulic motor. The transmission shaft penetrates through the top drive hydraulic motor and is hollow inside.

[0007] By adopting the above technical solutions, the transmission shaft is used to coaxially connect the drill pipe. The transmission shaft is installed inside the top drive hydraulic motor and is directly driven by the top drive hydraulic motor, realizing the direct drive of the drill pipe, simplifying the transmission chain, reducing energy loss, and thus improving the transmission efficiency. In addition, the transmission shaft is hollow inside, allowing the drilling fluid to flow inside the transmission shaft and simultaneously cooling the top drive hydraulic motor.

[0008] Optionally, the top drive hydraulic motor includes an internal curve cam ring provided on the motor bracket. A cylinder block is provided inside the internal curve cam ring. A plurality of plungers are provided on the cylinder block and face and abut against the inner side surface of the internal curve cam ring. A roller is further provided between the plunger and the internal curve cam ring. The transmission shaft is installed at the center inside the cylinder block through key connection. An oil circuit block for driving the plunger is further provided on the motor bracket.

[0009] By adopting the above technical solution, hydraulic oil enters the oil circuit block and drives the plunger to move outwards. The roller contacts the inner curve cam ring and rolls along the track, thereby driving the cylinder block to rotate, so that the cylinder block drives the transmission shaft to rotate, and finally provides power for the drilling device, realizing efficient conversion of hydraulic energy into mechanical energy. In addition, the use of an inner curve radial piston hydraulic motor realizes direct drive with low speed and high torque, without a complex reduction mechanism, simplifies the transmission chain, improves the transmission efficiency, and reduces the probability of energy loss and equipment failure.

[0010] Optionally, a fixed pin shaft is provided between the lifting ring and the motor bracket. One end of the motor bracket is also provided with an anti-rotation pin shaft, and a limit tube is provided at the anti-rotation pin shaft. The anti-rotation pin shaft is inserted into the limit tube.

[0011] By adopting the above technical solution, through the lifting ring and the motor bracket, the top drive hydraulic motor can be more conveniently and stably installed on the top of the drilling equipment, and thus can bear greater axial and radial loads.

[0012] Optionally, the oil circuit block includes an oil inlet and an oil return port opened on the motor bracket. Both the oil inlet and the oil return port are connected with a flow distribution mechanism, and the flow distribution mechanism communicates with the corresponding plunger.

[0013] By adopting the above technical solution, the hydraulic oil reaches the flow distribution mechanism through the oil circuit block. The flow distribution mechanism distributes the high-pressure oil to each plunger, pushes the plunger to move outwards, the roller contacts the inner curve cam ring and rolls along the track, driving the cylinder block to rotate, so that the torque of the cylinder block is transmitted to the drill pipe to realize the drilling work.

[0014] Optionally, a sealing mechanism is provided at the top of the cylinder block. The sealing mechanism includes an end cover arranged on the motor bracket. A stationary ring is provided on one side of the end cover facing the cylinder block. A rotating ring coaxial with the stationary ring is provided on the transmission shaft. Through holes coaxial with each other are opened on the rotating ring, the stationary ring and the end cover, and the through holes communicate with the hollow part of the rotating shaft. A sleeve is installed on one side of the end cover away from the stationary ring, and the sleeve communicates with the through hole. A sealing compensation part is also provided on the stationary ring.

[0015] By adopting the above technical solution, the sealing compensation part presses the stationary ring against the rotating ring. When the drilling fluid flows in the transmission shaft and the through hole, the stationary ring and the rotating ring are closely attached to prevent leakage. The sleeve extends the flow path of the drilling fluid, making the flow of the drilling fluid more regular.

[0016] Optionally, a plurality of grooves evenly distributed around the axis of the stationary ring are opened on one side of the stationary ring facing the end cover. The sealing compensation part is arranged as a spring, and the spring is installed in the groove and is connected to both the stationary ring and the end cover at the same time.

[0017] By adopting the above technical solution, when the top drive hydraulic motor is operating, the spring forms a preload force, so that the end faces of the dynamic ring and the static ring are always in close contact, and play an automatic calibration and compensation role, thereby forming a stable sealing state to prevent fluid leakage.

[0018] Optionally, a side of the dynamic ring close to the static ring is made of ceramic silicon carbide wear-resistant material, and a side of the static ring close to the dynamic ring is made of copper alloy material.

[0019] By adopting the above technical solution, the dynamic ring is made of ceramic silicon carbide wear-resistant material, which has ultra-high hardness and can effectively reduce friction and wear, thereby extending the service life. The static ring is made of copper alloy, which makes the static ring have high hardness, wear resistance, corrosion resistance and other characteristics. The materials of the static ring and the dynamic ring make the sealing surfaces of the static ring and the dynamic ring difficult to be damaged, thereby ensuring the sealing effect.

[0020] Optionally, a fixed sealing ring coaxial with the transmission shaft is provided between the dynamic ring and the transmission shaft, and a sliding sealing ring coaxial with the through hole is provided between the static ring and the end cover.

[0021] By adopting the above technical solution, the fixed sealing ring seals the gap between the dynamic ring and the transmission shaft. In addition, the static ring always keeps abutting against the dynamic ring under the action of the sealing compensation part. The static ring will slide relative to the end cover. At this time, the sliding sealing ring can seal the sliding part between the static ring and the end cover, thereby allowing the drilling fluid to flow in the through hole, thereby preventing leakage of the drilling fluid.

[0022] Optionally, an annular connecting groove is further provided at one end of the transmission shaft away from the end cover, the connecting groove gradually inclines toward the axial direction of the transmission shaft in the direction away from the end cover, and a thread for connecting a drill rod is provided on the side of the connecting groove.

[0023] By adopting the above technical solution, the transmission shaft provided with the connecting groove can be quickly plugged into other equipment. At the same time, the setting of the thread enables the transmission shaft to be connected with other equipment through threaded connection, thereby improving the disassembly and assembly efficiency of the transmission shaft and other equipment.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: The transmission shaft is installed inside the top drive hydraulic motor and is directly driven by the top drive hydraulic motor, which realizes the direct drive of the drill pipe, simplifies the transmission chain, reduces energy loss, and thus improves transmission efficiency; The drive shaft is hollow inside, allowing the drilling fluid to flow inside the drive shaft and cool the top drive hydraulic motor at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0026] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0027] Explanation of reference numerals: 1, lifting ring; 2, motor bracket; 21, fixed pin shaft; 22, anti-rotation pin shaft; 3, top drive hydraulic motor; 31, inner curve cam ring; 32, cylinder block; 33, plunger; 34, oil circuit block; 341, oil inlet; 342, oil return port; 343, flow distribution mechanism; 35, roller; 4, transmission shaft; 41, connecting groove; 5, sealing mechanism; 51, end cover; 52, stationary ring; 53, moving ring; 54, spring; 55, fixed sealing ring; 56, sliding sealing ring. Specific embodiments

[0028] The present application will be further described in detail below with reference to the accompanying drawings.

[0029] An embodiment of the present application discloses a top drive direct-drilling device for an inner curve radial piston hydraulic motor. Referring to Figure 1 and Figure 2 , a top drive direct-drilling device for an inner curve radial piston hydraulic motor includes a lifting ring 1. A motor bracket 2 is provided below the lifting ring 1. A fixed pin shaft 21 is provided between the lifting ring 1 and the motor bracket 2. The fixed pin shaft 21 passes through and fixedly connects the lifting ring 1 and the motor bracket 2 at the same time. An anti-rotation pin shaft 22 is further installed at one end of the motor bracket 2. A limit tube is provided at the anti-rotation pin shaft 22. The anti-rotation pin shaft 22 is inserted into the limit tube. The limit tube is installed on the oil drilling equipment for maintaining the effective transmission of torque.

[0030] A top drive hydraulic motor 3 is installed on the motor bracket 2. A transmission shaft 4 is provided inside the top drive hydraulic motor 3. The transmission shaft 4 penetrates through the top drive hydraulic motor 3, and the transmission shaft 4 is hollow inside. The transmission shaft 4 is used to coaxially connect the drill pipe. The transmission shaft 4 is hollow inside. When the drilling fluid flows inside the transmission shaft 4, it plays a role in cooling the top drive hydraulic motor 3. Among them, the transmission shaft 4 is installed inside the top drive hydraulic motor 3 and is directly driven by the top drive hydraulic motor 3, realizing the direct drive of the drill pipe, simplifying the transmission chain, and improving the transmission efficiency.

[0031] The top drive hydraulic motor 3 includes an inner curve cam ring 31 provided on the motor bracket 2. The inner curve cam ring 31 is coaxially arranged with the transmission shaft 4. A cylinder block 32 is provided inside the inner curve cam ring 31. A plurality of uniformly arranged plunger holes 33 are opened on the cylinder block 32. All the plunger holes 33 are also uniformly distributed around the transmission shaft 4. A plunger 33 slidingly connected and abutting against the inner side surface of the inner curve cam ring 31 is arranged inside the plunger hole 33. A roller 35 is further provided between the plunger 33 and the inner curve cam ring 31 for rolling along the track of the inner curve cam ring 31. The transmission shaft 4 is arranged at the center inside the cylinder block 32, and the transmission shaft 4 is key-connected to the cylinder block 32. An oil circuit block 34 for driving the plunger 33 is further provided on the motor bracket 2.

[0032] It enters the oil circuit block 34 through the hydraulic oil and drives the plunger 33 to move outwards. The roller 35 contacts the inner curve cam ring 31 and rolls along the track, thereby driving the cylinder block 32 to rotate. As a result, the cylinder block 32 drives the transmission shaft 4 to rotate, ultimately providing the power of direct drive with low speed and high torque for the drilling device. At the same time, the direct drive reduces the radial load on the transmission shaft 4, thereby reducing the possibility of damage to the transmission shaft 4.

[0033] The oil circuit block 34 includes an oil inlet 341 and an oil return port 342 opened on the motor bracket 2. Both the oil inlet 341 and the oil return port 342 are connected with a flow distribution mechanism 343, and the flow distribution mechanism 343 communicates with the corresponding plunger 33 holes. The hydraulic oil reaches the flow distribution mechanism 343 through the oil circuit block 34. The flow distribution mechanism 343 distributes the high-pressure oil to each plunger 33, pushing the plunger 33 to move outwards, causing the roller 35 to contact the inner curve cam ring 31 and roll within the track of the inner curve cam ring 31 of the stator. The movement of the plunger 33 and the roller 35 drives the cylinder block 32 to rotate, so that the torque of the cylinder block 32 is transmitted to the drill pipe to realize the drilling work.

[0034] A sealing mechanism 5 is provided at the top of the cylinder block 32. The sealing mechanism 5 includes an end cover 51 provided on the motor bracket 2. The end cover 51 is fixed to the cylinder block 32 by bolts. A stationary ring 52 is provided on the side of the end cover 51 facing the cylinder block 32. The stationary ring 52 is fixed to the end cover 51 by socket head cap screws with shoulder. A moving ring 53 coaxial with the stationary ring 52 is provided on the transmission shaft 4. The moving ring 53 is fixed to the transmission shaft 4 by high-strength bolts. Through holes coaxial with each other are opened on the moving ring 53, the stationary ring 52 and the end cover 51, and the through holes communicate with the hollow part of the rotating shaft. A sleeve is installed on the side of the end cover 51 away from the stationary ring 52, and the sleeve communicates with the through holes. A sealing compensator is also provided on the stationary ring 52.

[0035] The sealing compensator presses the stationary ring 52 against the moving ring 53. When the drilling fluid flows in the transmission shaft 4 and the through holes, the stationary ring 52 and the moving ring 53 are closely attached to prevent leakage. Through the lifting ring 1, the motor bracket 2 and the sealing mechanism 5, the top drive hydraulic motor 3 can be more conveniently and stably installed on the top of the drilling equipment, thereby bearing greater axial and radial loads and reducing the possibility of damage to the top drive hydraulic motor 3.

[0036] A plurality of grooves evenly distributed around the axis of the stationary ring 52 are opened on the side of the stationary ring 52 facing the end cover 51. The sealing compensator is set as a spring 54, and the spring 54 is installed in the groove. The spring 54 is connected to both the stationary ring 52 and the end cover 51 at the same time. When the top drive hydraulic motor 3 operates, the spring 54 forms a pre-tightening force, making the end faces of the moving ring 53 and the stationary ring 52 always closely attached, and playing an automatic calibration and compensation role, thereby forming a stable sealing state to prevent fluid leakage.

[0037] One side of the moving ring 53 close to the stationary ring 52 is made of wear-resistant ceramic silicon carbide material, and one side of the stationary ring 52 close to the moving ring 53 is made of copper alloy material. The materials of the stationary ring 52 and the moving ring 53 make it difficult for the sealing surfaces of the stationary ring 52 and the moving ring 53 to be damaged, ensuring the sealing effect.

[0038] In order to improve the sealing performance of the sealing mechanism 5, a fixed sealing ring 55 coaxial with the transmission shaft 4 is provided between the moving ring 53 and the transmission shaft 4, and a sliding sealing ring 56 coaxial with the through hole is provided between the stationary ring 52 and the end cover 51. The fixed sealing ring 55 blocks the gap between the moving ring 53 and the transmission shaft 4. In addition, the stationary ring 52 always abuts against the moving ring 53 under the action of the sealing compensator. The stationary ring 52 will slide relative to the end cover 51. At this time, the sliding sealing ring 56 can block the sliding part between the stationary ring 52 and the end cover 51, so that the drilling fluid flows in the through hole, thereby preventing the leakage of the drilling fluid.

[0039] One end of the transmission shaft 4 away from the end cover 51 is also provided with an annular connecting groove 41. The connecting groove 41 gradually inclines towards the axis direction of the transmission shaft 4 along the direction away from the end cover 51, and threads for connecting the drill pipe are provided on the side surface of the connecting groove 41. The arrangement of the connecting groove 41 enables the transmission shaft 4 to be quickly inserted into other equipment. The transmission shaft 4 is threadedly connected with other equipment and transmits power, improving the disassembly and assembly efficiency of the transmission shaft 4 and other equipment.

[0040] The implementation principle of an inner curve radial piston hydraulic motor top direct drive drilling device in an embodiment of this application is as follows: Hydraulic oil reaches the holes of the pistons 33 through the oil circuit block 34 and the flow distribution mechanism 343, thereby driving the pistons 33 to move outwards, making the rollers 35 contact the inner curve cam ring 31 and roll in the inner curve track of the stator. The movement of the pistons 33 and the rollers 35 drives the cylinder block 32 to rotate, so that the torque of the cylinder block 32 is transmitted to the drill pipe, realizing the reciprocating movement of the drilling work. Furthermore, the cylinder block 32 rotates, the cylinder block 32 drives the transmission shaft 4 to rotate, and then drives the drill pipe to work.

[0041] The above are all preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A direct-drive drilling device at the top of an internal curve radial piston hydraulic motor, characterized in that: It includes a lifting ring (1), a motor bracket (2) is provided below the lifting ring (1), a top drive hydraulic motor (3) is installed on the motor bracket (2), a transmission shaft (4) is arranged inside the top drive hydraulic motor (3), the transmission shaft (4) penetrates through the top drive hydraulic motor (3), and the transmission shaft (4) is hollow.

2. The top direct drive drilling device of an internal curve radial piston hydraulic motor according to claim 1, characterized in that: The top drive hydraulic motor (3) includes an inner curve cam ring (31) arranged on the motor bracket (2), a cylinder block (32) is arranged inside the inner curve cam ring (31), a plurality of plungers (33) facing and abutting against the inner side surface of the inner curve cam ring (31) are arranged on the cylinder block (32), a roller (35) is further arranged between the plunger (33) and the inner curve cam ring (31), the transmission shaft (4) is installed at the center inside the cylinder block (32) through key connection, and an oil circuit block (34) for driving the plunger (33) is further arranged on the motor bracket (2).

3. The top direct drive drilling device of an internal curve radial piston hydraulic motor according to claim 2, characterized in that: A fixed pin shaft (21) is arranged between the lifting ring (1) and the motor bracket (2), an anti-rotation pin shaft (22) is arranged at one end of the motor bracket (2), a limiting tube is arranged at the anti-rotation pin shaft (22), and the anti-rotation pin shaft (22) is inserted into the limiting tube.

4. The top direct drive drilling device of an internal curve radial piston hydraulic motor according to claim 2, characterized in that: The oil circuit block (34) includes an oil inlet (341) and an oil return port (342) opened on the motor bracket (2), a flow distribution mechanism (343) is connected to both the oil inlet (341) and the oil return port (342), and the flow distribution mechanism (343) is communicated to the corresponding plunger (33).

5. The top direct drive drilling device of an internal curve radial piston hydraulic motor according to claim 4, characterized in that: A sealing mechanism (5) is arranged at the top of the cylinder block (32), the sealing mechanism (5) includes an end cover (51) arranged on the motor bracket (2), a static ring (52) is arranged on the side of the end cover (51) facing the cylinder block (32), a dynamic ring (53) coaxial with the static ring (52) is arranged on the transmission shaft (4), through holes coaxial with each other are opened on the dynamic ring (53), the static ring (52) and the end cover (51), and the through holes are communicated with the hollow part of the rotating shaft, a sleeve is installed on the side of the end cover (51) away from the static ring (52), and the sleeve is communicated with the through hole, and a sealing compensation part is further arranged on the static ring (52).

6. The top direct drive drilling device of an internal curve radial piston hydraulic motor according to claim 5, characterized in that: A plurality of grooves evenly distributed around the axis of the static ring (52) are opened on the side of the static ring (52) facing the end cover (51), the sealing compensation part is arranged as a spring (54), and the spring (54) is installed in the groove, and the spring (54) is connected to both the static ring (52) and the end cover (51) at the same time.

7. The top direct drive drilling device of an internal curve radial piston hydraulic motor according to claim 6, characterized in that: The side of the dynamic ring (53) close to the static ring (52) is made of ceramic silicon carbide wear-resistant material, and the side of the static ring (52) close to the dynamic ring (53) is made of copper alloy material.

8. A top direct drive drilling device for an internal curve radial piston hydraulic motor according to claim 6, characterized in that: A fixed sealing ring (55) coaxial with the transmission shaft (4) is arranged between the dynamic ring (53) and the transmission shaft (4), and a sliding sealing ring (56) coaxial with the through hole is arranged between the static ring (52) and the end cover (51).

9. A top direct drive drilling device for an internal curve radial piston hydraulic motor according to claim 6, characterized in that: One end of the transmission shaft (4) away from the end cover (51) is further provided with an annular connecting groove (41). The connecting groove (41) gradually inclines towards the axis direction of the transmission shaft (4) along the direction away from the end cover (51), and threads for connecting the drill pipe are provided on the side surface of the connecting groove (41).

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