Rotatable underground hydraulic hammering device

Abstract

The utility model discloses a rotatable underground hydraulic hammering device which comprises an upper connector, a lower connector, a lower connector and a hydraulic cylinder, a flow dividing connector is installed on the upper connector, and the flow dividing connector is sequentially connected with an outer cylinder and a limiting connector; a valve seat mechanism is installed in the flow dividing connector, one end of the valve seat mechanism abuts against the upper connector, the other end of the valve seat mechanism abuts against the valve rod, a slidable shuttle rod and a piston are installed in the outer cylinder, the upper end of the shuttle rod and the lower end of the valve rod can form an annular sealing environment, and the lower end of the shuttle rod and the upper end of the sealing seat can form an annular sealing environment. A torsion sleeve is installed on the limiting connector, and a lower connector is installed on the torsion sleeve. Pressure is pumped into the tool from the upper connector, the lower connector and the tool connected with the lower connector can generate high-frequency axial jarring force and high-frequency radial and one-way rotation at the same time, and when the lower end is connected with a milling tool, the high-frequency axial jarring force can be transmitted to the blocked position, and the high-frequency radial and one-way rotation can be transmitted to the blocked position. And a blocked position can be quickly milled. And the success rate and the working efficiency of blockage-encountering jam release are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of downhole tools, and in particular to a rotatable downhole hydraulic hammer device. Background Technology

[0002] During coiled tubing operations, stuck pipe accidents frequently occur due to wellbore structure issues or improper operation. Conventional swivel hammers are widely used as effective tools for unsticking. Hydraulic swivel hammers offer advantages such as easy adjustment of release force during drilling, good sealing structure, and stable performance. They solve the problem of uncontrollable mechanical swivel hammers after being installed in the well, providing the ability to handle stuck pipe accidents immediately and significantly reducing the cost of coiled tubing operations.

[0003] Existing conventional hydraulic shock absorbers are characterized by a large single impact force, but each shock to release the stuck material requires the shock spindle to release upwards or downwards to generate the instantaneous impact force. Both upward and downward releases of the shock spindle take time, resulting in long shock release times and low operational efficiency. Furthermore, when encountering obstruction downhole and the hydraulic shock absorber is unable to release the stuck material, milling operations are required at the obstructed location. However, the structure of conventional hydraulic shock absorbers cannot perform these milling operations. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, the purpose of this utility model is to provide a rotatable downhole hydraulic hammer device.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A rotatable downhole hydraulic hammer device includes: an upper connector, on which a flow divider is mounted, and an outer cylinder and a limiting connector are sequentially connected to the flow divider; a valve seat mechanism is installed inside the flow divider, and a valve stem is connected to the valve seat mechanism; a slidable shuttle rod and a piston are installed inside the outer cylinder, wherein the upper end of the shuttle rod and the lower end of the valve stem can form an annular sealing environment, and the lower end of the shuttle rod and the upper end of the sealing seat can form an annular sealing environment; a torsion sleeve is mounted on the limiting connector, and a lower connector is mounted on the torsion sleeve.

[0007] The valve seat mechanism includes: a valve spring seat fixedly installed in the diverter, a valve spring installed on the valve spring seat, a valve seat installed on the valve spring, a valve stem installed on the valve seat, and the valve seat and valve stem pressing against each other to form an annular sealing surface.

[0008] The inner wall of the flow divider is provided with a flow divider upper end face for limiting the valve seat and a flow divider lower end face for limiting the valve stem; the interior of the flow divider is provided with a flow divider hole for transmitting pressure.

[0009] The valve stem has an upper arc surface at its end, and the valve seat has a flared opening. The upper arc surface and the flared opening can form an annular sealing surface.

[0010] One end of the shuttle is provided with a limiting platform, and the middle part of the shuttle is provided with a protrusion. A main spring is installed between the limiting platform and the protrusion. A secondary spring is sleeved at the end of the shuttle. The inner wall of the outer cylinder is provided with a first, second, and third limiting platform for limiting the limiting platform, the protrusion, and the end of the secondary spring, respectively. The end of the shuttle passes through the third limiting platform and contacts the piston.

[0011] A main spring seat is installed in the middle of the shuttle rod, the main spring is installed in the main spring seat, a secondary spring retaining ring is installed between the secondary spring and the main spring seat, and a washer is installed between the main spring and the protrusion.

[0012] The outer circle of the shuttle rod has a flow groove along the radial direction to ensure that the pumping pressure can pass through quickly, and the end of the shuttle rod is provided with a lower arc surface.

[0013] A sealing seat is installed at the end of the piston, and the end of the shuttle rod can contact the sealing seat. A support ring, a slip ring, and an elastic retaining ring are installed between the piston and the inner wall of the outer cylinder. The sealing seat is provided with a lower flared opening that matches the lower arc surface. When the shuttle rod contacts the sealing seat, the lower arc surface abuts against the lower flared opening.

[0014] A rotating shaft is installed on the torsion sleeve, and a spiral groove is provided on the limiting joint. The extended end of the rotating shaft is engaged in the spiral groove. A bushing is provided on the rotating shaft, and a spacer ring and a dustproof ring are installed between the limiting joint and the torsion sleeve.

[0015] The lower connector is fitted with a sliding sleeve at one end of the torsion sleeve and a one-way bearing at the other end.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention provides a rotatable downhole hydraulic hammer device. By pumping pressure from the upper connector to the interior, the lower connector and the tool connected to it simultaneously generate high-frequency axial impact force and high-frequency radial and unidirectional rotation. When a milling tool is connected to the lower end, it can both transmit high-frequency axial impact force to the obstructed location and perform rapid milling at the obstructed location. This significantly improves the success rate and efficiency of unblocking and re-jamming operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the free state structure of the rotatable downhole hydraulic hammer device of this utility model.

[0019] Figure 2 This is a schematic diagram showing the pressure difference generated at the upper and lower ends of the sealing seat under the pumping pressure state of the rotatable downhole hydraulic hammer device of this utility model.

[0020] Figure 3 This is a schematic diagram showing the pressure difference balance between the upper and lower ends of the sealing seat under the pumping pressure state of the rotatable downhole hydraulic hammer device of this utility model.

[0021] Figure 4 This is a schematic diagram of the diversion joint structure of the rotatable downhole hydraulic hammer device of this utility model;

[0022] Figure 5 This is a schematic diagram of the valve stem structure of the rotatable downhole hydraulic hammer device of this utility model;

[0023] Figure 6 This is a schematic diagram of the shuttle structure of the rotatable downhole hydraulic hammer device of this utility model;

[0024] Figure 7 This is a schematic diagram of the spiral groove structure of the rotatable downhole hydraulic hammer device of this utility model;

[0025] Figure 8 This is a schematic diagram of the rotation direction of the one-way bearing assembly of the rotatable downhole hydraulic hammer device of this utility model. Figure 1 ;

[0026] Figure 9 This is a schematic diagram of the rotation direction of the one-way bearing assembly of the rotatable downhole hydraulic hammer device of this utility model. Figure 2 .

[0027] In the diagram, 1—upper connector, 2—diverter connector, 3—valve spring seat, 4—valve spring, 5—valve seat, 6—valve stem, 7—shuttle rod, 8—washer ring, 9—outer cylinder, 10—main spring, 11—main spring seat, 12—secondary spring retaining ring, 13—secondary spring, 14—sealing seat, 15—piston, 16—rotating shaft, 17—limiting connector, 18—torsion sleeve, 19—one-way bearing assembly, 20—lower connector. 21—Top screw, 22—Elastic retaining ring, 23—Slip ring, 24—Support ring, 25—Sliding sleeve, 26—Shaft sleeve, 27—Spacer ring, 28—Dustproof ring, 141—Lower flared mouth, 171—Spiral groove; 202—Upper end face of the flow divider, 203—Lower end face of the flow divider, 501—Upper flared mouth, 601—Upper arc surface, 701—Flow groove, 702—Lower arc surface; 703—Limiting platform; —Protrusion. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0029] like Figure 1-3 As shown, this utility model provides a rotatable downhole hydraulic hammer device, including: an upper connector 1, on which a diversion connector 2 is installed, and an outer cylinder 9 and a limiting connector 17 are connected in sequence to the outside of the diversion connector 2; a valve seat mechanism is installed inside the diversion connector 2, and the valve seat mechanism abuts against a valve stem 6; a slidable shuttle rod 7 and a piston 15 are installed inside the outer cylinder 9, one end of the shuttle rod 7 abuts against the valve stem 6, and the other end can make sealing contact with the end of the sealing seat 14; a rotatable torsion sleeve 18 is installed inside the limiting connector 17, and a lower connector 20 is installed on the torsion sleeve 18.

[0030] Specifically, in this utility model, the valve seat mechanism includes: a valve spring seat 3 fixedly installed in the diverter 2, a valve spring 4 installed on the valve spring seat 3, a valve seat 5 installed on the valve spring 4, and a valve stem 6 installed on the valve seat 5.

[0031] In this utility model, the upper connector 1 and the diverter connector 2 are connected by threads, and the diverter connector 2 is screwed with a set screw to prevent the threads from loosening; the upper connector 1 and the diverter connector 2 are sealed by a sealing ring; the diverter connector 2 and the outer cylinder 9 are connected by threads and sealed by a sealing ring; the outer cylinder 9 and the limiting connector 17 are connected by threads and sealed by a sealing ring; the piston 15 and the lower connector 20 are connected by threads, and the piston 15 is screwed with a set screw to prevent the threads from loosening; the torsion sleeve 18 is fitted onto the thinner end of the lower connector 20 and sealed by a sealing ring.

[0032] like Figure 4 As shown, the inner wall of the diversion connector 2 is provided with a diversion upper end surface 202 for limiting the valve seat 5 and a diversion lower end surface 203 for limiting the valve stem 6. When the lower end surface of the valve seat 5 is against the diversion upper end surface 202, the valve seat 5 stops descending.

[0033] The flow divider 2 has a flow divider hole 201 inside, and the pressure is output through the flow divider hole 201 on the flow divider 2, so that the valve stem 6 and shuttle rod 7 continue to move downward under pressure. A set screw 21 is installed between the flow divider 2 and the upper connector 1.

[0034] like Figure 5As shown, in this utility model, the end of the valve stem 6 is provided with an upper arc surface 601, and the valve seat 5 is provided with a flared mouth 501, and the upper arc surface 601 and the flared mouth 501 are sealed and matched.

[0035] In addition, such as Figure 6 As shown, a limiting platform 703 is provided at one end of the shuttle rod 7, and a protrusion 704 is provided in the middle of the shuttle rod 7. A main spring 10 is installed between the limiting platform 703 and the protrusion 704. A secondary spring 13 is sleeved at the end of the shuttle rod 7. The inner wall of the outer cylinder 9 is provided with first, second, and third limiting platforms for limiting the limiting platform 703, the protrusion 704, and the end of the secondary spring 13, respectively. The end of the shuttle rod 7 passes through the third limiting platform and contacts the piston 15.

[0036] Furthermore, a main spring seat 11 is installed in the middle of the shuttle 7, the main spring 10 is installed inside the main spring seat 11, and a secondary spring retaining ring 12 is installed between the secondary spring 13 and the main spring seat 11. A washer 8 is installed between the main spring 10 and the protrusion.

[0037] like Figure 6 As shown, the shuttle 7 has a flow groove 701 formed radially, and a lower arc surface 702 is provided at the end of the shuttle 7. The lower arc surface 702 contacts the piston 15.

[0038] A sealing seat 14 is installed at the end of the piston 15, and the end of the shuttle rod 7 contacts the sealing seat 14. Furthermore, in this invention, the sealing seat 14 is provided with a lower flared opening 141 that mates with the lower arc surface 702. When the shuttle rod 7 contacts the sealing seat 14, the lower arc surface 702 and the lower flared opening 141 form an annular sealing surface.

[0039] A set screw 21 is installed between the piston 15 and the lower connector 20. A support ring 24, a slip ring 23, and an elastic retaining ring 22 are installed between the piston 15 and the inner wall of the outer cylinder 9. The slip ring 23 and the support ring 24 are installed in the right end hole of the outer cylinder 9, where the slip ring 23 serves a sealing function and the support ring 24 serves a straightening function. The sealing seat 14 is installed in the upper end hole of the piston and is limited by the elastic retaining ring 22. The sealing seat 14 and the piston 15 are sealed by the sealing ring.

[0040] like Figure 7 As shown, a rotating shaft 16 is mounted on the torsion sleeve 18, and a spiral groove 171 is provided on the limiting joint 17. The protruding end of the rotating shaft 16 is engaged in the spiral groove 171. Further, a bushing 26 is provided on the rotating shaft 16, and a spacer ring 27 and a dustproof ring 28 are installed between the limiting joint 17 and the torsion sleeve 18.

[0041] like Figure 8 , 9 As shown, the lower connector 20 and the torsion sleeve 18 are equipped with a sliding sleeve 25 at one end and a one-way bearing 19 at the other end. When the one-way bearing 19 rotates in reverse, the rotor opens to prevent reverse rotation. When the one-way bearing 19 rotates in the forward direction, the rotor retracts and rotates smoothly in the forward direction.

[0042] When the pump pressure is not applied, the main spring 10 and the auxiliary spring 13 push the shuttle rod 7. The upper end face of the shuttle rod 7 abuts against the lower end face of the valve stem 6. The upper arc surface 601 of the valve stem 6 abuts against the upper flared opening 501 of the valve seat 5. The upper end face of the valve seat 5 abuts against the valve spring 4. The upper end of the valve spring 4 abuts against the valve spring seat 3. The valve spring seat 3 abuts against the lower end face of the upper connector 1.

[0043] Because the thrust generated by the combination of the main spring 10 and the auxiliary spring 13 is much greater than that of the valve spring 4, an annular sealing surface is formed between the upper arc surface 601 of the valve stem 6 and the upper flared opening 501 of the valve seat 5. Therefore, the valve stem 6 and the valve seat 5 can form an annular sealing structure, which can generate thrust on the valve stem 6 and the shuttle rod 7 when pumping pressure. At this time, the lower arc surface 702 of the shuttle rod 7 is not in contact with the lower flared opening 141 of the sealing seat 14, so the space at both ends of the lower flared opening 141 is in a state of pressure balance.

[0044] The torsion sleeve 18 and the lower end face of the limiting joint 17 are in a tight fit. The rotating shaft 16 is located at the upper end of the spiral groove 171 in the limiting joint 17.

[0045] The upper connector 1 and the diverter connector 2 are connected by threads, and the diverter connector 2 is screwed with a set screw to prevent the threads from loosening; the upper connector 1 and the diverter connector 2 are sealed by a sealing ring; the diverter connector 2 and the outer cylinder 9 are connected by threads and sealed by a sealing ring; the outer cylinder 9 and the limit connector 17 are connected by threads and sealed by a sealing ring; the piston 15 and the lower connector 20 are connected by threads, and the piston 15 is screwed with a set screw to prevent the threads from loosening; the torsion sleeve 18 is fitted onto the thinner end of the lower connector 20 and sealed by a sealing ring.

[0046] The slip ring 23 and the support ring 24 are installed in the right end hole of the outer cylinder 9. The slip ring 23 plays a sealing role, and the support ring 24 plays a straightening role. The sealing seat 14 is installed in the upper end hole of the piston and is limited by the elastic retaining ring 22. The sealing seat 14 and the piston are sealed by the sealing ring.

[0047] Under non-pumped pressure, the main spring 10 and auxiliary spring 13 push the shuttle rod 7. The upper end face of the shuttle rod 7 abuts against the lower end face of the valve stem 6. The upper arc surface 601 of the valve stem 6 abuts against the upper flared end 501 of the lower end face of the valve seat 5. The upper end face of the valve seat 5 abuts against the valve spring 4. The upper end of the valve spring 4 abuts against the valve spring seat 3. The valve spring seat 3 abuts against the lower end face of the upper connector 1. Since the thrust generated by the main spring 10 and auxiliary spring assembly 13 is much greater than that of the valve spring 4, an annular sealing surface is formed between the upper arc surface 601 of the valve stem 6 and the upper flared end 501 of the lower end face of the valve seat 5. At this time, the lower arc surface 702 of the shuttle rod 7 does not contact the lower flared end 141 of the upper end of the sealing seat 14, so the space between the upper and lower ends of the lower flared end 141 is in a pressure balance state. The torsion sleeve 18 is in a tight fit with the lower end face of the limit connector 17. The rotating shaft 16 is located at the upper end of the spiral groove 171 in the limit connector 17.

[0048] Under pumping pressure, valve seat 5 pushes against valve stem 6, valve stem 6 pushes against shuttle rod 7, and shuttle rod 7 presses against main spring 10 and auxiliary spring 13, all moving downwards simultaneously. When the lower end face of valve seat 5 touches the upper end face 202 of the diverter, valve seat 5 stops moving downwards. At the same time, pressure is applied through the diverter hole 201 on the diverter connector 2, and valve stem 6 and shuttle rod 7 continue to move downwards under pressure, pushing against main spring 10 and auxiliary spring 13. Since the downward bearing area of ​​shuttle rod 7 is greater than the upward bearing area, shuttle rod 7 continues to move downwards after compressing main spring 10 and auxiliary spring 13, until the lower arc surface 702 of shuttle rod 7 contacts and presses against the lower flared end 141 of sealing seat 14, forming a seal. The pressure in the space above the lower flared end 141 is much higher than the pressure in the space below, thus creating a pressure difference. At this time, valve stem 6 stops moving downwards due to being limited by the lower end face 203 of the diverter. Driven by pressure, the shuttle 7, while maintaining a seal with the sealing seat 14, pushes the piston 15, lower connector 20, torsion sleeve 18, and other components downwards. At this time, the main spring 10 and auxiliary spring 13 continue to compress. The rotating shaft 16 drives the torsion sleeve 18, one-way bearing assembly 19, and lower connector 20, moving from the upper end of the spiral groove 171 in the limiting joint 17 to the lower end, while simultaneously rotating radially. When the washer 8 mounted on the shuttle 7 reaches the washer limiting surface 901, the shuttle 7 stops descending. With continued pumping pressure, the sealing seat 14, piston 15, lower connector 20, torsion sleeve 18, and other components continue to descend. At this time, the rotating shaft 16 drives the torsion sleeve 18, one-way bearing assembly 19, and lower connector 20, moving along the spiral groove 171 in the limiting joint 17 to the lower end of the spiral groove 171, completing a predetermined angle and unidirectional rotation. At the same time, the lower flared opening of the sealing seat 14 is pulled apart by a certain distance from the lower arc surface 702 of the shuttle rod 7, and the sealing surface is pulled apart. At this time, the space on both sides of the sealing surface will reach pressure balance in a very short time. Therefore, the main spring 10 and the auxiliary spring 13 will push the shuttle rod 7 upward in a very short time, and bring the valve stem 6 and valve seat 5 upward at the same time, as well as the compression of the valve spring 4. At the same time, since the lower connecting tool of this utility model must always be pressed against the obstacle below, the upper connector 1 will push against the diverter connector 2, the outer cylinder 9, and the limit connector 17 and quickly hit the torsion sleeve 18. The torsion sleeve 18 will transmit the impact force to the lower parts or tools. The rotating shaft 16 will quickly return to the upper end position of the spiral groove 171 in the limit connector 17. Thus, it returns to the initial state of this utility model.

[0049] Advantages of this utility model:

[0050] When connected to a milling tool at the lower end, it can transmit high-frequency axial impact force to the obstructed area and perform rapid milling at the obstructed area. This greatly improves the success rate of unblocking and the efficiency of operation.

[0051] The working process of this utility model is as follows:

[0052] Connect the upper connector 1 and lower connector 20 of this tool to the oil pipe or milling tool respectively. Position the lower milling tool at the obstruction point, and the ground begins pumping pressure. The valve seat 5 will push the valve stem 6 and shuttle 7 downwards a certain distance. Then, the valve seat 5 and valve stem 6 stop descending, while the shuttle 7 continues to descend under pressure. After the shuttle 7 forms a sealed space with the sealing seat 14 and piston 15, it will continue to descend under pressure. When the piston 15 is blocked by the upper end face of the limit connector 17, the lower flared opening of the sealing seat 14 and the lower arc surface 702 of the shuttle 7 are pulled apart by a certain distance, and the sealing surface is opened. At this time, the space on both sides of the sealing surface will reach pressure balance in a very short time. Therefore, the main spring 10 and the auxiliary spring 13 will push the shuttle 7 upwards in a very short time, causing the valve stem 6 and valve seat 5 to move upwards simultaneously, as well as compressing the valve spring 4. Meanwhile, because the lower connecting tool of this invention must always remain pressurized against the obstacle below, the upper connector 1 will quickly impact the torsion sleeve 18 against the diverter connector 2, outer cylinder 9, and limit connector 17. The torsion sleeve 18 will then transmit the impact force to the lower components or tool. The rotating shaft 16 will then quickly return to the upper position of the spiral groove 171 in the limit connector 17. After the tool returns to its initial state, the continuous pumping pressure will repeat the above steps at a high frequency, achieving high-frequency seismic impact and milling operations.

[0053] It will be apparent to those skilled in the art that the above specific examples are merely preferred embodiments of this utility model. Therefore, any improvements or modifications that those skilled in the art may make to certain parts of this utility model still embody the principles of this utility model and achieve its purpose, and all fall within the scope of protection of this utility model.

Claims

1. A rotatable downhole hydraulic hammer device, characterized in that, include: The upper connector (1) is equipped with a diverter connector (2), which is connected in sequence to the outer cylinder (9) and the limiting connector (17). A valve seat mechanism is installed inside the diverter connector (2), which pushes against the valve stem (6). A slidable shuttle rod (7) and a piston (15) are installed inside the outer cylinder (9). The upper end of the shuttle rod (7) is connected to the lower end of the valve stem (6), and the lower end of the shuttle rod is separated from the sealing seat (14) installed on the piston by a certain distance. A torsion sleeve (18) is installed on the limiting connector (17), and a lower connector (20) is installed on the torsion sleeve (18).

2. The rotatable downhole hydraulic hammer device according to claim 1, characterized in that, The valve seat mechanism includes: a valve spring seat (3) fixedly installed in the diverter (2), a valve spring (4) installed on the valve spring seat (3), a valve seat (5) installed on the valve spring (4), a valve stem (6) installed on the valve seat (5), and the valve seat (5) and the valve stem (6) pressing against each other to form an annular sealing surface.

3. The rotatable downhole hydraulic hammer device according to claim 2, characterized in that, The inner wall of the diversion connector (2) is provided with a diversion upper end face (202) for limiting the valve seat (5) and a diversion lower end face (203) for limiting the valve stem (6); the interior of the diversion connector (2) is provided with a diversion hole (201) for transmitting pressure.

4. The rotatable downhole hydraulic hammer device according to claim 2, characterized in that, The valve stem (6) has an upper arc surface (601) at its end. The valve seat (5) has a flared opening (501). The upper arc surface (601) and the flared opening (501) are pressed together.

5. The rotatable downhole hydraulic hammer device according to claim 1 or 2, characterized in that, One end of the shuttle (7) is provided with a limiting platform (703), the middle part of the shuttle (7) is provided with a protrusion (704), a main spring (10) is installed between the limiting platform (703) and the protrusion (704), and a secondary spring (13) is sleeved at the end of the shuttle (7). The inner wall of the outer cylinder (9) is provided with a first, second and third limiting platform for limiting the ends of the limiting platform (703), the protrusion (704) and the secondary spring (13).

6. The rotatable downhole hydraulic hammer device according to claim 5, characterized in that, A main spring seat (11) is installed in the middle of the shuttle (7), the main spring (10) is installed in the main spring seat (11), a secondary spring retaining ring (12) is installed between the secondary spring (13) and the main spring seat (11), and a washer (8) is installed between the main spring (10) and the protrusion (704).

7. The rotatable downhole hydraulic hammer device according to claim 6, characterized in that, The shuttle rod (7) has an axially spaced flow groove (701) on its outer circle to ensure that the pumping pressure can pass through quickly. The end of the shuttle rod (7) is provided with a lower arc surface (702), which can be in sealing contact with the sealing seat (14).

8. The rotatable downhole hydraulic hammer device according to claim 7, characterized in that, A sealing seat (14) is installed at the end of the piston (15), and the end of the shuttle rod (7) contacts the sealing seat (14). A support ring (24), a slip ring (23), and an elastic retaining ring (22) are installed between the piston (15) and the inner wall of the outer cylinder (9). The sealing seat (14) is provided with a lower flared mouth (141) that cooperates with the lower arc surface (702). When the shuttle rod (7) contacts the sealing seat (14), the lower arc surface (702) and the lower flared mouth (141) are pressed together to seal.

9. The rotatable downhole hydraulic hammer device according to claim 1, characterized in that, A rotating shaft (16) is installed on the torsion sleeve (18), and a spiral groove (171) is provided on the limiting joint (17). The extended end of the rotating shaft (16) is engaged in the spiral groove (171). A bushing (26) is provided on the rotating shaft (16), and a spacer ring (27) and a dustproof ring (28) are installed between the limiting joint (17) and the torsion sleeve (18).

10. The rotatable downhole hydraulic hammer device according to claim 1 or 9, characterized in that, The lower connector (20) and the torsion sleeve (18) are fitted with a sliding sleeve (25) at one end and a one-way bearing (19) at the other end.

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