Hydraulically driven downhole percussion device

Abstract

The present application belongs to the technical field of drilling tools, and discloses a hydraulic driving downhole impact device; the impact device comprises an impact device main body, a lower end of the impact device main body is provided with an impact main body, a drilling fluid main channel, a first shunt channel and an inner cavity are arranged in the impact device main body; a flow discharge channel is arranged on the other side of the drilling fluid main channel and the inner cavity, a piston type transmission rod, a transmission mechanism, a first partition structure and a second partition structure are arranged in the inner cavity, and a first pressure boosting port and a second pressure boosting port are arranged between the first partition structure and the second partition structure. The present application realizes the up-and-down lifting of the piston type transmission rod by utilizing the pressure of the drilling fluid, so that the impact main body realizes automatic impact; the downhole impact device designed by adopting the scheme has the advantages of simple structure, low cost, strong practicability, no electronic components, and better adaptability to compact lithology difficult-to-drill strata, and can effectively improve the drilling efficiency.

Description

Technical Field

[0001] This invention belongs to the field of drilling tool technology, and specifically relates to a hydraulically driven downhole impact device. Background Technology

[0002] With the continuous improvement of human society's technological and living standards, people's demand for energy is increasing dramatically. Since the beginning of the 21st century, the problem of energy shortage has become increasingly prominent. Previously, conventional reservoir energy was typically chosen for extraction due to its lower extraction costs. However, with the decreasing reserves of conventional oil and gas resources, the extraction of unconventional resources is becoming increasingly important. Some unconventional reservoirs are deeply buried and have dense lithology, leading to greater drilling difficulty, slower mechanical drilling speeds, frequent stuck pipe accidents, and higher drilling costs. With the large-scale development of unconventional oil and gas resources, the challenge of drilling in hard formations is becoming increasingly prominent. Effective rock breaking is crucial, as the efficiency of rock breaking directly determines the drilling speed and cost, affecting the economic benefits of the entire drilling project. A percussion tool is a reciprocating vibrating power tool that can assist in rock breaking and facilitate unblocking when the drill string is stuck.

[0003] Impactors are essential auxiliary drilling tools used in downhole drilling operations to break rocks. However, most existing impactors have complex structures and high manufacturing costs. Furthermore, the unique operating environment of drilling tools limits their lifespan, resulting in limited practicality. Designing a simple yet highly practical impactor is a crucial issue that the industry urgently needs to address. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a hydraulically driven downhole impact device. The impact device includes an impact device body, with an impact substructure at the lower end of the impact device body. The impact device body contains a drilling fluid main channel, a first diversion channel, and an inner cavity.

[0005] The first diversion channel is located on one side of the main drilling fluid channel and the inner cavity. The other side of the main drilling fluid channel and the inner cavity is provided with a discharge channel. The inner cavity is provided with a piston-type transmission rod, a transmission mechanism, a first partition structure and a second partition structure. The piston-type transmission rod is slidably engaged with the first partition structure and the second partition structure. The impact body is connected to the piston-type transmission rod through the transmission mechanism. A first pressure boosting port and a second pressure boosting port are provided between the first partition structure and the second partition structure.

[0006] Furthermore, the inner cavity is located below the main drilling fluid channel, the first partition structure is located above the second partition structure, the first diversion channel passes through the inner cavity and is connected to the main drilling fluid channel, the first pressurization port is connected to the first diversion channel, and the second pressurization port is connected to the discharge channel.

[0007] Furthermore, a second diversion channel is provided inside the cavity. The second diversion channel is located above the first partition structure and is connected to the main drilling fluid channel.

[0008] Furthermore, the piston-type transmission rod has a top plate extending from one end of the first partition structure, and a rotatably connected baffle is provided on one side of the top plate. One end of the baffle is set in an arc shape, and a first rotating shaft is provided on the baffle. The end of the first rotating shaft is located on the inner wall of the inner cavity, and the first rotating shaft is located in the arc segment of the baffle.

[0009] Furthermore, an intermediate plate is fixedly provided on the piston-type transmission rod, the intermediate plate being located above the first and second pressurization ports, and one end of the piston-type transmission rod extending out of the second partition structure is connected to the transmission mechanism.

[0010] Furthermore, the main body of the impact device is also provided with a discharge port for connecting the discharge channel and the second diversion channel.

[0011] Furthermore, the piston-type transmission rod is also provided with a limiting platform, which is located below the intermediate plate. Both sides of the intermediate plate protrude from the limiting platform. The first partition structure is provided with a piston cavity, and the intermediate plate is placed in the piston cavity and slides in cooperation with the inner wall of the piston cavity.

[0012] Furthermore, the impact body is also provided with a first liquid flow hole and a second liquid flow hole. The first liquid flow hole is provided with a first sliding channel, and the other end of the first sliding channel is sleeved in the first diversion channel. The second liquid flow hole is provided with a second sliding channel, and the other end of the second sliding channel is located in the discharge channel.

[0013] Furthermore, the transmission mechanism includes a rotating rod with a second rotating shaft on it. The end of the second rotating shaft is located on the inner wall of the inner cavity. A piston-type transmission rod has a first sliding rod at one end extending out of the second partition structure. The first sliding rod is sleeved on one end of the rotating rod. The impact body has a transmission rod with a second sliding rod at one end. The second sliding rod is sleeved on the other end of the rotating rod.

[0014] Furthermore, an auxiliary mounting cover is provided on the inner wall of the cavity, and an auxiliary transmission rod is provided on the impact body. The auxiliary transmission rod is placed inside the auxiliary mounting cover and slides in cooperation with the auxiliary mounting cover.

[0015] After the drilling fluid enters the first pressurization port, it squeezes the piston-type transmission rod upward, which in turn drives the impact body downward via a transmission mechanism. Meanwhile, as the drilling fluid in the second diversion channel squeezes downward, it returns the piston-type transmission rod to its original position. At this point, the piston-type transmission rod drives the impact body upward, thus completing one up-and-down impact cycle. Therefore, by utilizing the pressure of the drilling fluid to achieve the up-and-down movement of the piston-type transmission rod, the impact body achieves automatic impact. The downhole impact device designed with this scheme has a simple structure, low cost, strong practicality, and no electronic components. It is more adaptable to dense and difficult-to-drill formations, effectively improving drilling efficiency and reducing the operating cost of the impact device, thereby increasing economic benefits.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of an embodiment of the present invention is shown;

[0019] Figure 2 A cross-sectional structural schematic diagram of an embodiment of the present invention is shown;

[0020] In the diagram, 1 – main body of the impact device; 2 – main channel of drilling fluid; 3 – first diversion channel; 4 – second diversion channel; 5 – baffle; 6 – first rotating shaft; 7 – drain port; 8 – piston-type transmission rod; 9 – drain channel; 10 – first partition structure; 11 – first pressure boosting port; 12 – second pressure boosting port; 13 – second partition structure; 14 – second rotating shaft; 15 – rotating rod; 16 – first sliding rod; 17 – second sliding rod; 18 – transmission rod; 19 – auxiliary mounting cover; 20 – second sliding channel; 21 – first sliding channel; 22 – auxiliary transmission rod; 23 – first fluid flow hole; 24 – second fluid flow hole; 25 – impact body; 26 – inner cavity; 27 – intermediate plate; 28 – top plate; 29 – limiting platform; 30 – piston chamber. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention discloses a hydraulically driven downhole impact device, such as... Figure 1 As shown, the downhole impact device includes an impact device body 1, an impact body 25 at the lower end of the impact device body 1, an impact head of the impact body 25 in the shape of a spherical or conical surface, and multiple conical protrusions fixed on the end face of the impact head. The conical protrusions can greatly improve the impact efficiency of the impact device. An inlet is provided at the upper end of the impact device body 1, and drilling fluid flows into the impact device body 1 from the inlet. The impact body 25 is fixedly connected to the impact device body 1 or detachably connected. The detachable connection facilitates the replacement of the impact body 25.

[0023] In some embodiments of the present invention, the lower end of the impact device body 1 is provided with a PDC drill bit, a roller cone drill bit, or other impact device, and the PDC drill bit, roller cone drill bit, or other impact device is used to replace the impact body 25 for downhole impact operations.

[0024] like Figure 2 As shown, the main body 1 of the impact device is provided with a drilling fluid main channel 2, a first diversion channel 3 and an inner cavity 26. The drilling fluid main channel 2 is located near the inlet at the upper end of the main body 1 and is connected to the inlet. The inner cavity 26 is located directly below the main channel 2. The first diversion channel 3 is located on one side of the drilling fluid main channel 2 and the inner cavity 26. The first diversion channel 3 passes through the inner cavity 26 and is connected to the drilling fluid main channel 2. A discharge channel 9 is provided on the other side of the drilling fluid main channel 2 and the inner cavity 26.

[0025] The inner cavity 26 is provided with a second diversion channel 4, a first partition structure 10 and a second partition structure 13. The first partition structure 10 is located above the second partition structure 13. The first partition structure 10 and the second partition structure 13 divide the internal space of the inner cavity 26 into a first space and a second space. The first space is located above the first partition structure 10 and the second space is located below the second partition structure 13. The second diversion channel 4 is located in the first space and is connected to the drilling fluid main channel 2.

[0026] The inner cavity 26 is also provided with a piston-type transmission rod 8. One end of the piston-type transmission rod 8 passes through the first partition structure 10 and extends into the first space. The piston-type transmission rod 8 is slidably engaged with the first partition structure 10. The other end of the piston-type transmission rod 8 passes through the second partition structure 13 and extends into the second space. The piston-type transmission rod 8 is slidably engaged with the second partition structure 13.

[0027] The piston-type transmission rod 8 has a fixedly connected top plate 28 at one end in the first space. A rotatably connected baffle 5 is provided on one side of the top plate 28. The baffle 5 is J-shaped. The top plate 28 and the baffle 5 are located in the second diversion channel 4. A fixedly connected first rotating shaft 6 is provided on the baffle 5. The first rotating shaft 6 passes through the second diversion channel 4, and the end of the first rotating shaft 6 is placed on the inner wall of the inner cavity 26. The first rotating shaft 6 is rotatably engaged with the inner wall of the inner cavity 26. The first rotating shaft 6 is located in the arc section of the baffle 5.

[0028] In some embodiments of the present invention, the first rotating shaft 6 is fixedly disposed in the second diversion channel 4, and the baffle 5 is provided with a limiting hole. The first rotating shaft 6 passes through the limiting hole and rotates with the baffle 5. The limiting hole is disposed in the arc segment of the baffle 5.

[0029] A first pressurization port 11 is provided between the first partition structure 10 and the second partition structure 13. The first pressurization port 11 is connected to the first diversion channel 3. A middle plate 27 is fixedly provided in the middle section of the piston-type transmission rod 8. The middle plate 27 is located above the first pressurization port 11. A transmission mechanism is provided at one end of the piston-type transmission rod 8 in the second space. The impact body 25 is connected to the other end of the transmission mechanism.

[0030] The main body 1 of the impact device is also provided with a drain port 7, which is located in the first space and is used to connect the drain channel 9 and the second diversion channel 4. When the piston-type transmission rod 8 descends to the top plate 28 and contacts the first partition structure 10, one end of the baffle 5 is in close contact with the inner wall of the main body 1 of the impact device. The top plate 28, the baffle 5 and the inner wall of the main body 1 of the impact device form a closed area, and the drain port 7 is located in the closed area.

[0031] A second pressurization port 12 is provided between the first partition structure 10 and the second partition structure 13. The first pressurization port 11 and the second pressurization port 12 are located on both sides of the piston-type transmission rod 8, respectively. The second pressurization port 12 is connected to the discharge channel 9, and the intermediate plate 27 is located above the second pressurization port 12.

[0032] The piston-type transmission rod 8 is also provided with a fixedly connected limiting platform 29. When the piston-type transmission rod 8 descends to the top plate 28 and contacts the first partition structure 10, the limiting platform 29 abuts against the second partition structure 13. The limiting platform 29 is located below the intermediate plate 27, and both sides of the intermediate plate 27 protrude from the limiting platform 29. The limiting platform 29 can ensure that there is always a certain space between the intermediate plate 27 and the second partition structure 13, so that the drilling fluid can enter the lower side of the intermediate plate 27 through the first pressurization port 11 and the second pressurization port 12, thereby pushing the piston-type transmission rod 8 upward through the intermediate plate 27.

[0033] The impact body 25 is also provided with a first fluid flow hole 23 and a second fluid flow hole 24. The first fluid flow hole 23 is provided with a first sliding channel 21 fixedly connected to it. The other end of the first sliding channel 21 is sleeved in the first diversion channel 3. The drilling fluid in the first diversion channel 3 can flow to the bottom layer through the first sliding channel 21 and the first fluid flow hole 23. The first sliding channel 21, the impact body 25 and the first diversion channel 3 will not interfere with each other, thereby ensuring that the drilling fluid can continuously flow into the bottom layer.

[0034] The second fluid flow orifice 24 is provided with a fixedly connected second sliding channel 20. The other end of the second sliding channel 20 is located in the discharge channel 9. The drilling fluid in the discharge channel 9 can flow to the bottom layer through the second sliding channel 20 and the second fluid flow orifice 24. The second sliding channel 20, the discharge channel 9, and the impact body 25 will not interfere with each other, thereby ensuring that the drilling fluid can continuously flow into the bottom layer. By setting the first fluid flow orifice 23 and the second fluid flow orifice 24, the distribution of drilling fluid is made more uniform.

[0035] During the impact of the impact body 25 on the formation, drilling fluid is continuously ejected from the first fluid flow hole 23 and the second fluid flow hole 24, which can reduce the chance of the impact device getting stuck. In addition, the up-and-down reciprocating impact of the impact device can also release the drill string in time when it gets stuck.

[0036] The first partition structure 10 has a piston chamber 30, and the intermediate plate 27 is placed in the piston chamber 30 and slides with the inner wall of the piston chamber 30. The intermediate plate 27 on the piston transmission rod 8 always slides up and down in the piston chamber 30 to ensure that the drilling fluid does not enter the upper side of the intermediate plate 27, thereby ensuring that the drilling fluid can push the intermediate plate 27 to move.

[0037] When the piston-type transmission rod 8 descends to the top plate 28 and contacts the first partition structure 10, one end of the baffle 5 is in close contact with the inner wall of the impact device body 1, and the top plate 28, the baffle 5 and the inner wall of the impact device body 1 form a closed area; when the piston-type transmission rod 8 ascends, the top plate 28 drives the baffle 5 to rotate, and the closed area is opened; the lower side of one end of the top plate 28 is provided with symmetrically distributed notches, and the notches of the top plate 28 engage with one end of the upper arc segment of the baffle 5, that is, the top plate 28 and the baffle 5 are rotatably connected.

[0038] When the piston-type transmission rod 8 descends to the top plate 28 and contacts the first partition structure 10, the piston-type transmission rod 8, through the cooperation between the top plate 28, the baffle 5, and the first rotating shaft 6, drives the baffle 5 to rotate, causing the other end of the baffle 5 to make close contact with the inner wall of the impact device body 1. When the piston-type transmission rod 8 moves upward, the top plate 28 can drive the baffle 5 to rotate, causing the end of the baffle 5 to move away from the inner wall of the impact device body 1. Drilling fluid enters the area where the top plate 28 is located. Under the pressure of the drilling fluid, the top plate 28 drives the piston-type transmission rod 8 to move downward. When the top plate 28 contacts the first partition structure 10, the top plate 28, the baffle 5, and the inner wall of the impact device body 1 form a closed area again. When the pressure on the upper part of the piston-type transmission rod 8 is less than the pressure on the partition plate 27, the piston-type transmission rod 8 moves upward again.

[0039] The transmission mechanism includes a rotating rod 15, on which a second rotating shaft 14 is fixedly connected. The second rotating shaft 14 is disposed in a second space, and its end is placed on the inner wall of the inner cavity 26 and rotates in cooperation with the inner wall of the inner cavity 26. Both ends of the rotating rod 15 are provided with sliding grooves (not shown in the figure). One end of the piston-type transmission rod 8 located in the second space is provided with a first sliding rod 16. The first sliding rod 16 is sleeved in one of the sliding grooves of the rotating rod 15. The impact body 25 is provided with a transmission rod 18, and one end of the transmission rod 18 is provided with a second sliding rod 17. The second sliding rod 17 is sleeved in the other sliding groove.

[0040] When the piston-type transmission rod 8 moves up and down, the first slide rod 16 slides in the groove on the rotating rod 15, thereby driving the rotating rod 15 to rotate. When the rotating rod 15 rotates, the second slide rod 17 slides in another groove on the rotating rod 15, thereby driving the impact body 25 to move up and down, realizing reciprocating impact.

[0041] An auxiliary mounting cover 19 is fixedly connected to the inner wall of the inner cavity 26, and an auxiliary transmission rod 22 is fixedly connected to the impact body 25. The auxiliary transmission rod 22 is placed inside the auxiliary mounting cover 19 and slides in cooperation with the auxiliary mounting cover 19. The auxiliary mounting cover 19 and the auxiliary transmission rod 22 can ensure that the impact body 25 always moves linearly relative to the impact device body 1, ensuring the smoothness of the impact body 25's movement, effectively extending the service life of the impact body 25 and the drill bit's first transmission rod 18, making the invention more durable.

[0042] In some embodiments of the present invention, the second rotating shaft 14 is disposed in the second space, the end of the second rotating shaft 14 is placed on the inner wall of the inner cavity 26 and is fixedly connected or rotatably connected to the inner wall of the inner cavity 26, the rotating rod 15 is provided with a limiting hole, the second rotating shaft 14 is placed in the limiting hole and rotatably cooperates with the limiting hole.

[0043] In some embodiments of the present invention, the upper end of the transmission rod 18 is provided with a mounting hole through which the transmission rod 18 is penetrated. The second slide rod 17 is configured as a bolt or stud with a nut. The bolt or stud is used to pass through the mounting hole on the transmission rod 18 and the slide groove on the rotating rod 15 in sequence and is tightened with a nut to connect the transmission rod 18 and the rotating rod 15, so as to ensure that the impact body 25 is detachable and easy to replace the impact body 25.

[0044] When the piston-type transmission rod 8 descends to the top plate 28 and contacts the first partition structure 10, one end of the baffle 5 is in close contact with the inner wall of the impact device body 1. The top plate 28, the baffle 5, and the inner wall of the impact device body 1 form a closed area. After the drilling fluid enters from the main drilling fluid channel 2, the drilling fluid in the second diversion channel 4 will be blocked by the drilling fluid baffle 5 at this time and cannot flow downward. Then the drilling fluid will quickly flow downward from the first diversion channel 3. At this time, the drilling fluid in the closed area formed by the top plate 28 and the baffle 5 flows out through the discharge channel 9, and there is no longer any drilling fluid pressure on the top plate 28.

[0045] When drilling fluid enters the first pressurization port 11, the intermediate plate 27 of the piston-type transmission rod 8 is subjected to upward pressure, while there is no drilling fluid pressure on the top plate 28. The drilling fluid in the first pressurization port 11 then forces the piston-type transmission rod 8 upward. Due to the cooperation between the drilling fluid baffle 5, the first rotating shaft 6, and the second diversion channel 4, the baffle 5 easily rotates under the pushing action of the piston-type transmission rod 8. As the piston-type transmission rod 8 moves upward, it drives the impact body 25 downward through the transmission mechanism.

[0046] When the piston-type transmission rod 8 moves upward, it drives the fluid baffle 5 to rotate, opening up the closed area formed by the top plate 28, the baffle 5, and the inner wall of the impact device body 1. Drilling fluid then enters the area between the baffle 5 and the piston-type transmission rod 8. At this time, the piston-type transmission rod 8, the top plate 28, and the inner wall of the inner cavity 26 form a closed area, and the drain port 7 is located within this closed area. Therefore, the drilling fluid above the top plate 28 cannot flow out from the drain port 7. When the downward pressure on the top plate 28 is greater than the upward pressure on the intermediate plate 27, the piston-type transmission rod 8 will move downward and drive the impact body 25 upward through the transmission mechanism.

[0047] As the piston rod 8 descends, the drilling fluid located between the baffle 5 and the piston rod 8 flows downward from the drain port 7. A portion of the drilling fluid enters the second pressurization port 12, where it combines with the drilling fluid in the first pressurization port 11 to make the next upward impact on the piston rod 8, while the other portion of the drilling fluid flows out from the drilling fluid drain channel 9.

[0048] This invention utilizes the pressure of drilling fluid to achieve the up-and-down movement of the piston-type transmission rod 8, thereby enabling the impact body 25 to automatically impact. It has a simple structure, low cost, strong practicality, no electronic components, and is more adaptable to dense and difficult-to-drill formations, which can effectively improve drilling efficiency and increase economic benefits.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulically driven downhole impact device, characterized in that, The impact device includes an impact device body (1), and an impact body (25) is provided at the lower end of the impact device body (1). The impact device body (1) is provided with a drilling fluid main channel (2), a first diversion channel (3) and an inner cavity (26). The first diversion channel (3) is located on one side of the main drilling fluid channel (2) and the inner cavity (26). The other side of the main drilling fluid channel (2) and the inner cavity (26) is provided with a discharge channel (9). The inner cavity (26) is provided with a piston-type transmission rod (8), a transmission mechanism, a first partition structure (10) and a second partition structure (13). The piston-type transmission rod (8) is slidably engaged with the first partition structure (10) and the second partition structure (13). The impact body (25) is connected to the piston-type transmission rod (8) through the transmission mechanism. A first pressure-boosting port (11) and a second pressure-boosting port (12) are provided between the first partition structure (10) and the second partition structure (13). The inner cavity (26) is located below the main drilling fluid channel (2), the first partition structure (10) is located above the second partition structure (13), the first diversion channel (3) passes through the inner cavity (26) and is connected to the main drilling fluid channel (2), the first pressurization port (11) is connected to the first diversion channel (3), and the second pressurization port (12) is connected to the discharge channel (9). The inner cavity (26) is also provided with a second diversion channel (4), which is located above the first partition structure (10) and is connected to the main drilling fluid channel (2); The piston-type transmission rod (8) has a top plate (28) extending out of the first partition structure (10). A rotatably connected baffle (5) is provided on one side of the top plate (28). One end of the baffle (5) is set in an arc shape. A first rotating shaft (6) is provided on the baffle (5). The end of the first rotating shaft (6) is located on the inner wall of the inner cavity (26). The first rotating shaft (6) is located in the arc section of the baffle (5). An intermediate plate (27) is fixedly provided on the piston-type transmission rod (8). The intermediate plate (27) is located above the first pressure port (11) and the second pressure port (12). One end of the piston-type transmission rod (8) extending out of the second partition structure (13) is connected to the transmission mechanism.

2. The hydraulically driven downhole impact device according to claim 1, characterized in that, The main body (1) of the impact device is also provided with a discharge port (7) for connecting the discharge channel (9) and the second diversion channel (4).

3. The hydraulically driven downhole impact device according to claim 1, characterized in that, The piston-type transmission rod (8) is also provided with a limiting platform (29), which is located below the intermediate plate (27). Both sides of the intermediate plate (27) protrude from the limiting platform (29). The first partition structure (10) is provided with a piston cavity (30), and the intermediate plate (27) is placed in the piston cavity (30) and slides with the inner wall of the piston cavity (30).

4. The hydraulically driven downhole impact device according to claim 1, characterized in that, The impact body (25) is also provided with a first liquid flow hole (23) and a second liquid flow hole (24). The first liquid flow hole (23) is provided with a first sliding channel (21), and the other end of the first sliding channel (21) is sleeved in the first diversion channel (3). The second liquid flow hole (24) is provided with a second sliding channel (20), and the other end of the second sliding channel (20) is provided in the discharge channel (9).

5. A hydraulically driven downhole impact device according to claim 1, characterized in that, The transmission mechanism includes a rotating rod (15), a second rotating shaft (14) on the rotating rod (15), the end of the second rotating shaft (14) being located on the inner wall of the inner cavity (26), a piston-type transmission rod (8) extending out of the second partition structure (13) having a first sliding rod (16) at one end, the first sliding rod (16) being sleeved on one end of the rotating rod (15), a transmission rod (18) on the impact body (25), a second sliding rod (17) at one end of the transmission rod (18), the second sliding rod (17) being sleeved on the other end of the rotating rod (15).

6. A hydraulically driven downhole impact device according to any one of claims 1-5, characterized in that, An auxiliary mounting cover (19) is provided on the inner wall of the inner cavity (26), and an auxiliary transmission rod (22) is provided on the impact body (25). The auxiliary transmission rod (22) is placed inside the auxiliary mounting cover (19) and slides in cooperation with the auxiliary mounting cover (19).

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