Deep-buried composite fractured stratum long-distance horizontal drilling device and operation method thereof

Abstract

The invention discloses a deep-buried composite fractured stratum long-distance horizontal drilling device and an operation method thereof, and relates to the technical field of horizontal drilling. The drilling rod assembly is used for horizontal drilling, and the drilling power part is used for driving rotation and axial movement of the drilling rod assembly. The drill rod assembly is formed by connecting a plurality of drill rods end to end, the drill rod located at the head is connected with a drill bit through a connecting piece, and the drill rod located at the tail is driven by rotation and axial movement of a drilling power part. The blocking ribs are arranged in the drill rod and divide the drill rod into the backflow cavity, the jet flow cavity and the second V-shaped supporting frame, on one hand, the problems of water source jet flow and slurry backflow are solved, on the other hand, due to the fact that the through holes are formed in the side wall of the drill rod, a gap between the drill rod and the well wall can be filled with a water source after jet flow due to water pressure, and a lubricating layer is formed; therefore, damping generated by contact friction between the drill rod and the well wall is prevented.

Description

Technical Field

[0001] This invention relates to the field of horizontal drilling technology, and in particular to a long-distance horizontal drilling device and its operation method for deeply buried composite fractured strata. Background Technology

[0002] Trenchless technology, especially horizontal directional drilling, has become the preferred construction method for crossing obstacles such as highways, railways, rivers, buildings, and historical preservation areas due to its significant advantages, including minimal impact on ground traffic, the environment, and buildings, and high construction efficiency. Its applications are wide-ranging, including: pipeline laying (for laying pressure pipelines for oil, natural gas, water supply, and drainage, as well as conduits for power, communication, and fiber optic cables); coal mine gas extraction; grouting modification of aquifers in the top and bottom of coal seams; and sealing of mine inrush water. It is also used for pre-grouting reinforcement of fractured surrounding rock in deep-buried tunnels.

[0003] In existing technologies, the drill rod of horizontal directional drilling is a hollow drill rod. During the directional drilling process, the drill bit has water jet holes to spray high-pressure water to dissolve the mud and increase drilling efficiency. At the same time, the dissolved mud water flows back along the end of the drill bit and is transported to the mud settling tank for sedimentation. The settled water is then transported back into the well to achieve water circulation.

[0004] The existing technology has the following drawbacks: during drilling, the drill pipe sidewall is in constant contact with the well wall, and this contact generates friction. This friction hinders the rotation and deepening of the drill pipe, resulting in low drilling efficiency and high load. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a long-distance horizontal drilling device and its operation method for deeply buried composite fractured strata.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A long-distance horizontal drilling device for deep-buried composite fractured strata includes a drill rod assembly for horizontal drilling and a drilling power unit for driving the rotation and axial movement of the drill rod assembly. The drill rod assembly consists of multiple drill rods connected end to end. The drill rod at the head end is connected to the drill bit via a connector, and the drill rod at the tail end is driven by the rotation and axial movement of the drilling power unit. The drill rod is provided with a baffle rib inside, and the inner cavity of the drill rod is divided by the baffle rib into a return cavity for mud water return and a jet cavity for water jet by means of the baffle rib. At the same time, the outer wall of the drill rod is provided with a through hole that communicates with the return cavity. The drill bit includes multiple breaking teeth disposed on one side of the connector and multiple spray holes opened in the connector and communicating with the jet cavity, and the connector blocks the return cavity of the head drill rod.

[0007] Preferably, one end of the drill rod is provided with an external threaded boss, and the other end of the drill rod is provided with an internal threaded cylinder that mates with the external threaded boss. The two ends of the barrier rib are respectively provided with a stepped protrusion and a stepped groove that mate with each other. The stepped protrusion and the stepped groove are sealed by the stepped sealing surface.

[0008] Furthermore, the drilling power unit includes a base, a fixing member disposed at the front end of the base, a rotating member disposed above the base, and a support member disposed above the base and located between the rotating member and the fixing member.

[0009] Based on the aforementioned solution: the top outer wall of the base is fixed with a guide rail by bolts, the outer wall of the guide rail is slidably connected with a slide table, and the top of the base is provided with a linear drive component for sliding the slide table.

[0010] A preferred embodiment of the aforementioned scheme is as follows: the rotating component includes a threaded rotary table rotatably connected to the inner wall of the slide and having one side engaged with the internal threaded cylinder of the drill rod, and a fixed frame rotatably connected to the other end of the threaded rotary table. The inner walls of both the fixed frame and the threaded rotary table are provided with a connecting cavity one communicating with the return cavity and a connecting cavity two communicating with the jet cavity, respectively. The side wall of the fixed frame is provided with a return hole communicating with the connecting cavity one and a jet hole communicating with the connecting cavity two, respectively. The other end of the return hole is connected to the mud sedimentation tank, and the other end of the jet hole is connected to a water source through a jet pump.

[0011] As a further embodiment of the present invention: a toothed ring is fixed to the outer wall of the threaded rotary table, a rotary drive is fixedly embedded in the inner wall of the slide, and a gear meshing with the outer wall of the toothed ring is fixed to the rotary output end of the rotary drive.

[0012] Meanwhile, the fixing component includes a fixing ring fixed to the inner wall of the base and two sliding rings slidably connected to the outer wall of the fixing ring. One side of the sliding ring is rotatably connected to a plurality of circular array of connecting rods, and the other end of the connecting rod is rotatably connected to a gripper. The gripper is radially slidably connected to the side wall of the fixing ring.

[0013] As a preferred embodiment of the present invention: a bidirectional telescopic rod is fixedly embedded in the inner wall of the base, and the two telescopic ends of the bidirectional telescopic rod are respectively fixed to the side walls of the two sliding rings.

[0014] Meanwhile, the support includes a first “V”-shaped support frame and a second “V”-shaped support frame. The first “V”-shaped support frame is fixed to the top outer wall of the base, and the second “V”-shaped support frame is fixed to the top outer wall of the slide.

[0015] An operation method for a long-distance horizontal drilling device for deeply buried composite fractured strata includes the following steps: S1: Connect the drill rod to the threaded rotary table, and drive the drill rod to rotate and move linearly through the linear drive and rotary drive to perform horizontal drilling. At the same time as horizontal drilling, start the jet pump to perform jetting. S2: After drilling to the deepest position with a single drill rod, separate the drill rod from the thread rotary table, then add a new drill rod and connect it, and then continue to execute S1 until the maximum drilling depth is reached.

[0016] The beneficial effects of this invention are as follows: 1. The present invention, by setting a barrier rib inside the drill pipe, divides the drill pipe into a return chamber, a jet chamber and a "V"-shaped support frame. On the one hand, it solves the problems of water jetting and mud return. On the other hand, since the through hole is on the side wall of the drill pipe, the water after jetting will fill the gap between the drill pipe and the well wall due to water pressure, forming a lubricating layer, thereby preventing the damping caused by the contact friction between the drill pipe and the well wall.

[0017] 2. This invention, by setting an external threaded boss and an internal threaded cylinder, enables the rapid connection of the drill rod. The connection and disassembly of the drill rod can be achieved by rotating the thread and driving the rotation of the drilling power unit, increasing convenience. At the same time, by setting a trapezoidal protrusion and a trapezoidal groove, the trapezoidal sealing surface is used to seal, thereby ensuring that the return cavity and the jet cavity are not connected to each other, and the sealing action can be synchronized with the connection action of the drill rod, further increasing convenience.

[0018] 3. The present invention, through the threaded connection between drill rods and the threaded connection between drill rods and the threaded rotary table, enables the connection to be achieved simply by using a hoisting device when increasing the number of drill rods, thereby increasing drilling efficiency.

[0019] 4. The present invention, by setting up support and fixing components, can clamp and support the drill rod for fixed positioning, thereby achieving higher precision in the threaded connection between drill rods and between the drill rod and the threaded rotary table, and increasing the connection efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention. Figure 2 This is a schematic diagram of the drill rod assembly structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the drill rod and drill rod assembly of a long-distance horizontal drilling device for deep-buried composite fractured strata proposed in this invention; Figure 4 This is a schematic diagram of the drill bit structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention; Figure 5This is a schematic diagram of the drilling power unit structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention; Figure 6 This is a cross-sectional structural diagram of the rotating component of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention. Figure 7 This is a schematic diagram of the rotating drive component structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention. Figure 8 This is a schematic diagram of the fixing component structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention; Figure 9 This is a schematic diagram of the bidirectional telescopic rod position structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention; Figure 10 This is a schematic diagram of the support structure of a long-distance horizontal drilling device for deeply buried composite fractured strata proposed in this invention.

[0021] In the diagram: 1. Drilling power unit; 2. Drill rod assembly; 3. Drill rod; 4. Through hole; 5. Connector; 6. Drill bit; 7. Return chamber; 8. Jet chamber; 9. "V" type support frame II; 10. Barrier rib; 11. External thread boss; 12. Internal thread cylinder; 13. Trapezoidal sealing surface; 14. Breaking tooth; 15. Spray hole; 16. Base; 17. Slide table; 18. Rotating component; 19. Support component; 20. Fixing component; 21. Guide rail; 22. Connecting cavity I; 23. Connecting cavity II; 24. Jet hole; 25. Return hole; 26. Fixing frame; 27. Threaded rotary table; 28. Gear ring; 29. ​​Gear; 30. Rotary drive component; 31. Fixing ring; 32. Clamp; 33. Connecting rod; 34. Sliding ring; 35. Bidirectional telescopic rod; 36. "V" type support frame I. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] Example 1: A long-distance horizontal drilling device for deeply buried composite fractured strata, such as Figures 1-10 As shown, it includes a drill rod assembly 2 for horizontal drilling and a drilling power unit 1 for driving the rotation and axial movement of the drill rod assembly 2.

[0025] The drill rod assembly 2 is composed of multiple drill rods 3 connected end to end. The drill rod 3 at the head end is connected to the drill bit 6 through the connector 5, and the drill rod 3 at the tail end is driven by the rotation and axial movement of the drilling power unit 1.

[0026] The drill rod 3 is provided with a barrier rib 10 inside, and the inner cavity of the drill rod 3 is divided by the barrier rib 10 into a return cavity 7 for mud water return and a jet cavity 8 for water source jet by means of the barrier rib 10. At the same time, the outer wall of the drill rod 3 is provided with a through hole 4 that communicates with the return cavity 7.

[0027] One end of the drill rod 3 is provided with an external threaded boss 11, and the other end of the drill rod 3 is provided with an internal threaded cylinder 12 that mates with the external threaded boss 11. The two ends of the barrier rib 10 are respectively provided with a stepped protrusion and a stepped groove that mate with each other. The stepped protrusion and the stepped groove are sealed by the stepped sealing surface 13.

[0028] The drill bit 6 includes multiple breaking teeth 14 disposed on one side of the connector 5 and multiple spray holes 15 opened in the connector 5 and communicating with the jet cavity 8, and the connector 5 blocks the return cavity 7 of the head drill rod 3.

[0029] When in use, water can be injected into the jet chamber 8 by the jet pump. The water is then jetted at high speed through the nozzle 15 to the front of the breaking tooth 14 for percussion drilling. At the same time, the breaking tooth 14 rotates to drill. The mud water after jetting will fill the gaps in the well wall and drill rod 3, and then flow into the return chamber 7 through the through hole 4, and then into the mud sedimentation tank.

[0030] This device, by setting a barrier rib 10 inside the drill rod 3, divides the drill rod 3 into a return chamber 7, a jet chamber 8, and a "V"-shaped support frame 9. On the one hand, it solves the problems of water jetting and mud return. On the other hand, because the through hole 4 is on the side wall of the drill rod 3, the water after jetting will fill the gap between the drill rod 3 and the well wall due to water pressure, forming a lubricating layer, thereby preventing the damping caused by the contact friction between the drill rod 3 and the well wall.

[0031] In addition, by setting an external threaded boss 11 and an internal threaded cylinder 12, this device can achieve quick connection of the drill rod 3. The connection and disassembly of the drill rod 3 can be achieved by rotating the thread and driving the rotation of the drilling power unit 1, which increases convenience. At the same time, by setting a stepped protrusion and a stepped groove, it can use the stepped sealing surface 13 to seal, thereby ensuring that the return cavity 7 and the jet cavity 8 are not connected to each other, and the sealing action can be synchronized with the connection action of the drill rod 3, which further increases convenience.

[0032] To solve the drive problem of drill pipe assembly 2; such as Figures 5-10As shown, the drilling power unit 1 includes a base 16, a fixing member 20 disposed at the front end of the base 16, a rotating member 18 disposed above the base 16, and a support member 19 disposed above the base 16 and located between the rotating member 18 and the fixing member 20.

[0033] The top outer wall of the base 16 is fixed with a guide rail 21 by bolts. The outer wall of the guide rail 21 is slidably connected with a slide table 17. The top of the base 16 is provided with a linear drive component for sliding the slide table 17. The linear drive component can be a hydraulic telescopic rod or a screw slider mechanism. Since the force exerted on the drill rod assembly 2 in the front push and back pull is large, the linear drive component is preferably a hydraulic telescopic rod in this embodiment.

[0034] The rotating component 18 includes a threaded rotary table 27 rotatably connected to the inner wall of the slide table 17 and having one side engaged with the internal threaded cylinder 12 of the drill rod 3, and a fixed frame 26 rotatably connected to the other end of the threaded rotary table 27. The inner walls of the fixed frame 26 and the threaded rotary table 27 are respectively provided with a connecting cavity 1 22 communicating with the return cavity 7 and a connecting cavity 23 communicating with the jet cavity 8. The side wall of the fixed frame 26 is respectively provided with a return hole 25 communicating with the connecting cavity 1 22 and a jet hole 24 communicating with the connecting cavity 23. The other end of the return hole 25 is connected to the mud sedimentation tank, and the other end of the jet hole 24 is connected to a water source through a jet pump.

[0035] The outer wall of the threaded rotary table 27 is fixed with a gear ring 28, and the inner wall of the slide table 17 is fixedly embedded with a rotary drive component 30. The rotary output end of the rotary drive component 30 is fixed with a gear 29 that meshes with the outer wall of the gear ring 28.

[0036] The fixing member 20 includes a fixing ring 31 fixed to the inner wall of the base 16 and two sliding rings 34 slidably connected to the outer wall of the fixing ring 31. One side of the sliding ring 34 is rotatably connected to a plurality of circular array of connecting rods 33, and the other end of the connecting rod 33 is rotatably connected to a gripper 32. The gripper 32 is radially slidably connected to the side wall of the fixing ring 31. A bidirectional telescopic rod 35 is fixedly embedded in the inner wall of the base 16, and the two telescopic ends of the bidirectional telescopic rod 35 are respectively fixed to the side walls of the two sliding rings 34.

[0037] The support member 19 includes a first “V”-shaped support frame 36 and a second “V”-shaped support frame 9. The first “V”-shaped support frame 36 is fixed to the top outer wall of the base 16, and the second “V”-shaped support frame 9 is fixed to the top outer wall of the slide table 17.

[0038] In use, the linear drive unit moves the slide table 17 to the far right. Then, a first drill rod 3, with a drill bit 6 mounted on its head, is hoisted through the inner wall of the fixing ring 31 and supported by two "V"-shaped support frames 36. The bidirectional telescopic rod 35 extends, moving the two sliding rings 34, which in turn causes the clamping jaws 32 to retract via the connecting rod 33, clamping and fixing the drill rod 3. The rotary drive unit 30 then activates, driving the threaded rotary table 27 to rotate via the gear 29. Simultaneously, the linear drive unit moves the slide table 17 to the left, causing one end of the threaded rotary table 27 to engage with the internal threaded cylinder 12 of the drill rod 3. After engagement, the bidirectional telescopic rod 35 retracts, and the clamping jaws 32 loosen their grip on the drill rod 3. The threaded rotary table 27 then rotates the drill rod 3, and the linear drive unit moves the drill rod 3 axially for horizontal drilling. Simultaneously, a jet pump delivers water to the drill rod. At the jet hole 24, the mud is then transported to the jet chamber 8 of the drill rod 3 through the connecting chamber 23. The returned mud is transported to the connecting chamber 22 through the return chamber 7, and then returned to the mud sedimentation tank through the return hole 25. After the single drill rod 3 has drilled to its maximum length, the bidirectional telescopic rod 35 extends again to clamp and fix the end of the drill rod 3. Then the rotary drive 30 rotates in the opposite direction to separate the threaded rotary table 27 from the drill rod 3. Then the linear drive drives the slide table 17 to move to the far right. Then, another drill rod 3 is placed between the drill rod 3 and the threaded rotary table 27 by hoisting, and one end is supported by the "V"-shaped support frame 29. Then the rotary drive 30 and the linear drive start to connect the second drill rod 3 to the threaded rotary table 27. After the connection is complete, the threaded rotary table 27 continues to rotate to connect the two drill rods 3. Then, horizontal drilling continues until the desired position is reached.

[0039] This device, through the threaded connection between drill rods 3 and between drill rods 3 and threaded connection between drill rods 3 and threaded rotary table 27, can achieve the connection by simply using a hoisting device when increasing the number of drill rods 3, thereby increasing drilling efficiency.

[0040] In addition, by setting up support member 19 and fixing member 20, this device can clamp and support the drill rod 3 for fixed positioning, thereby improving the thread connection accuracy of drill rod 3 to drill rod 3 and the thread connection accuracy of drill rod 3 to thread rotary table 27, and increasing the connection efficiency.

[0041] In this embodiment, during use, the linear drive unit can be used to move the slide table 17 to the far right. Then, a first drill rod 3 with a drill bit 6 mounted on its head is hoisted through the inner wall of the fixing ring 31 and supported by two "V"-shaped support frames 36. Subsequently, the bidirectional telescopic rod 35 extends, which drives the two sliding rings 34 to move, thereby causing the clamping jaws 32 to retract via the connecting rod 33 to clamp and fix the drill rod 3. Then, the rotary drive unit 30 is activated, which drives the threaded rotary table 27 to rotate via the gear 29. Simultaneously, the linear drive moves the slide 17 to the left, causing one end of the threaded rotary table 27 to engage with the internal threaded cylinder 12 of the drill rod 3. After engagement, the bidirectional telescopic rod 35 retracts, and the jaws 32 loosen their grip on the drill rod 3. Subsequently, the threaded rotary table 27 drives the drill rod 3 to rotate, and the linear drive moves the drill rod 3 axially to perform horizontal drilling. At the same time, the jet pump delivers water to the jet hole 24, and then through the connecting cavity 23 to the jet cavity 8 of the drill rod 3. The water then flows through the spray hole 15 to the high-pressure jet. The jet of mud is directed to the front of the breaking tooth 14 for impact drilling, while the breaking tooth 14 rotates to drill. The mud after jetting fills the well wall and the gaps in the drill pipe 3, and then flows into the return chamber 7 through the through hole 4. The returned mud is transported to the connecting chamber 22 through the return chamber 7, and then flows back to the mud sedimentation tank through the return hole 25. After the single drill pipe 3 has been drilled to its maximum length, the bidirectional telescopic rod 35 extends again to clamp and fix the end of the drill pipe 3. Then the rotating drive 30 rotates in the opposite direction to turn the threaded screw... The rotary table 27 separates from the drill rod 3. Then, the linear drive drives the slide table 17 to move to the far right. Next, another drill rod 3 is placed between the drill rod 3 and the thread rotary table 27 by hoisting, and one end is supported by the "V"-shaped support frame 29. Then, the rotary drive 30 and the linear drive are activated to connect the drill rod 3 placed later with the thread rotary table 27. After the connection is complete, the thread rotary table 27 continues to rotate to connect the two drill rods 3. Then, horizontal drilling continues until the desired position is reached.

[0042] Example 2: An operation method for a long-distance horizontal drilling device for deeply buried composite fractured strata, comprising the following steps: S1: Connect the drill rod 3 to the threaded rotary table 27, and drive the drill rod 3 to rotate and move linearly through the linear drive and rotary drive 30 to perform horizontal drilling. At the same time as horizontal drilling, start the jet pump to perform jetting. S2: After drilling a single drill rod 3 to the deepest position, the drill rod 3 is separated from the threaded rotary table 27, then a new drill rod 3 is added and connected, and then S1 is continued until the maximum drilling depth is reached.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A long-distance horizontal drilling device for deep-buried composite fractured strata, comprising a drill rod assembly (2) for horizontal drilling and a drilling power unit (1) for driving the rotation and axial movement of the drill rod assembly (2), characterized in that, The drill rod assembly (2) is composed of multiple drill rods (3) connected end to end. The drill rod (3) at the head end is connected to a drill bit (6) through a connector (5), and the drill rod (3) at the tail end is driven by the drilling power unit (1) to rotate and move axially. The drill rod (3) is provided with a barrier rib (10) inside, and the inner cavity of the drill rod (3) is divided by the barrier rib (10) into a return cavity (7) for mud water return and a jet cavity (8) for water jet by means of the barrier rib (10). At the same time, the outer wall of the drill rod (3) is provided with a through hole (4) that communicates with the return cavity (7). The drill bit (6) includes multiple breaking teeth (14) disposed on one side of the connector (5) and multiple nozzles (15) opened on the connector (5) and communicating with the jet cavity (8), and the connector (5) blocks the return cavity (7) of the head drill rod (3).

2. The long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 1, characterized in that, One end of the drill rod (3) is provided with an external threaded boss (11), and the other end of the drill rod (3) is provided with an internal threaded cylinder (12) that mates with the external threaded boss (11). The two ends of the barrier rib (10) are respectively provided with a stepped protrusion and a stepped groove that mate with each other. The stepped protrusion and the stepped groove are sealed by the stepped sealing surface (13).

3. The long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 1, characterized in that, The drilling power unit (1) includes a base (16), a fixing member (20) disposed at the front end of the base (16), a rotating member (18) disposed above the base (16), and a support member (19) disposed above the base (16) and located between the rotating member (18) and the fixing member (20).

4. The long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 3, characterized in that, The top outer wall of the base (16) is fixed with a guide rail (21) by bolts. The outer wall of the guide rail (21) is slidably connected with a slide table (17), and the top of the base (16) is provided with a linear drive for sliding the slide table (17).

5. The long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 3, characterized in that, The rotating component (18) includes a threaded rotary table (27) rotatably connected to the inner wall of the slide (17) and one side of which is engaged with the internal threaded cylinder (12) of the drill rod (3), and a fixed frame (26) rotatably connected to the other end of the threaded rotary table (27). The inner walls of the fixed frame (26) and the threaded rotary table (27) are respectively provided with a connecting cavity one (22) communicating with the return cavity (7) and a connecting cavity two (23) communicating with the jet cavity (8). The side wall of the fixed frame (26) is respectively provided with a return hole (25) communicating with the connecting cavity one (22) and a jet hole (24) communicating with the connecting cavity two (23). The other end of the return hole (25) is connected to the mud sedimentation tank, and the other end of the jet hole (24) is connected to the water source through a jet pump.

6. The long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 5, characterized in that, The outer wall of the threaded rotary table (27) is fixed with a toothed ring (28), and the inner wall of the slide table (17) is fixedly fitted with a rotary drive (30). The rotary output end of the rotary drive (30) is fixed with a gear (29) meshing with the outer wall of the toothed ring (28).

7. The long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 3, characterized in that, The fastener (20) includes a fixing ring (31) fixed to the inner wall of the base (16) and two sliding rings (34) slidably connected to the outer wall of the fixing ring (31). One side of the sliding ring (34) is rotatably connected to a plurality of circular array of connecting rods (33), and the other end of the connecting rod (33) is rotatably connected to a gripper (32). The gripper (32) is radially slidably connected to the side wall of the fixing ring (31).

8. The long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 7, characterized in that, The inner wall of the base (16) is fixedly fitted with a bidirectional telescopic rod (35), and the two telescopic ends of the bidirectional telescopic rod (35) are respectively fixed to the side walls of two sliding rings (34).

9. A long-distance horizontal drilling device for deep-buried composite fractured strata according to claim 3, characterized in that, The support member (19) includes a first "V"-shaped support frame (36) and a second "V"-shaped support frame (9). The first "V"-shaped support frame (36) is fixed to the top outer wall of the base (16), and the second "V"-shaped support frame (9) is fixed to the top outer wall of the slide (17).

10. An operation method for a long-distance horizontal drilling device for deeply buried composite fractured strata, characterized in that, Includes the following steps: S1: Connect the drill rod (3) to the threaded rotary table (27), and drive the drill rod (3) to rotate and move linearly through the linear drive and rotary drive (30) to perform horizontal drilling. At the same time, start the jet pump to perform jetting. S2: After a single drill rod (3) drills to the deepest position, the drill rod (3) is separated from the thread rotary table (27), and then a new drill rod (3) is added and connected. Then S1 is continued until the maximum drilling depth is reached.

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