A drill string structure for core sampling

Abstract

This application discloses a drilling tool structure for core sampling, comprising a piling assembly, a sampling assembly, and a retrieval assembly. The piling assembly includes an outer tube, a stop, and a drill bit. The drill bit is connected to one end of the outer tube, and the stop is connected to the other end. The sampling assembly is disposed within the outer tube and includes a drill bit, an inner tube, and a sampling cylinder. The sampling cylinder is connected to one end of the inner tube, and the drill bit is connected to the other end of the inner tube. The sampling cylinder is disposed within the drill bit, and the sampling cylinder is connected to the bottom opening of the drill bit. A connector is provided at the end of the drill bit away from the inner tube, and the connector includes a connecting post and a clamping block. The retrieval assembly includes a retrieval rod and a rotating clamping rod. Two rotating clamping rods are rotatably connected to one end of the retrieval rod, and a clamping block is connected to one side of the rotating clamping rod. The clamping block is clamped between the two clamping blocks. This application has the effect of achieving stable sampling of relatively thick rock strata.

Description

Technical Field

[0001] This application relates to the technical field of geological drilling, and in particular to a drill string structure for core sampling. Background Technology

[0002] In the process of geological exploration, it is necessary to take core samples to determine the geological conditions. Core sampling plays an important role in oil and gas exploration and geological exploration.

[0003] Currently, Chinese patent CN211927329U discloses a core sampling device, including a drill rod, a core tube, a hoisting mechanism, and a mechanical impact mechanism. The drill rod is inserted into the rock stratum, and the core tube is located inside the drill rod with its bottom at the top of the rock stratum to be sampled. The mechanical impact mechanism is connected to the hoisting mechanism and can be vertically moved and hung above the core tube via the hoisting mechanism.

[0004] Regarding the aforementioned technologies, the inventors believe that the core sampling device relies solely on the free fall of the mechanical impact device to strike the core tube into the rock layer for sampling. This is inconvenient when sampling hard rock layers, and the core tube is relatively short, making it unsuitable for longitudinal sampling and analysis of deeper and longer rock layers, thus failing to meet sampling requirements. Utility Model Content

[0005] To achieve stable sampling of thick rock layers, this application provides a drill bit structure for core sampling.

[0006] The drilling tool structure for core sampling provided in this application adopts the following technical solution:

[0007] A drilling tool structure for core sampling includes a piling assembly, a sampling assembly, and a retrieval assembly. The piling assembly includes an outer tube, a stop, and a drill bit. The drill bit is connected to one end of the outer tube, and the stop is connected to the other end of the outer tube. The sampling assembly is disposed in the outer tube and includes a drill bit, an inner tube, and a sampling cylinder. The sampling cylinder is connected to one end of the inner tube, and the drill bit is connected to the other end of the inner tube. The sampling cylinder is disposed inside the drill bit and is connected to the bottom opening of the drill bit. A connector for connecting to the retrieval assembly is provided at the end of the drill bit away from the inner tube. The connector includes a connecting post connected to the drill bit and a locking block connected to the connecting post. The retrieval assembly includes a retrieval rod and a rotating clamping rod. Two rotating clamping rods are rotatably connected to one end of the retrieval rod. A clamping block is connected to one side of the two rotating clamping rods that are close to each other, and the locking block is clamped between the two clamping blocks.

[0008] By adopting the above technical solution, during core sampling, the stop head is connected to the drill rod, and the drill rod is connected to the drive device. The entire device is set vertically, and the drive device drives the drill rod and the stop head to rotate and press down, driving the outer tube into the rock stratum. As the outer tube is pressed down, the rock core enters the inner tube through the bottom opening of the sampling tube for sampling, achieving overall sampling of relatively long rock strata. After sampling is completed, the drill rod is removed, and the stop head is removed from the top of the outer tube. The retrieval rod is extended into the borehole and connected to the connector. Two clamping blocks clamp the connecting column, and two rotating clamping rods clamp the locking block. The hoisting device is connected to the top of the retrieval rod, and the retrieval assembly and the sampling assembly connected to the retrieval assembly are lifted. The sampling tube is removed, and the rock stratum embedded in the inner tube is extracted as a whole for analysis. Through the cooperation of the piling assembly, sampling assembly, and retrieval assembly, simultaneous piling and core sampling are achieved, enabling stable sampling of relatively thick rock strata.

[0009] Optionally, the salvage assembly further includes a salvage block connected to one end of the salvage rod. The end of the salvage block away from the salvage rod is open. An installation slot is formed along the length of the salvage block, extending through both sides of the salvage block in the diameter direction. The installation slot communicates with the inner cavity of the salvage block. Two rotating clamping rods are disposed in the installation slot. A rotating shaft passes through the salvage block, extending into the installation slot and simultaneously rotatably connected to the middle position of the two rotating clamping rods. A return spring is connected between the two rotating clamping rods, and the return spring is disposed at the end of the rotating clamping rod away from the clamping block.

[0010] By adopting the above technical solution, when the retrieval rod is pushed downwards, the locking block enters the inner cavity of the retrieval block through the bottom opening. The locking block simultaneously pushes the two clamping blocks away from each other, causing the two rotating clamping rods to rotate simultaneously, and the return spring is compressed, accumulating elastic potential energy. When the two clamping blocks are pushed to the position of the connecting post, the return spring extends and releases elastic potential energy. The two rotating clamping rods rotate under the push of the return spring, and the two clamping blocks clamp the connecting post. The tops of the two clamping blocks engage with the bottom of the locking block, achieving a quick connection between the retrieval assembly and the connecting piece. When it is necessary to separate the retrieval assembly from the connecting piece, the tops of the two rotating clamping rods are pushed into the mounting slot, separating the clamping blocks from the connecting post, thus achieving disassembly of the retrieval assembly.

[0011] Optionally, a support assembly is provided between the inner tube and the outer tube. The support assembly includes a support block, a pressing cylinder block, a connecting slide rod, and a tension spring. The outer ring wall of the pressing cylinder block is detachably connected to the inner wall of the outer tube. The bottom end of the pressing cylinder block is provided with a pressing cone surface. The outer diameter of the pressing cylinder block decreases from top to bottom. One end of the connecting slide rod is connected to the outer wall of the inner tube, and the other end is slidably connected to the support block. The support block is located between the inner tube and the outer tube and below the pressing cylinder block. The top end of the support block is provided with an abutting slope corresponding to the pressing cone surface. The tension spring is sleeved on the connecting slide rod. One end of the tension spring is connected to the inner tube, and the other end is connected to the support block. In its natural state, the side of the support block closest to the outer tube is separated from the inner wall of the outer tube, and the abutting slope is separated from the pressing cone surface.

[0012] By adopting the above technical solution, when the core enters the inner tube and exerts upward pressure on it, the abutting inclined surface at the top of the support block comes into contact with the extrusion cone surface at the bottom of the extrusion cylinder block, generating extrusion. Under the extrusion of the extrusion cylinder, the support block moves towards the inner wall of the outer tube, and the support block and the connecting slide rod slide relative to each other. One side of the support block presses against the inner wall of the outer tube, the tension spring stretches and accumulates elastic potential energy, and the support block supports the inner tube through the connecting slide rod, reducing the possibility of the inner tube bending or deforming during descent and improving the stability of the inner tube during core sampling.

[0013] Optionally, a roller is rotatably disposed on the extrusion cone surface, and the roller is disposed corresponding to the abutting inclined surface of the support block.

[0014] By adopting the above technical solution, the roller configuration transforms the sliding friction between the extrusion cone surface and the abutting inclined surface into rolling friction, reducing the friction between the two and the possibility of wear between the support block and the extrusion cylinder block, thus helping to extend the service life of the device.

[0015] Optionally, an anti-slip pad is connected to the side of the support block near the inner wall of the outer cylinder.

[0016] By adopting the above technical solution, the anti-slip pad increases the friction between the support block and the inner wall of the outer tube, reducing the possibility of relative sliding between the support block and the inner wall of the outer tube.

[0017] Optionally, the stop head has a first communication port on the side away from the outer tube for the connector to pass through. A damping component is provided in the inner cavity of the stop head. The damping component includes a damping plate and a damping spring. The damping plate has a second communication port for the connector to pass through. The damping plate is slidably connected to the stop head. One end of the damping spring is connected to the inner wall of the stop head away from the outer tube, and the other end is connected to the damping plate. In its natural state, the damping plate is pressed against the drill bit.

[0018] By adopting the above technical solution, when the sampling component moves upward as a whole in the outer tube, the top of the drill bit is pressed against the bottom surface of the damping plate, the damping spring is compressed and accumulates elastic potential energy, and the damping spring buffers the sampling component, reducing the possibility of the sampling component bending and deforming when it is subjected to upward pressure as a whole.

[0019] Optionally, the edge of the damping plate is connected to a slider, and a groove is formed on the inner ring wall of the stop along the central axis, and the slider is slidably connected in the groove.

[0020] By adopting the above technical solution, when the damping plate buffers the sampling component, the slider slides in the groove. The setting of the slider groove realizes the guiding and limiting of the damping plate, reducing the possibility of the damping plate tilting during movement.

[0021] Optionally, the sampling cylinder is threaded to the bottom end of the inner tube, the diameter of the sampling cylinder decreases in the direction away from the inner tube, and a plurality of baffles are connected circumferentially on the inner wall of the sampling cylinder. The baffles are disposed at the end of the sampling cylinder away from the inner tube, and the side of the baffle away from the sampling cylinder extends obliquely upward.

[0022] By adopting the above technical solution, when sampling, the rock core enters the inner tube through the bottom opening of the sampling cylinder. As the rock core enters, it pushes the baffle open. When the sampling assembly is lifted upwards, the upward-sloping baffle blocks the inner tube and the rock core in the sampling cylinder, reducing the possibility of the rock core falling out of the inner tube.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By coordinating the piling components, sampling components, and retrieval components, simultaneous piling and core sampling are achieved, enabling stable sampling of thicker rock strata.

[0025] 2. The rollers reduce the likelihood of wear between the support block and the extrusion cylinder, helping to extend the service life of the device;

[0026] 3. The baffle reduces the possibility of the core falling out of the inner tube. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the structure of a drill bit used for core sampling, as described in this application.

[0028] Figure 2 This is a structural schematic diagram illustrating the piling assembly in the embodiments of this application.

[0029] Figure 3 This is a partial sectional view used in the embodiments of this application to illustrate the internal structure of the outer tube.

[0030] Figure 4 This is a schematic diagram illustrating the structure of the sampling component in the embodiments of this application.

[0031] Figure 5 This is an exploded view used to illustrate the salvage components in the embodiments of this application.

[0032] Figure 6 yes Figure 3 Enlarged view of part A in the middle.

[0033] Figure 7 yes Figure 3 Enlarged view of section B in the middle.

[0034] Explanation of reference numerals in the attached drawings: 1. Piling assembly; 101. Stop; 102. Connecting chamber; 103. Outer pipe; 104. Expanded pipe section; 105. Drill bit; 106. First connecting port; 2. Sampling assembly; 21. Connector; 211. Connecting column; 212. Clamping block; 22. Drill tool; 23. Inner pipe; 24. Sampling cylinder; 25. Baffle; 3. Salvage assembly; 31. Salvage rod; 32. Salvage block; 33. Rotating clamping rod; 34. Clamping block 35. Return spring; 36. Rotating shaft; 37. Connecting through hole; 38. Mounting through groove; 4. Support assembly; 41. Support block; 42. Extrusion cylinder block; 43. Connecting slide rod; 44. Limiting block; 45. Tension spring; 46. Anti-slip pad; 47. Roller; 48. Limiting groove; 5. Shock absorption assembly; 51. Shock absorption plate; 52. Shock absorption spring; 53. Slider; 54. Slide groove; 6. Extrusion cone surface; 7. Abutting inclined surface; 8. Second connecting port. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-7 This application will be further described in detail below. An embodiment of this application provides a drill string 22 structure for core sampling, which enables stable sampling of relatively thick rock strata.

[0036] Reference Figure 1 and Figure 2A drilling tool 22 for core sampling includes a piling assembly 1, a sampling assembly 2, a retrieval assembly 3, a support assembly 4, and a shock-absorbing assembly 5. The piling assembly 1 includes a stop 101, a connecting chamber 102, an outer tube 103, an expanding section 104, and a drill bit 105. The stop 101 is a cylindrical shape with one open end, and a first connecting port 106 is provided at the center of the closed end of the stop 101. The open end of the stop 101 is threaded to the opening of one end of the connecting chamber 102, and the end of the connecting chamber 102 away from the stop 101 is threaded to one end of the outer tube 103. The expanding section 104 is connected to the outer annular wall of the outer tube 103, and is located at the end of the outer tube 103 away from the connecting chamber 102. The drill bit 105 is threaded to the end of the expanding section 104 away from the connecting chamber 102, and the end of the drill bit 105 away from the outer tube 103 is open. The inner cavities of the stop 101, connecting chamber 102, outer pipe 103, and drill bit 105 are connected.

[0037] Reference Figure 3 and Figure 4 The sampling assembly 2 is disposed within the cavity formed by the stop head 101, the outer tube 103, and the drill bit 105. The sampling assembly 2 includes a connector 21, a drill bit 22, an inner tube 23, and a sampling cylinder 24. The connector 21 includes a connecting post 211 and a locking block 212 fixedly connected to one end of the connecting post 211. The end of the connecting post 211 away from the locking block 212 is fixedly connected to one end of the drill bit 22 along its length. The locking block 212 is frustoconical in shape, and its diameter gradually decreases along the direction away from the drill bit 22. The inner tube 23 is fixedly connected to the end of the drill bit 22 away from the connector 21, and the drill bit 22 and the inner tube 23 are coaxially arranged. The sampling cylinder 24 is threadedly connected to the end of the inner tube 23 away from the drill bit 22, and its diameter gradually decreases along the direction away from the drill bit 22. Several baffles 25, made of elastic material, are fixedly connected to the inner wall of the sampling cylinder 24. These baffles 25 are arranged circumferentially on the inner wall of the sampling cylinder 24, with the baffles 25 located at the end of the sampling cylinder 24 furthest from the inner tube 23. The end of the baffles 25 furthest from the inner wall of the sampling cylinder 24 extends upwards at an angle. The inner tube 23 is located inside the outer tube 103, with a gap between them. The sampling cylinder 24 is located inside the drill bit 105.

[0038] Reference Figure 1 , Figure 3 and Figure 5The salvage assembly 3 includes a salvage rod 31, a salvage block 32, a rotating clamping rod 33, a clamping block 34, a return spring 35, and a rotating shaft 36. One end of the salvage rod 31 is threadedly connected to one end of the salvage block 32. A connecting through hole 37 is provided at the end of the salvage rod 31 away from the salvage block 32, and an opening is provided at the end of the salvage block 32 away from the salvage rod 31. An installation through groove 38 is provided on the salvage block 32 along its length, penetrating both ends of the salvage block 32 in its diameter direction, and communicating with the inner cavity of the salvage block 32. Two rotating clamping rods 33 are provided in the installation through groove 38 along the length of the salvage block 32. The clamping block 34 is fixedly connected to the bottom end of the rotating clamping rods 33 and is located on the side where the two rotating clamping rods 33 are close to each other. The rotating shaft 36 is horizontally connected to the retrieval block 32 and extends into the mounting slot 38. The middle sections of the two rotating clamping rods 33 are simultaneously rotatably connected to the rotating shaft 36. The return spring 35 is connected between the top ends of the two rotating clamping rods 33. In its natural state, the distance between the two clamping blocks 34 is less than the diameter of the connecting column 211.

[0039] Reference Figure 3 and Figure 6 The support assembly 4 is provided with several sets on the inner tube 23. The support assembly 4 includes a support block 41, a pressing cylinder block 42, a connecting slide rod 43, a limiting block 44, a tension spring 45, an anti-slip pad 46, and a roller 47. The outer ring wall of the pressing cylinder block 42 is provided with external threads, and the inner diameter of the pressing cylinder block 42 is larger than the outer diameter of the inner tube 23. The outer ring wall of the pressing cylinder block 42 is threaded to the inner wall of the outer tube 103, and the pressing cylinder block 42 is located at the end of the outer tube 103 near the connecting chamber 102. The bottom end of the pressing cylinder block 42 is provided with a pressing cone surface 6, and the outer diameter of the pressing cylinder block 42 gradually decreases from top to bottom. One end of the connecting slide rod 43 is fixedly connected to the outer wall of the inner tube 23, and the connecting slide rod 43 is horizontally arranged. The limiting block 44 is connected to the end of the connecting slide rod 43 away from the inner tube 23. A support block 41 is positioned between the outer tube 103 and the inner tube 23, below the extrusion cylinder block 42. The top of the support block 41 has an abutment slope 7 corresponding to the extrusion cone surface 6. Several rollers 47 are rotatably connected to the extrusion cone surface 6, with each roller corresponding to the abutment slope 7. A limiting groove 48 is horizontally formed inside the support block 41. A connecting slide rod 43 passes through the support block 41 and extends into the limiting groove 48. A limiting block 44 is slidably connected within the limiting groove 48. A tension spring 45 is sleeved on the connecting slide rod 43. One end of the tension spring 45 is fixedly connected to the outer annular wall of the inner tube 23, and the other end is fixedly connected to the support block 41. In its natural state, the support block 41 is separated from the inner annular wall of the outer tube 103, and the abutment slope 7 is separated from the extrusion cone surface 6. An anti-slip pad 46 is fixedly connected to the side wall of the support block 41 near the inner wall of the outer tube 103.

[0040] Reference Figure 3 and Figure 7The damping component 5 is disposed within the inner cavity of the stop head 101. The damping component 5 includes a damping plate 51, a damping spring 52, and a slider 53. The damping plate 51 is slidably disposed within the inner cavity of the stop head 101, and a second connecting port 8 corresponding to the first connecting port 106 is provided on the damping plate 51. The damping spring 52 is disposed within the stop head 101, with one end connected to the inner bottom wall of the stop head 101 and the other end connected to the damping plate 51. Several sliders 53 are provided on the edge of the damping plate 51, and a groove 54 corresponding to the slider 53 is provided on the inner ring wall of the stop head 101 along the direction of the central axis, and the slider 53 is slidably connected in the groove 54. In the natural state, the damping plate 51 abuts against the end of the drill bit 22, and the connecting piece 21 passes through the first connecting port 106 and the second connecting port 8, exiting the damping plate 51 and the stop head 101.

[0041] Reference Figure 2 and Figure 4 Before core sampling, the stop 101 is opened, the sampling assembly 2 is placed in the outer tube 103, and the extrusion block 42 is connected to the inner annular wall of the outer tube 103. The stop 101 is connected to the drill rod, which rotates downward under the drive of the drive device, and the outer tube 103 is driven into the rock formation. As the outer tube 103 descends, the sampling assembly 2 enters the inner tube 23 through the bottom opening of the sampling cylinder 24 for sampling. During the process of the core entering the inner tube 23, the baffle 25 rotates under the push of the upward-moving core. After sampling is completed, the upward-tilted baffle 25 supports and blocks the core in the inner tube 23, reducing the possibility of the core falling out of the inner tube 23.

[0042] Reference Figure 3 and Figure 6 When the core sample enters the inner tube 23 through the bottom opening of the sampling cylinder 24, it exerts a vertically upward pressure on the inner tube 23. The abutting inclined surface 7 at the top of the support block 41 and the extrusion cone surface 6 at the bottom of the extrusion cylinder block 42 compress each other, causing the support block 41 to move away from the outer ring wall of the inner tube 23 under compression. The limiting block 44 connected to the connecting slide rod 43 slides in the limiting groove 48, and the tension spring 45 is stretched to accumulate elastic potential energy. The anti-slip pad 46 connected to the support block 41 abuts against the inner ring wall of the outer tube 103, and the support block 41 supports the inner tube 23, reducing the possibility of the inner tube 23 bending and deforming under compression. The roller 47 abuts against the abutting inclined surface 7 of the support block 41, reducing the friction between the support block 41 and the extrusion cylinder block 42, which helps to extend the service life of the device.

[0043] Reference Figure 3 and Figure 7When the sampling component 2 moves under upward pressure, the drill string 22 compresses the damping plate 51, and the damping spring 52 cushions the damping plate 51 and the sampling component 2. The slider 53 slides in the groove 54, reducing the possibility of the damping plate 51 deflecting.

[0044] Reference Figure 1 , Figure 5 and Figure 7 After sampling, the stop 101 is removed from the connecting chamber 102, the extrusion cylinder 42 is removed from the inner wall of the outer tube 103, and the retrieval assembly 3 is placed into the borehole. The conical surface of the locking block 212 compresses the two clamping blocks 34. Under the push of the locking block 212, the two clamping blocks 34 move away from each other, causing the rotating clamping rod 33 to rotate. The return spring 35 connected between the rotating clamping rods 33 is compressed and accumulates elastic potential energy. When the two clamping blocks 34 move to the position of the connecting column 211, the return spring 35 extends and releases elastic potential energy. Under the push of the return spring 35, the two rotating clamping rods 33 rotate, and the two clamping blocks 34 clamp the connecting column 211. The bottom surface of the locking block 212 engages with the top surface of the clamping block 34. The setting of the return spring 35 realizes the automatic reset of the rotating clamping rod 33, which facilitates the installation of the retrieval assembly 3 and the connecting piece 21.

[0045] Reference Figure 3 , Figure 5 and Figure 7 Connect the connecting through hole 37 on the salvage rod 31 to the hoisting device (not shown in the attached diagram), and hoist the salvage assembly 3 and the sampling assembly 2 as a whole. Push the two rotating clamping rods 33 into the mounting through slot 38, and the clamping block 34 separates from the connecting column 211, thus disassembling the salvage assembly 3. Remove the sampling cylinder 24 from the bottom end of the inner tube 23, and remove the rock core from the inner tube 23 as a whole, thus achieving overall sampling and analysis of the thicker rock strata.

[0046] The implementation principle of a drill bit 22 structure for core sampling in this embodiment is as follows: the stop 101 is connected to the drill rod, which rotates downward under the drive of the drive device, and the outer tube 103 is driven into the rock strata. The core is sampled through the bottom opening of the sampling cylinder 24 into the inner tube 23. When the core exerts vertical upward pressure on the inner tube 23, the abutting inclined surface 7 at the top of the support block 41 and the extrusion cone surface 6 at the bottom of the extrusion cylinder block 42 are squeezed, and the support block 41 moves away from the outer ring wall of the inner tube 23 under the extrusion. The anti-slip pad 46 abuts against the inner ring wall of the outer tube 103, and the support block 41 supports the inner tube 23, reducing the possibility of the inner tube 23 bending and deforming under extrusion.

[0047] After sampling is completed, the retrieval assembly 3 is placed into the borehole. The two clamping blocks 34 move away from each other under the push of the locking block 212, causing the rotating clamping rod 33 to rotate. When the two clamping blocks 34 move to the position of the connecting column 211, the rotating clamping rod 33 rotates under the push of the return spring 35, and the two clamping blocks 34 clamp the connecting column 211. The retrieval assembly 3 and the sampling assembly 2 are then lifted as a whole. The rotating clamping rod 33 is pushed into the mounting slot 38, thus disassembling the retrieval assembly 3. The sampling cylinder 24 is removed from the bottom end of the inner tube 23, and the core sample from the inner tube 23 is extracted, achieving overall sampling of a relatively thick rock layer.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A structure for a coring drill tool (22) characterized by: The utility model relates to a drilling, sampling and fishing assembly, which comprises a drilling assembly (1), a sampling assembly (2) and a fishing assembly (3), the drilling assembly (1) comprises an outer tube (103), a head (101) and a drill bit (105), the drill bit (105) is connected to one end of the outer tube (103), the head (101) is connected to the other end of the outer tube (103), the sampling assembly (2) is arranged in the outer tube (103), the sampling assembly (2) comprises a drill tool (22), an inner tube (23) and a sampling cylinder (24), the sampling cylinder (24) is connected to one end of the inner tube (23), the drill tool (22) is connected to the other end of the inner tube (23), the sampling cylinder (24) is arranged in the drill bit (105) and the sampling cylinder (24) is arranged in open communication with the bottom end of the drill bit (105), the drill tool (22) is provided with a connecting piece (21) connected to the fishing assembly (3) at the end away from the inner tube (23), the connecting piece (21) comprises a connecting column (211) connected to the drill tool (22) and a clamping block (212) connected to the connecting column (211), the fishing assembly (3) comprises a fishing rod (31) and a rotating clamp rod (33), the rotating clamp rod (33) is rotatably connected to one end of the fishing rod (31), two rotating clamp rods (33) are connected to the clamping blocks (34) on the side close to each other, and the clamping block (212) is clamped between the two clamping blocks (34).

2. A drill tool (22) structure for core sampling according to claim 1, characterized in that: The fishing assembly (3) further comprises a fishing block (32), the fishing block (32) is connected to one end of the fishing rod (31), the fishing block (32) is provided with an opening at the end away from the fishing rod (31), the fishing block (32) is provided with an installation through groove (38) along the length direction, the installation through groove (38) penetrates through the two sides of the fishing block (32) in the diameter direction, the installation through groove (38) is in communication with the inner cavity of the fishing block (32), the two rotating clamp rods (33) are arranged in the installation through groove (38), the fishing block (32) is provided with a rotating shaft (36), the rotating shaft (36) extends into the installation through groove (38) and is rotatably connected to the middle positions of the two rotating clamp rods (33), the two rotating clamp rods (33) are connected to a reset spring (35), and the reset spring (35) is arranged at the end of the rotating clamp rod (33) away from the clamping block (34).

3. A drill tool (22) structure for core sampling according to claim 1, characterized in that: Support assembly (4) is arranged between the inner tube (23) and the outer tube (103), the support assembly (4) comprises support block (41), extrusion cylinder block (42), connecting slide rod (43) and tension spring (45), the outer ring wall of the extrusion cylinder block (42) is detachably connected to the inner wall of the outer tube (103), the bottom end of the extrusion cylinder block (42) is provided with extrusion taper surface (6), the outer diameter of the extrusion cylinder block (42) decreases from top to bottom, one end of the connecting slide rod (43) is connected with the outer wall of the inner tube (23), the other end is slidably connected with the support block (41), the support block (41) is arranged between the inner tube (23) and the outer tube (103) and below the extrusion cylinder block (42), the top end of the support block (41) is provided with abutting inclined surface (7) corresponding to the extrusion taper surface (6), the tension spring (45) is sleeved on the connecting slide rod (43), one end of the tension spring (45) is connected with the inner tube (23), the other end is connected with the support block (41), in the natural state, the side of the support block (41) close to the outer tube (103) is separated from the inner wall of the outer tube (103), and the abutting inclined surface (7) is separated from the extrusion taper surface (6).

4. A drill tool (22) structure for core sampling according to claim 3, characterized in that: The extrusion taper surface (6) is rotatably provided with a roller (47), and the roller (47) is correspondingly arranged with the abutting inclined surface (7) of the support block (41).

5. A drill tool (22) structure for core sampling according to claim 4, characterized in that: The side of the support block (41) close to the inner wall of the outer tube is connected with a non-slip pad (46).

6. A drill tool (22) structure for core sampling according to claim 5, characterized in that: The side of the stop head (101) away from the outer tube (103) is provided with a first communication port (106) for the connecting piece (21) to pass out, and a shock absorption assembly (5) is arranged in the inner cavity of the stop head (101), the shock absorption assembly (5) comprises a shock absorption plate (51) and a shock absorption spring (52), the shock absorption plate (51) is provided with a second communication port (8) for the connecting piece (21) to pass through, and the shock absorption plate (51) is slidably connected in the stop head (101), one end of the shock absorption spring (52) is connected to the inner wall of the stop head (101) away from the outer tube (103), and the other end is connected with the shock absorption plate (51), and in the natural state, the shock absorption plate (51) is abutted tightly with the drilling tool (22).

7. A drill tool (22) structure for core sampling according to claim 6, characterized in that: The edge of the shock absorption plate (51) is connected with a sliding block (53), and the inner ring wall of the stop head (101) is provided with a sliding groove (54) along the central axis direction, and the sliding block (53) is slidably connected in the sliding groove (54).

8. A drill tool (22) structure for core sampling according to claim 1, characterized in that: The sampling cylinder (24) is threadedly connected to the bottom end of the inner tube (23), the diameter of the sampling cylinder (24) decreases away from the inner tube (23), a plurality of baffles (25) are connected to the inner wall of the sampling cylinder (24) along the circumference, the baffles (25) are arranged at one end of the sampling cylinder (24) away from the inner tube (23), and the side of the baffle (25) away from the sampling cylinder (24) is inclinedly and upwardly extended.

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