Salvage and throwing device for inner pipe assembly of wire-line coring drilling tool

Abstract

The utility model relates to a fishing and throwing device for an inner pipe assembly of a wire-line coring drilling tool, and belongs to the technical field of geological drilling. According to the technical scheme, a recovery slope is arranged at the upper end of a salvage hook and matched with a limiting slope on the inner side of the lower end of a card releasing sleeve; a salvage slope is arranged in the middle of each salvage hook, the salvage slopes are matched with an inner groove in the inner wall of the inner pipe assembly, and after the upper ends of the two salvage hooks are opened, steps of the salvage slopes extend out of the long groove holes to hook the inner groove in the inner wall of the inner pipe assembly; the centralizing heavy hammer and the connecting sleeve can slide up and down along the sliding rod and the fishing hook frame, and the centralizing heavy hammer hammers the clamping releasing sleeve on the fishing hook frame downwards. The utility model has the beneficial effects that the design of a salvage spearhead on the inner pipe assembly is eliminated, the inner pipe assembly is directly salvaged and recovered, and the salvage failure caused by the toppling of the salvage spearhead is avoided; no matter whether water exists in a well or not, the inner pipe assembly can be conveyed to the hole bottom of the dry hole through the device, buoyancy buffering of water is not needed, and a drilling tool cannot be damaged.

Description

Technical Field

[0001] This utility model relates to a retrieval and deployment device for the inner tube assembly of a wireline coring drill bit, belonging to the field of geological drilling technology. Background Technology

[0002] Wireline coring drilling tools have become highly mature and are widely used in geology, coal, petroleum, and scientific drilling. Wireline coring technology is an innovation on conventional drilling techniques, offering advantages such as high core recovery rates, long drill bit life, lower labor intensity for workers, higher production efficiency, and lower drilling costs compared to conventional methods. The specific process of wireline coring drilling is as follows: At the end of a drilling cycle, when the core is fully loaded into the core tube, instead of lifting the entire drilling assembly, a retrieval device with a wire rope is used to pull the core tube from the outer tube assembly (drill rod). After the core is retrieved, the core tube is directly lowered into the bottom of the hole from the outer tube assembly (drill rod) for further drilling. Existing wireline coring tools consist of an outer tube assembly and an inner tube assembly. The inner tube assembly includes a retrieval head, a spring clip assembly, and the core tube. The retrieval head extends from the top of the spring clip assembly and the core tube. For drilling safety, the retrieval head is generally designed with a rotating function. Existing technologies for retrieving coring tubes all involve lowering a retrieval device from inside the outer tube assembly (drill pipe), clamping the retrieval spearhead with the retrieval device, and then lifting the coring tube from the inner tube assembly to the wellhead. Examples include Chinese patent applications CN202122420131.3 ("A Wireline Coring Retrieval Device"), CN201310437812.8 ("Retrieval Device for Wireline Coring Drill Strings"), and CN201921860833.X ("A Repeatable Retrieval Wireline Coring Device"). However, existing technologies sometimes fail to retrieve the coring tube due to the spearhead tip tipping over, leading to drill string lifting accidents. To address this, many researchers weld the spearhead shut, rendering it non-rotating, but this introduces safety hazards into the drilling process.

[0003] Furthermore, existing technologies typically deploy the inner tubing assembly directly into the well via the outer tubing assembly (drill pipe), relying on the buoyancy of the water in the well to cushion the impact and prevent damage to the wireline coring tool due to gravity. However, in complex and variable formations or during horizontal drilling, some wellheads may not return water or may have very low water levels (hundreds of meters below the surface), resulting in what is known as a dry borehole. In such cases, directly deploying the inner tubing assembly into the well without the buoyancy of water could damage the drilling tool due to impact. Therefore, how to safely and quickly deliver the inner tubing assembly to the bottom of a dry borehole is a pressing technical problem that needs to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to provide a retrieval and deployment device for the inner tube assembly of a wireline coring drill bit. This device eliminates the need for a retrieval spearhead on the inner tube assembly, allowing for direct retrieval and recovery of the inner tube assembly (including the internal coring tube), thus avoiding retrieval failure due to the spearhead tip tipping over. Regardless of whether there is water in the well, this invention can be used to deliver the inner tube assembly to the bottom of a dry hole without the need for water buoyancy buffering, preventing damage to the drill bit. It is safe, fast, simple, and easy to use, solving the aforementioned technical problems of existing technologies.

[0005] The technical solution of this utility model is:

[0006] A retrieval and deployment device for the inner tube assembly of a wireline coring drill bit includes a wire rope connector, a connecting sleeve, a sliding rod, a centering weight, a retrieval hook frame, a release sleeve, a fixing pin, and a retrieval hook. The upper end of the wire rope connector is connected to a wire rope, and the lower end of the wire rope connector is connected to the upper end of the connecting sleeve. The connecting sleeve has a hollow tube structure, and the upper end of the centering weight is connected to the lower end of the connecting sleeve. The centering weight has a hollow channel, through which the sliding rod passes, with its upper part entering the hollow part of the connecting sleeve. The sliding rod slides within the tube structure, with its lower end connected to the upper end of the hook frame. The hook frame is cylindrical, with an outer diameter smaller than the inner diameter of the hollow channel of the centering weight, allowing it to enter the hollow channel. A through hole is provided in the middle of the hook frame. The release sleeve is hollow, with the cylindrical hook frame housed within it and able to slide within the hollow structure. A limiting slope is provided on the inner side of the lower end of the release sleeve, and an axially spaced long groove is provided in the middle of the release sleeve. The fixing pin passes through the long groove on the release sleeve and the through hole on the hook frame, securing the hook frame. The hook holder is positioned and connected to the release sleeve; the lower end of the cylindrical hook holder has a long slot with two through holes on both sides, and a fixing pin is set at the lower end of the long slot. Two fishing hooks are installed in the long slot. The fishing hooks are long strip-shaped structures and are used in pairs. The lower ends of the two fishing hooks are hinged to the fixing pin, and a tension spring is sleeved on the fixing pin. The two ends of the tension spring are respectively locked onto the two fishing hooks; the two fishing hooks can rotate around the fixing pin to extend out of the long slot or retract into the long slot; the upper end of the fishing hook is provided with a recovery ramp. The recovery ramp matches the limiting ramp on the inner side of the lower end of the release sleeve, controlling the upper ends of the two retrieval hooks to open to both sides; the retrieval ramp is set in the middle part of the retrieval hook, and the retrieval ramp matches the inner groove on the inner wall of the inner tube assembly. After the upper ends of the two retrieval hooks open, the step of the retrieval ramp extends out of the long slot hole, hooks the inner groove on the inner wall of the inner tube assembly, and is engaged with the inner tube assembly; the straightening hammer and connecting sleeve can slide up and down along the sliding rod and the retrieval hook frame, and the straightening hammer hammers downward on the release sleeve on the retrieval hook frame.

[0007] Furthermore, a second through hole is provided in the middle part of the hook fishing frame. The second through hole and the first through hole are arranged perpendicular to each other at 90 degrees. A safety pin mounting hole is provided in the middle part of the release sleeve. The safety pin mounting hole is arranged perpendicular to the axis of the long slot. A safety pin is inserted into the second through hole on the hook fishing frame and the safety pin mounting hole on the release sleeve to fix the hook fishing frame and the release sleeve together and keep them stationary. After the safety pin is pulled out, the release sleeve can slide up and down along the hook fishing frame within the length range of the long slot.

[0008] Furthermore, spring expansion grooves are respectively provided on the two fishing hooks. The two ends of the expansion spring are respectively placed in the spring expansion grooves of the two fishing hooks. The two fishing hooks are buckled together and installed in the long slot hole at the lower end of the hook fishing frame through a second fixing pin.

[0009] Furthermore, a wire rope unloading device is provided between the wire rope connecting body and the connecting sleeve. The wire rope unloading device is a freely rotatable bearing structure. The wire rope can freely rotate through the bearing to unload the torsional force of the wire rope.

[0010] The beneficial effects of the present utility model are as follows: The design of the fishing spearhead on the inner pipe assembly is cancelled, and the inner pipe assembly (including the core barrel inside) can be directly fished and recovered, avoiding the fishing failure caused by the倾倒 of the fishing spearhead. Whether there is water in the well or not, the present utility model can be used to send the inner pipe assembly to the bottom of the dry hole. It does not require the buoyancy buffer of water, will not damage the drilling tools, is safe, fast, simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic view of the fishing state of an embodiment of the present utility model;

[0012] Figure 2 is a schematic view of the state of sending into the dry hole of an embodiment of the present utility model;

[0013] Figure 3 is a schematic view of the release sleeve of an embodiment of the present utility model;

[0014] Figure 4 is a schematic view of the fishing hook of an embodiment of the present utility model;

[0015] Figure 5 is a schematic view of the inner pipe assembly supporting the present utility model;

[0016] Figure 6 is a schematic view of the fishing state of the inner pipe assembly of an embodiment of the present utility model;

[0017] [[ID=​​​​​​​In the diagram: 1. Wire rope connector; 2. Straightening weight; 3. Locking nut; 4. Hook holder; 5. Release sleeve; 6. Safety pin; 7. Fixing pin one; 8. Retrieval hook; 9. Spring; 10. Fixing pin two; 11. Wire rope unloading device; 12. Connecting sleeve; 13. Safety pin mounting hole; 14. Long groove; 15. Limiting inclined surface; 16. Spring groove; 17. Recovering inclined surface; 18. Retrieval inclined surface; 19. Fixing pin two mounting hole; 20. Inner tube assembly; 21. Inner groove; 22. Sliding rod; 23. Long groove hole; 24. Hollow channel; 25. Through hole one; 26. Through hole two. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] See attached document Figure 1-8A retrieval and deployment device for the inner tube assembly of a wireline coring drill bit includes a wire rope connector 1, a connecting sleeve 12, a sliding rod 22, a centering weight 2, a retrieval hook frame 4, a release sleeve 5, a fixing pin 7, and a retrieval hook 8. The upper end of the wire rope connector 1 is connected to a wire rope, and the lower end of the wire rope connector 1 is connected to the upper end of the connecting sleeve 12. The connecting sleeve 12 has a hollow tube structure, and the upper end of the centering weight 2 is connected to the lower end of the connecting sleeve 12. The centering weight 2 has a hollow channel 24, through which the sliding rod 22 passes, with its upper part entering the hollow part of the connecting sleeve 12. The sliding rod 22 slides within the tube structure, with its lower end connected to the upper end of the hook frame 4. The hook frame 4 is cylindrical, with an outer diameter smaller than the inner diameter of the hollow channel 24 of the centering weight 2, allowing it to enter the hollow channel 24. A through hole 25 is provided in the middle of the hook frame 4. The release sleeve 5 is hollow, with the cylindrical hook frame 4 housed within it and able to slide within the hollow structure of the release sleeve 5. A limiting inclined surface 15 is provided on the inner side of the lower end of the release sleeve 5, and an axially spaced long groove 14 is provided in the middle of the release sleeve 5. The fixing pin 7 passes through the long groove 14 on the release sleeve 5 and the through hole 25 on the hook frame 4, securing the hook frame. 4. The hook holder 4 is positioned and connected to the release sleeve 5; the lower end of the cylindrical hook holder 4 is provided with a long slot 23 that is open on both sides, and a fixing pin 20 is provided at the lower end of the long slot 23. Two fishing hooks 8 are installed in the long slot 23. The fishing hooks 8 are long strip structures and are used in pairs. The lower ends of the two fishing hooks 8 are hinged to the fixing pin 20. A tension spring 9 is sleeved on the fixing pin 20, and the two ends of the tension spring 9 are respectively locked on the two fishing hooks 8; the two fishing hooks 8 can rotate around the fixing pin 20 to extend out of the long slot 23 or retract into the long slot 23; the upper end of the fishing hook 8 is provided with a recovery slope 17 for recovery. The inclined surface 17 matches the limiting inclined surface 15 on the inner side of the lower end of the release sleeve 5, controlling the upper ends of the two fishing hooks 8 to open to both sides; the middle part of the fishing hook 8 is provided with a fishing inclined surface 18, which matches the inner groove 21 on the inner wall of the inner tube assembly 20. After the upper ends of the two fishing hooks 8 open, the step of the fishing inclined surface 18 extends out of the long slot hole 23, hooks the inner groove 21 on the inner wall of the inner tube assembly 20, and is engaged with the inner tube assembly 20; the straightening hammer 2 and the connecting sleeve 12 can slide up and down along the sliding rod 22 and the fishing hook frame 4, and the straightening hammer 2 hammers the release sleeve 5 on the fishing hook frame 4 downward.

[0022] See attached document Figure 8 The hook holder 4 has a second through hole 26 in the middle, which is arranged perpendicularly to the first through hole 25 at a 90-degree angle. (See attached diagram.) Figure 3 The release sleeve 5 has a safety pin mounting hole 13 in the middle, and the safety pin mounting hole 13 is arranged perpendicular to the axis of the long groove 14. (See attached diagram.) Figure 1A safety pin 6 is inserted into the through hole 26 on the hook frame 4 and the safety pin mounting hole 13 on the release sleeve 5 to fix the hook frame 4 and the release sleeve 5 together and keep them in place; after the safety pin 6 is pulled out, the release sleeve 5 can slide up and down along the hook frame 4 within the length range of the long groove 14.

[0023] See attached document Figure 4 Each of the two fishing hooks 8 is provided with a spring groove 16. The two ends of the spring 9 are respectively placed in the spring groove 16 of the two fishing hooks 8. The two fishing hooks 8 are fastened together and installed in the long slot 23 at the lower end of the fishing hook frame 4 by fixing pin 2 10.

[0024] See attached document Figure 1 A wire rope unloading device 11 is provided between the wire rope connector 1 and the connecting sleeve 12. The wire rope unloading device 11 is a freely rotatable bearing structure. The wire rope can rotate freely through the bearing to unload the torsional force of the wire rope.

[0025] See attached document Figure 1 The lower end of the sliding rod 22 is provided with an external thread, and the upper end of the hook frame 4 is provided with an internal thread. The sliding rod 22 and the hook frame 4 are connected by a threaded matching and a locking nut 3 is provided. The locking nut 3 locks the sliding rod 22 and the hook frame 4.

[0026] See attached document Figure 4 The lower part of the retrieval hook 8 is provided with a fixing pin mounting hole 19, and the fixing pin 10 is hinged to the lower part of the retrieval hook 8 through the fixing pin mounting hole 19.

[0027] This utility model can retrieve and insert the inner tube assembly 20. It can be used regardless of whether there is water in the well or whether it is a dry well. The specific operation is as follows:

[0028] 1. Salvage the inner tube assembly

[0029] See attached document Figure 1 and 6At this point, safety pin 6 needs to be inserted into the through hole 26 on the hook frame 4 and the safety pin installation hole 13 on the release sleeve 5. Fixing pin 7 is located at the lowest point of the long groove 14. The recovery slope 17 at the upper end of the fishing hook 8 cooperates with the limiting slope 15 on the inner side of the lower end of the release sleeve 5. The utility model is lowered to the bottom of the well by steel wire rope. After reaching the bottom, the steel wire rope is lowered further. The connecting sleeve 12 and the straightening hammer 2 rely on gravity to hammer the release sleeve 5 downward along the sliding rod 22. Because the safety pin 6 is fixed in place, the release sleeve 5 moves downward along the hook frame 4 and the integrated sliding rod 22 after being subjected to force. When the fishing slope 18 in the middle of the fishing hook 8 touches the upper end of the inner tube assembly 20, it moves inward. The hook retracts and enters the inner tube assembly 20. When the retrieval ramp 18 in the middle of the retrieval hook 8 enters the inner groove 21 at the upper end of the inner tube assembly 20, the retrieval ramp 18 in the middle of the retrieval hook 8 enters the inner groove 21 and hooks the inner tube assembly 20 under the action of the tension spring 9. At this time, the steel wire rope can be pulled upward to pull the connecting sleeve 12 and the straightening weight 2, which are connected as a whole, to move upward along the sliding rod 22. The force of the steel wire rope can be used to determine whether the inner tube assembly 20 has been retrieved. If it has been retrieved, the steel wire rope can be pulled up to retrieve the inner tube assembly 20 (including the core tube inside the inner tube assembly 20). If it has not been retrieved, the steel wire rope can be pulled up and down repeatedly to repeat the above actions until the inner tube assembly 20 has been retrieved.

[0030] 2. Insert the dry hole into the inner tube assembly.

[0031] At this point, safety pin 6 needs to be removed, fixing pin 7 is located at the lowest point of long groove 14, and the recovery ramp 17 at the upper end of the retrieval hook 8 cooperates with the limiting ramp 15 on the inner side of the lower end of the release sleeve 5; use the retrieval ramp 18 in the middle of the retrieval hook 8 to hook the inner groove 21 of the inner tube assembly 20, and release the wire rope to send the inner tube assembly 20 to the bottom of the hole; after reaching the bottom, by retracting and releasing the wire rope, the connecting sleeve 12 and the straightening hammer 2 rely on gravity to hammer the release sleeve 5 downward along the sliding rod 22, as shown in the attached document. Figure 7 The release sleeve 5 slides downward along the hook frame 4 within the length of the long groove 14. The recovery slope 17 at the upper end of the fishing hook 8 gradually disengages from the limiting slope 15 on the inner side of the lower end of the release sleeve 5 and enters the hollow tube structure of the release sleeve 5. The upper ends of the two fishing hooks 8 that have entered the hollow tube structure of the release sleeve 5 retract inward, and the fishing slope 18 in the middle of the two fishing hooks 8 also retracts inward and leaves the inner groove 21 of the inner tube assembly 20, thus achieving release. The wire rope is lifted upward, and the two fishing hooks 8 leave the inner tube assembly 20, completing the insertion of the inner tube assembly 20 into the dry hole. At this time, the fixing pin 7 gradually approaches the highest point of the long groove 14, and the utility model is lifted out of the wellhead for standby by the wire rope.

Claims

1. A device for retrieving and deploying the inner tube assembly of a wireline coring drill bit, characterized in that: The system includes a wire rope connector (1), a connecting sleeve (12), a sliding rod (22), a centering weight (2), a hook frame (4), a release sleeve (5), a fixing pin (7), and a fishing hook (8). The upper end of the wire rope connector (1) is connected to a wire rope, and the lower end of the wire rope connector (1) is connected to the upper end of the connecting sleeve (12). The connecting sleeve (12) is a hollow tube structure, and the upper end of the centering weight (2) is connected to the lower end of the connecting sleeve (12). The center of the centering weight (2) has a hollow channel (24), and the sliding rod (22) passes through the hollow channel (24) of the centering weight (2). The upper part of the sliding rod (22) slides inside the hollow tube structure of the connecting sleeve (12), and the lower end of the sliding rod (22) slides inside the hollow tube structure of the connecting sleeve (12). The hook frame (4) is connected to the upper end of the hook frame (4). The hook frame (4) is cylindrical, and its outer diameter is smaller than the inner diameter of the hollow channel (24) of the straightening weight (2) and can enter the hollow channel (24). A through hole (25) is provided in the middle part of the hook frame (4). The release sleeve (5) is hollow. The cylindrical hook frame (4) is set in the release sleeve (5) and can slide in the hollow structure of the release sleeve (5). A limiting inclined surface (15) is provided on the inner side of the lower end of the release sleeve (5). A long groove (14) is provided in the middle part of the release sleeve (5) along the axial direction. The fixing pin (7) passes through the long groove (14) on the release sleeve (5) and the through hole (25) on the hook frame (4) to position the hook frame (4) and the release sleeve (5). Connection; the lower end of the cylindrical hook frame (4) is provided with a long slot (23) with two sides open, and a fixing pin (10) is provided at the lower end of the long slot (23). Two fishing hooks (8) are installed in the long slot (23). The fishing hooks (8) are long strip structures and are used in pairs. The lower ends of the two fishing hooks (8) are hinged to the fixing pin (10). A tension spring (9) is sleeved on the fixing pin (10). The two ends of the tension spring (9) are respectively locked on the two fishing hooks (8). The two fishing hooks (8) can extend out of the long slot (23) or retract into the long slot (23) by rotating around the fixing pin (10). The upper end of the fishing hook (8) is provided with a recovery slope (17). The recovery slope (17) and The limiting slope (15) on the inner side of the lower end of the release sleeve (5) matches and controls the upper ends of the two fishing hooks (8) to open to both sides; the middle part of the fishing hook (8) is provided with a fishing slope (18), which matches the inner groove (21) on the inner wall of the inner tube assembly (20). After the upper ends of the two fishing hooks (8) open, the step of the fishing slope (18) extends out of the long slot hole (23) and hooks the inner groove (21) on the inner wall of the inner tube assembly (20) and is engaged with the inner tube assembly (20); the straightening hammer (2) and the connecting sleeve (12) can slide up and down along the sliding rod (22) and the fishing hook frame (4). The straightening hammer (2) hammers the release sleeve (5) on the fishing hook frame (4) downward.

2. The retrieval and deployment device for the inner tube assembly of a wireline coring drill according to claim 1, characterized in that: The middle part of the hook frame (4) is provided with a second through hole (26), which is arranged perpendicularly to the first through hole (25) at 90 degrees. The middle part of the release sleeve (5) is provided with a safety pin installation hole (13), which is arranged perpendicularly to the axis of the long groove (14). A safety pin (6) is inserted into the second through hole (26) on the hook frame (4) and the safety pin installation hole (13) on the release sleeve (5) to fix the hook frame (4) and the release sleeve (5) together and keep them in place. After the safety pin (6) is pulled out, the release sleeve (5) can slide up and down along the hook frame (4) within the length range of the long groove (14).

3. A retrieval and deployment device for the inner tube assembly of a wireline coring drill according to claim 1 or 2, characterized in that: Each of the two fishing hooks (8) is provided with a spring groove (16), and the two ends of the spring (9) are placed in the spring groove (16) of the two fishing hooks (8). The two fishing hooks (8) are fastened together and installed in the long slot (23) at the lower end of the fishing hook frame (4) by fixing pin two (10).

4. The retrieval and deployment device for the inner tube assembly of a wireline coring drill according to claim 3, characterized in that: A wire rope unloading device (11) is provided between the wire rope connector (1) and the connecting sleeve (12), and the wire rope unloading device (11) is a freely rotatable bearing structure.

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