Drill rod salvage variable-diameter grabbing device

Abstract

The utility model relates to the technical field of drill rod salvage, in particular to a variable-diameter gripping device for drill rod salvage. The utility model provides a variable-diameter gripping device for fishing a drill rod, which can improve the stability of gripping a drill bit and prevent the drill bit from falling off from a mechanical claw. A variable-diameter gripping device for fishing a drill rod comprises a drill bit, a main body shell and the like, and the main body shell is arranged on the upper side of the drill bit. When a first threaded rod rotates, a second threaded rod moves upwards, a lifting rod is driven to move upwards through the acting force of a second spring, a threaded block moves upwards to make contact with the first threaded rod, and the first threaded rod expands the threaded block outwards to make contact with the threaded inner wall of a drill bit; and the effects that the stability of grabbing the drill bit can be improved, and the drill bit is prevented from falling off from the mechanical claw are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drill rod salvage, in particular to a drill rod salvage variable diameter grabbing device. Background Art

[0002] Drill pipe salvage is the process of handling accidents when drill pipes, drill collars, casing and other drilling tools are lost underground due to breakage, falling off, or stuck drill pipe during operations such as oil drilling, geological drilling, and water well drilling.

[0003] The existing drill pipe salvage is usually carried out by grabbing the drill pipe by bringing the claws of the variable diameter grabbing device close to each other, and then salvaging the drill pipe from the hole. However, since the existing variable diameter grabbing device only grabs the surface of the drill pipe by the teeth on the claws, when the coal seam pressure on the drill pipe is large, the drill pipe may fall off, which is very inconvenient.

[0004] Therefore, a drill pipe salvage variable-diameter grabbing device has been developed that can improve the stability of the drill bit grabbing and prevent the drill bit from falling off the mechanical claw. Utility Model Content

[0005] In order to overcome the disadvantages of the existing variable-diameter grasping device that only grasps the surface of the drill pipe by the teeth on the claw petals, and the drill pipe may fall off when the coal seam pressure on the drill pipe is large, the utility model provides a variable-diameter grasping device for drill pipe salvage, which can improve the stability of grasping the drill bit and prevent the drill bit from falling off the mechanical claws.

[0006] The technical solution is as follows: A variable-diameter grabbing device for drill pipe salvage, including a drill bit, a main body shell, a mechanical claw, a gear set, a motor, a threaded sleeve, a first threaded rod and an expansion mechanism. A main body shell is provided on the upper side of the drill bit, a motor is connected to the upper right side of the main body shell, a first threaded rod is rotatably connected inside the main body shell, a gear set is connected between the motor output shaft and the first threaded rod, a threaded sleeve is threadedly connected to the lower part of the first threaded rod, the threaded sleeve is slidably connected to the main body shell, a plurality of mechanical claws are rotatably connected to the threaded sleeve, and the mechanical claws are all rotatably connected to the main body shell. An expansion mechanism that can enhance the stability of drill bit grabbing is provided on the main body shell.

[0007] Furthermore, the lower portion of the first threaded rod is a conical structure.

[0008] Furthermore, the inner side of the mechanical claws is provided with tooth patterns.

[0009] Furthermore, the expansion mechanism includes a threaded block, a lifting rod, a first spring, a second spring and a second threaded rod. The second threaded rod is threadedly connected to the upper part of the first threaded rod, and the lifting rod is rotatably and slidably connected to the lower part of the first threaded rod. The second spring is connected between the lifting rod and the second threaded rod. A plurality of threaded blocks are slidably connected to the lower part of the lifting rod, and a first spring is connected between two adjacent threaded blocks.

[0010] Furthermore, it also includes a fixing rod, the upper side of the drill bit is connected with the fixing rod, and the fixing rod is slidably connected to the second threaded rod.

[0011] Furthermore, it also includes a water spray mechanism, which includes a connecting rod, a mud-proof sleeve, a water pipe, a nozzle and a fixed sleeve. A plurality of connecting rods are connected to the outside of the threaded sleeve, and the mud-proof sleeve is connected between the upper sides of the connecting rods. The main body shell passes through the mud-proof sleeve, and a plurality of water pipes are connected to the upper part of the main body shell. The lower sides of the water pipes are all connected to the nozzles. The mud-proof sleeve is located outside the nozzle, and the fixed sleeve is connected to the lower part of the main body shell, and the nozzles are all connected to the fixed sleeve.

[0012] The beneficial effects of the utility model are as follows: 1. When the first threaded rod of the utility model rotates, the second threaded rod moves upward, and the lifting rod is driven to move upward through the action force of the second spring, so that the threaded block moves upward and contacts the first threaded rod, so that the first threaded rod pushes the threaded block outward and contacts the inner wall of the thread of the drill bit, thereby achieving the effect of improving the stability of the drill bit grip and preventing the drill bit from falling off the mechanical claw.

[0013] 2. The utility model pushes the connecting rod upward while the threaded sleeve moves upward, so that the anti-mud sleeve moves upward and is no longer located outside the nozzle, so that water in the water pipe is sprayed out from the nozzle, thereby softening the coal body around the drill bit and preventing the coal body around the drill bit from drying and hardening, which makes it difficult to remove the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a cross-sectional view of the utility model.

[0016] Figure 3 It is a three-dimensional structural schematic diagram of the expansion mechanism of the utility model.

[0017] Figure 4 It is a partial three-dimensional structural schematic diagram of the expansion mechanism of the utility model.

[0018] Figure 5 It is a three-dimensional structural schematic diagram of the water spraying mechanism of the utility model.

[0019] Figure 6 It is a cross-sectional view of the water spraying mechanism of the utility model.

[0020] Figure numbers: 1_drill bit, 2_main body shell, 3_mechanical claw, 4_gear set, 5_motor, 6_threaded sleeve, 7_first threaded rod, 8_expansion mechanism, 81_threaded block, 82_lifting rod, 83_first spring, 84_second spring, 85_second threaded rod, 86_fixing rod, 9_water spraying mechanism, 91_connecting rod, 92_anti-mud sleeve, 93_water pipe, 94_sprinkler, 95_fixing sleeve. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] A drill pipe salvage variable diameter grabbing device, such as Figure 1 and Figure 2 As shown, it includes a drill bit 1, a main body shell 2, a mechanical claw 3, a gear set 4, a motor 5, a threaded sleeve 6, a first threaded rod 7 and an expansion mechanism 8. The main body shell 2 is provided on the upper side of the drill bit 1, and the motor 5 is connected to the upper right side of the main body shell 2. The first threaded rod 7 is rotatably connected inside the main body shell 2. The lower part of the first threaded rod 7 is a conical structure, which is convenient for grabbing the drill bit 1. The gear set 4 is connected between the output shaft of the motor 5 and the first threaded rod 7. The lower part of the first threaded rod 7 is threadedly connected to the threaded sleeve 6, and the threaded sleeve 6 is slidably connected to the main body shell 2. A plurality of mechanical claws 3 are rotatably connected to the threaded sleeve 6, and the inner sides of the mechanical claws 3 are provided with teeth to facilitate grabbing the drill bit 1. The mechanical claws 3 are rotatably connected to the main body shell 2, and an expansion mechanism 8 is provided on the main body shell 2.

[0023] like Figure 1 , Figure 3 and Figure 4 As shown, the expansion mechanism 8 includes a threaded block 81, a lifting rod 82, a first spring 83, a second spring 84, a second threaded rod 85 and a fixed rod 86. The second threaded rod 85 is threadedly connected to the upper inner portion of the first threaded rod 7. The lifting rod 82 is rotatably and slidably connected to the lower inner portion of the first threaded rod 7. The second spring 84 is connected between the lifting rod 82 and the second threaded rod 85. A plurality of threaded blocks 81 are slidably connected to the lower portion of the lifting rod 82. The first spring 83 is connected between each of the two adjacent threaded blocks 81. A fixed rod 86 is connected to the upper side of the drill bit 1, and the fixed rod 86 is slidably connected to the second threaded rod 85.

[0024] When the drill bit 1 falls into the coal body borehole, the utility model can be used. First, the main body shell 2 is extended into the hole into which the drill bit 1 falls, so that the mechanical claw 3 is located outside the drill bit 1, and then the motor 5 is started to make the gear set 4 mesh and move, driving the first threaded rod 7 to rotate, so that the threaded sleeve 6 moves upward, so that the mechanical claw 3 rotates to get close to each other and contact the drill bit 1, and contacts the surface of the drill bit 1 through the tooth pattern to grab the drill bit 1, and then the main body shell 2 is separated from the borehole, so that the drill bit 1 is separated from the borehole, and the drill rod can be salvaged. While the first threaded rod 7 rotates, the second threaded rod 85 moves upward in the fixed rod 86, and the lifting rod 82 is driven to move upward through the force of the second spring 84, so that the threaded block 81 moves upward and contacts the first threaded rod 7, so that the first threaded rod 7 pushes the threaded block 81 outward, and the threaded block 81 is tightened by the first spring 83, so that the threaded block 81 expands and contacts the inner wall of the thread of the drill bit 1, thereby improving the stability of the drill bit 1 and preventing the drill bit 1 from falling off the mechanical claw 3.

[0025] like Figure 1 , Figure 5 and Figure 6 As shown, a water spray mechanism 9 is also included, which includes a connecting rod 91, a mud-proof sleeve 92, a water pipe 93, a nozzle 94 and a fixed sleeve 95. A plurality of connecting rods 91 are connected to the outside of the threaded sleeve 6, and the mud-proof sleeve 92 is connected between the upper sides of the connecting rods 91. The main shell 2 passes through the mud-proof sleeve 92. A plurality of water pipes 93 are connected to the upper part of the main shell 2, and the lower sides of the water pipes 93 are all connected to the nozzles 94. The mud-proof sleeve 92 is located outside the nozzle 94, and the lower part of the main shell 2 is connected to the fixed sleeve 95, and the nozzles 94 are all connected to the fixed sleeve 95.

[0026] By using the water spraying mechanism 9 of the device, the coal body around the drill bit 1 can be softened. When the main shell 2 enters the drill hole, the anti-mud sleeve 92 prevents mud from clogging the nozzle 94. When the threaded sleeve 6 moves upward, it pushes the connecting rod 91 to move upward, so that the anti-mud sleeve 92 moves upward and is no longer located outside the nozzle 94, so that the water in the water pipe 93 is sprayed out from the nozzle 94, thereby softening the coal body around the drill bit 1 and preventing the coal body around the drill bit 1 from drying and hardening, which makes it difficult to remove the drill bit 1.

[0027] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A drill pipe salvage variable diameter grabbing device, characterized in that: The invention comprises a drill bit (1), a main body shell (2), a mechanical claw (3), a gear set (4), a motor (5), a threaded sleeve (6), a first threaded rod (7) and an expansion mechanism (8). The main body shell (2) is arranged on the upper side of the drill bit (1), the motor (5) is connected to the upper right side of the main body shell (2), the first threaded rod (7) is rotatably connected inside the main body shell (2), the gear set (4) is connected between the output shaft of the motor (5) and the first threaded rod (7), the lower part of the first threaded rod (7) is threadedly connected to the threaded sleeve (6), the threaded sleeve (6) is slidably connected to the main body shell (2), a plurality of mechanical claws (3) are rotatably connected to the threaded sleeve (6), the mechanical claws (3) are all rotatably connected to the main body shell (2), and the main body shell (2) is provided with an expansion mechanism (8) capable of enhancing the gripping stability of the drill bit (1).

2. A drill pipe salvage variable diameter grabbing device according to claim 1, characterized in that: The lower part of the first threaded rod (7) is a conical structure.

3. The drill pipe salvage variable diameter grabbing device according to claim 1, characterized in that: The inner sides of the mechanical claws (3) are all provided with tooth patterns.

4. The drill pipe salvage variable diameter grabbing device according to claim 1, characterized in that: The expansion mechanism (8) comprises a threaded block (81), a lifting rod (82), a first spring (83), a second spring (84) and a second threaded rod (85); the upper inner portion of the first threaded rod (7) is threadedly connected to the second threaded rod (85); the lower inner portion of the first threaded rod (7) is rotatably and slidably connected to the lifting rod (82); a second spring (84) is connected between the lifting rod (82) and the second threaded rod (85); a plurality of threaded blocks (81) are slidably connected to the lower portion of the lifting rod (82); and a first spring (83) is connected between two adjacent threaded blocks (81).

5. A drill pipe salvage variable diameter grabbing device according to claim 4, characterized in that: It also includes a fixing rod (86), the upper side of the drill bit (1) is connected to the fixing rod (86), and the fixing rod (86) is slidably connected to the second threaded rod (85).

6. A drill pipe salvage variable diameter grabbing device according to claim 4, characterized in that: The invention also comprises a water spray mechanism (9), which comprises a connecting rod (91), a mud-proof sleeve (92), a water pipe (93), a nozzle (94) and a fixed sleeve (95); a plurality of connecting rods (91) are connected to the outside of the threaded sleeve (6); the mud-proof sleeve (92) is connected between the upper sides of the connecting rods (91); the main body shell (2) passes through the mud-proof sleeve (92); a plurality of water pipes (93) are connected to the upper part of the main body shell (2); the lower sides of the water pipes (93) are all connected to the nozzle (94); the mud-proof sleeve (92) is located outside the nozzle (94); the lower part of the main body shell (2) is connected to the fixed sleeve (95); and the nozzles (94) are all connected to the fixed sleeve (95).

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