Underground cable fishing device

Abstract

The utility model provides an underground cable fishing device. The underground cable fishing device comprises a storage barrel. The surface of the central screw rod is provided with a convex thread, the convex thread spirally extends from the bottom end of the central screw rod to the top end of the central screw rod, the central screw rod is arranged in the storage barrel in a penetrating manner, and the convex thread is provided with a convex thread; the top of the central screw rod protrudes out of the top end of the storage barrel and is rotationally connected with the top end of the storage barrel, the bottom of the central screw rod protrudes out of the bottom end of the storage barrel, and the bottom end of the storage barrel is open; the first end of the upper connector is connected with the top of the center screw rod, and the second end of the upper connector is used for being connected with a fishing pipe column. The problem that in the prior art, an underground cable fishing tool is low in fishing efficiency is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole cable fishing, in particular to a downhole cable fishing device. Background Art

[0002] During the production process of the electric pump, the cable clips are prone to loosening and falling off, resulting in the asynchronous movement of the tubing and the cable during the process of lifting the electric pump upward. As a result, the cable accumulates and jams the string accident, and it is only possible to pour out the tubing and then fish for the cable.

[0003] Currently used cable fishing tools include external hooks, internal hooks, and tiger mouths. The tools are single and lack pertinence. Most of them are self-made, with uncertain arrangement and number of hook teeth, resulting in low fishing efficiency. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a downhole cable fishing device to solve the problem of low fishing efficiency of cable fishing tools in the prior art.

[0005] To achieve the above purpose and other related purposes, the present utility model provides a downhole cable fishing device, including a storage cylinder; a central screw rod, on the surface of the central screw rod, there are convex threads, the convex threads spiral from the bottom end of the central screw rod to the top end of the central screw rod, the central screw rod is arranged inside the storage cylinder, wherein, the top of the central screw rod protrudes from the top end of the storage cylinder and is rotationally connected to the top end of the storage cylinder, the bottom of the central screw rod protrudes from the bottom end of the storage cylinder, and the bottom end of the storage cylinder is open; an upper joint, the first end of the upper joint is connected to the top of the central screw rod, and the second end of the upper joint is used to be connected to a fishing string.

[0006] Preferably, a conical head is provided at the bottom end of the central screw rod.

[0007] Preferably, along the direction from the bottom end to the top end of the central screw rod, the pitch of the convex threads gradually increases.

[0008] Preferably, barbs are provided on the inner wall of the storage cylinder, and the barbs extend obliquely upward.

[0009] Preferably, a lower cam ring is fixedly provided at the top of the central screw rod, an upper cam ring is fixedly provided at the top end of the receiving cylinder body, and a spring is clamped between the top end of the receiving cylinder body and the first end of the upper joint. Wherein, a plurality of first sector-shaped convex steps are provided on the lower cam ring along the circumferential direction of the lower cam ring, the top surface of each first sector-shaped convex step is a first fitting surface, and along the first circumferential direction of the lower cam ring, the distance between each first fitting surface and the bottom of the lower cam ring gradually decreases; a plurality of second sector-shaped convex steps are provided on the upper cam ring along the circumferential direction of the upper cam ring, the bottom surface of each second sector-shaped convex step is a second fitting surface, along the first circumferential direction of the upper cam ring, the distance between each second fitting surface and the top of the upper cam ring gradually increases, the first fitting surface is in contact with the second fitting surface, and the first circumferential direction of the lower cam ring is the same as the first circumferential direction of the upper cam ring.

[0010] Preferably, the top of the central screw rod is fixedly welded to the lower cam ring, and the top end of the receiving cylinder body is fixedly welded to the upper cam ring.

[0011] Preferably, the top of the central screw rod is threadedly connected to the first end of the upper joint.

[0012] Preferably, the second end of the upper joint is provided with an internal thread.

[0013] As described above, the downhole cable fishing device of the present invention has the following beneficial effects: Connect a connecting rod of appropriate length to the upper joint so as to lower the downhole cable fishing device into the well. When fishing for the cable, rotate the connecting rod to drive the central screw rod to rotate together. As the central screw rod rotates, the downhole cable will be wound around the central screw rod. At the same time as rotating the central screw rod, apply a certain downward pressure to the fishing device. In this way, while the cable is wound around the central screw rod, the bottom end of the central screw rod can continuously penetrate downward into the accumulated cable. As a result, the cable will wind upward along the convex threads on the central screw rod and enter the interior of the receiving cylinder body from the bottom open end of the receiving cylinder body. The downward pressure applied will also assist in squeezing the cable wound around the bottom end of the central screw rod into the interior of the receiving cylinder body. After rotating the central screw rod to a certain torque, lift the fishing device out of the well. Due to the frictional force between the cable and the central screw rod and the receiving cylinder body, the cable will not fall downward, thus realizing the fishing of the downhole cable. Therefore, compared with the prior art, the downhole cable fishing device of the present invention has a simple structure, convenient operation, and high fishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It shows a three-dimensional structural schematic diagram of the downhole cable fishing device provided by the present invention.

[0015] Figure 2 Shown is a perspective view of the downhole cable fishing device provided by the present utility model.

[0016] Figure 3 Shown is a cross-sectional view of the downhole cable fishing device provided by the present utility model.

[0017] Figure 4 Shown is a schematic structural view of the cooperation between the upper cam ring and the lower cam ring provided by the present utility model.

[0018] Figure 5 Shown is a schematic structural view of the upper cam ring provided by the present utility model.

[0019] Figure 6 Shown is a schematic structural view of the lower cam ring provided by the present utility model.

[0020] Description of reference numerals:

[0021] 10 Storage cylinder

[0022] 101 Barbs

[0023] 102 Upper cam ring

[0024] 1020 Second sector convex step

[0025] 1021 Second fitting surface

[0026] 11 Central screw rod

[0027] 110 Convex thread

[0028] 111 Tapered head

[0029] 112 Lower cam ring

[0030] 1120 First sector convex step

[0031] 1121 First fitting surface

[0032] 12 Upper joint

[0033] 13 Spring Detailed implementation manners

[0034] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0035] In the description of the present utility model, it should be noted that unless otherwise specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present utility model is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] Please refer to Figures 1 to 6 . It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present utility model. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0038] The present utility model provides a downhole cable fishing device, as Figures 1 to 3 shown. The downhole cable fishing device includes a receiving cylinder 10, a central screw rod 11, and an upper joint 12. Specifically, convex threads 110 are provided on the surface of the central screw rod 11. The convex threads 110 helically extend from the bottom end to the top end of the central screw rod 11. The central screw rod 11 is disposed inside the receiving cylinder 10. The top of the central screw rod 11 protrudes from the top end of the receiving cylinder 10, and the top of the central screw rod 11 is rotatably connected to the top end of the receiving cylinder 10. The bottom of the central screw rod 11 protrudes from the bottom end of the receiving cylinder 10. Specifically, the bottom end of the receiving cylinder 10 is open; the first end of the upper joint 12 is connected to the top of the central screw rod 11, and the second end of the upper joint 12 is used to be connected to an external connecting rod.

[0039] When the downhole cable fishing device of the present utility model is in use, a fishing string of appropriate length is connected to the second end of the upper joint 12 so as to lower the downhole cable fishing device into the well. When fishing for the cable, the connecting rod is rotated to drive the central screw rod 11 to rotate together. As the central screw rod 11 rotates, the downhole cable will wind around the central screw rod 11. And while rotating the central screw rod 11, a certain downward pressure is applied to the fishing device. In this way, while the cable winds around the central screw rod 11, the bottom end of the central screw rod 11 can continuously penetrate downward into the accumulated cable. Thus, the cable will wind upward along the convex threads 110 on the central screw rod 11 and enter the interior of the receiving cylinder 10 from the bottom open end of the receiving cylinder. And the downward pressure applied will also assist in squeezing the cable wound around the bottom end of the central screw rod 11 into the interior of the receiving cylinder 10. After rotating the central screw rod 11 to reach a certain torque, the fishing device is lifted out of the well. The cable will not fall downward under the action of the frictional force between the central screw rod 11 and the receiving cylinder 10, thus realizing the fishing of the downhole cable. Therefore, compared with the prior art, the downhole cable fishing device of the present utility model has a simple structure, convenient operation and high fishing efficiency.

[0040] Specifically, as Figure 2 shown, in this embodiment, an external thread is provided at the top of the central screw rod 11. Correspondingly, an internal thread matching the external thread at the top of the central screw rod 11 is provided at the first end of the upper joint 12. The top of the central screw rod 11 is threadedly connected to the first end of the upper joint 12. The structure is simple and the connection is convenient.

[0041] Specifically, an internal thread is also provided at the second end of the upper joint 12, that is, the fishing string can be threadedly connected to the second end of the upper joint 12. The structure is simple and it is convenient for disassembly and assembly. Specifically, the fishing string can be an oil pipe.

[0042] Furthermore, in order to facilitate the central screw rod 11 to penetrate into the accumulated cable, preferably, as Figure 2 shown, a conical head 111 is provided at the bottom end of the central screw rod 11.

[0043] Furthermore, as Figure 2 shown, in this embodiment, the convex threads 110 extend from the bottom end to the top end of the central screw rod 11, and the pitch of the convex threads 110 gradually increases. Through this design, as the central screw rod 11 rotates, it can better facilitate the central screw rod 11 to penetrate into the accumulated cable, and can improve the advancing speed, thereby improving the cable fishing speed.

[0044] Furthermore, in order to further prevent the cable entering the interior of the receiving cylinder 10 from falling off the central screw rod 11, preferably, as Figure 2 andFigure 3 As shown, in this embodiment, barbs 101 are provided on the inner wall of the storage cylinder 10. The barbs 101 extend obliquely upward, that is, the barbs 101 extend obliquely in the direction close to the top of the storage cylinder 10. Through this structural design, the barbs 101 on the inner wall of the storage cylinder 10 can further prevent the cable entering the inside of the storage cylinder 10 from falling off the central screw rod.

[0045] Further, as Figures 2 to 6 shown, in this embodiment, a lower cam ring 112 is fixedly provided at the top of the central screw rod 11, and an upper cam ring 102 is fixedly provided at the top end of the storage cylinder 10. Among them, a plurality of first sector-shaped convex steps 1120 are provided on the lower cam ring 112 along the circumferential direction of the lower cam ring 112. The top surface of each first sector-shaped convex step 1120 is a first fitting surface 1121, and along the first circumferential direction of the lower cam ring 112, the distance between the first fitting surface 1121 of each first sector-shaped convex step 1120 and the bottom of the lower cam ring 112 gradually decreases. Correspondingly, a plurality of second sector-shaped convex steps 1020 are provided on the upper cam ring 102 along the circumferential direction of the upper cam ring 102. The bottom surface of each second sector-shaped convex step 1020 is a second fitting surface 1021, and along the first circumferential direction of the upper cam ring 102, the distance between the second fitting surface 1021 of each second sector-shaped convex step 1020 and the top of the upper cam ring 102 gradually increases. The first fitting surface 1121 of the first sector-shaped convex step 1120 is in contact with the second fitting surface 1021 of the second sector-shaped convex step 1020, and a spring 13 is clamped between the top end of the storage cylinder 10 and the first end of the upper joint 12. Specifically, the first circumferential direction of the lower cam ring 112 and the first circumferential direction of the upper cam ring 102 are the same. That is, the first circumferential direction of the lower cam ring 112 can be the clockwise direction along the circumferential direction of the lower cam ring 112, then the first circumferential direction of the upper cam ring 102 is also the clockwise direction along the circumferential direction of the upper cam ring 102; or, the first circumferential direction of the lower cam ring 112 is the counterclockwise direction of its circumferential direction, then the first circumferential direction of the upper cam ring 102 is also the counterclockwise direction of its circumferential direction. Through this structural design, as Figure 2As shown in the figure, when the central screw rod 11 rotates relative to the receiving cylinder body 10, it will drive the lower cam ring 112 to rotate relative to the upper cam ring 102. When the lower cam ring 112 rotates relative to the upper cam ring 102, the first fitting surface 1121 of the first sector-shaped convex step 1120 on the lower cam ring 112 will rotate relative to the second fitting surface of the second sector-shaped convex step 1020 on the upper cam ring 102. Thus, through the rotation of the first sector-shaped convex step 1120 relative to the second sector-shaped convex step 1020, and based on the spring 13 clamped between the receiving cylinder body 10 and the upper joint 12, the receiving cylinder body 10 can vibrate up and down relative to the central screw rod 11. Also, since barbs 101 that extend obliquely upward, i.e., toward the top of the receiving cylinder body, are provided on the inner wall of the receiving cylinder body 10, during the up-and-down vibration of the receiving cylinder body 10, the cable can be lifted upward by the barbs 101 on the inner wall of the receiving cylinder body, thereby further improving the efficiency of salvaging the cable.

[0046] Specifically, in this embodiment, the top of the central screw rod 11 is fixedly welded to the lower cam ring 112, and the top of the receiving cylinder body 10 is also fixedly welded to the upper cam ring 102. Specifically, the top of the central screw rod 11 is rotationally connected to the top of the receiving cylinder body 10 through a bearing, and the bearing is arranged on the upper cam ring 102.

[0047] In summary, the downhole cable salvage device of the present utility model can improve the efficiency of salvaging downhole cables, and has a simple structure and convenient operation. Therefore, the present utility model effectively overcomes various drawbacks in the prior art and has high industrial utilization value.

[0048] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A downhole cable salvage device, characterized in that: include: Storage cylinder; A central spiral rod, wherein a convex thread is provided on the surface of the central spiral rod, wherein the convex thread spirally extends from the bottom end of the central spiral rod to the top end of the central spiral rod, wherein the central spiral rod is inserted into the interior of the storage cylinder, wherein the top of the central spiral rod protrudes from the top end of the storage cylinder and is rotatably connected to the top end of the storage cylinder, and the bottom of the central spiral rod protrudes from the bottom end of the storage cylinder, and the bottom end of the storage cylinder is open; An upper joint, wherein a first end of the upper joint is connected to the top of the central spiral rod, and a second end of the upper joint is used to be connected to a salvage pipe string.

2. A downhole cable salvage device according to claim 1, characterized in that: The bottom end of the central spiral rod is provided with a conical head.

3. A downhole cable salvage device according to claim 1 or 2, characterized in that: The pitch of the convex thread gradually increases from the bottom end of the central spiral rod to the top end of the central spiral rod.

4. A downhole cable salvage device according to claim 1, characterized in that: The inner wall of the storage cylinder is provided with barbs, and the barbs extend obliquely upward.

5. A downhole cable salvage device according to claim 4, characterized in that: A lower cam ring is fixedly provided on the top of the central spiral rod, an upper cam ring is fixedly provided on the top of the storage cylinder, and a spring is clamped between the top of the storage cylinder and the first end of the upper joint, wherein a plurality of first fan-shaped convex steps are provided on the lower cam ring along the circumferential direction of the lower cam ring, the top surface of each of the first fan-shaped convex steps is a first fitting surface, and along the first circumferential direction of the lower cam ring, the distance between each of the first fitting surfaces and the bottom of the lower cam ring gradually decreases; a plurality of second fan-shaped convex steps are provided on the upper cam ring along the circumferential direction of the upper cam ring, the bottom surface of each of the second fan-shaped convex steps is a second fitting surface, and along the first circumferential direction of the upper cam ring, the distance between each of the second fitting surfaces and the top of the upper cam ring gradually increases, the first fitting surface is fitted with the second fitting surface, and the first circumferential direction of the lower cam ring is the same as the first circumferential direction of the upper cam ring.

6. A downhole cable salvage device according to claim 5, characterized in that: The top of the central spiral rod is welded and fixed to the lower cam ring, and the top of the storage cylinder is welded and fixed to the upper cam ring.

7. A downhole cable fishing device according to claim 1, characterized in that: The top of the central spiral rod is threadedly connected to the first end of the upper joint.

8. A downhole cable salvage device according to claim 1, characterized in that: The second end of the upper joint is provided with an internal thread.

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