Multi-claw type fish fishing tool

Abstract

The invention relates to the technical field of fish fishing devices, in particular to a multi-claw type fish fishing tool which comprises an upper connector, a pin pressing cylinder, a positioning cylinder, a sleeve, an adapter cylinder and a fishing cylinder. The outer side of the lower end of the upper connector is in threaded connection with the pin pressing cylinder, the inner side of the lower end of the upper connector is in threaded connection with the sleeve, and a first limiting inner ring table is arranged in the middle of the upper connector; and a positioning cylinder of which the lower part is positioned in the sleeve is arranged in the upper joint corresponding to the lower side position of the first limiting inner ring table. The fishing device is reasonable and compact in structure and convenient to use, is not provided with a guide shoe, can complete fishing operation under the working condition of a short fish head, can go deep into a hole of a fish by arranging the fishing claw and the fishing table to hang the fish so as to lift the fish, has the remarkable advantages of being simple in process, short in processing time and low in production cost, and is convenient to mount and dismount and low in maintenance cost.

Description

Technical Field

[0001] The invention relates to the technical field of fallen fish salvaging devices, in particular to a multi-claw type fallen fish salvaging tool. Background Art

[0002] With the rapid development of oilfield development technology in my country, various well repair tools have also developed rapidly. Problems often occur during the development process. During the normal development of oil and water wells, various well tools need to be put into the well for well repair operations.

[0003] During the construction, drill bit sticking, sand buried pipe, acid attack and fracture of tools may occur, which may easily lead to the complicated situation of tool falling off. At this time, it is necessary to salvage the tools in the well to restore the production capacity of the oil and water wells. At present, the tools in the well are generally salvaged with a slip salvage tube. This salvage tool can hold the conventional fish, but this salvage tube cannot hold the short fish head and the hardness of the slip due to the long guide shoe and insufficient slip. At the same time, due to the unique shape and structure of the fallen object, the slip salvage tube cannot hold it firmly, resulting in salvage failure. Repeated salvage is required, which increases the workload of salvage and the cost of restoring oil and water well production.

[0004] In recent years, the switch sleeve fracturing technology has developed rapidly. During the construction of the sliding sleeve fracturing, due to the serious deformation of the casing in the construction layer and the serious acid corrosion of the packer thread, the packer may fall into the well during the lifting of the sliding sleeve fracturing tool string. In addition, there are difficulties in the packer fish falling, such as the short fish head and the slips cannot be held tightly, which easily leads to the failure of conventional slip salvage. Summary of the invention

[0005] The present invention provides a multi-claw fish salvage tool, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the existing fish salvage device has a short fish head and is difficult to salvage, has a high salvage failure rate and requires multiple salvage attempts, resulting in a large workload.

[0006] The technical solution of the present invention is achieved through the following measures: a multi-claw fish salvage tool, including an upper joint, a pinning cylinder, a positioning cylinder, a sleeve, an adapter cylinder, and a salvage cylinder. The outer side of the lower end of the upper joint is threadedly connected to the pinning cylinder, the inner side of the lower end of the upper joint is threadedly connected to the sleeve, a first limiting inner ring platform is provided in the middle of the upper joint, a positioning cylinder corresponding to the lower side of the first limiting inner ring platform is provided in the upper joint, the lower end of the positioning cylinder is threadedly connected to an adapter cylinder whose upper end abuts against the lower end of the sleeve, the outer side of the lower end of the adapter cylinder is threadedly connected to the salvage cylinder, a plurality of salvage claws are integrally arranged at the lower end of the salvage claws, the inner sides of the lower ends of the salvage claws are provided with salvage platforms protruding inward, the sleeve, the adapter cylinder, and the salvage cylinder are all located in the pinning cylinder.

[0007] The following are further optimizations and / or improvements to the above technical solutions: A positioning outer ring platform may be provided on the outer side of the upper end of the positioning tube, and a cavity is provided between the lower side of the positioning outer ring platform and the upper end of the sleeve. The upper part of the positioning tube is fixedly installed with the upper joint through a shear pin, and a conical surface with a larger inner diameter at the upper part and a smaller inner diameter at the lower part is integrally provided on the inner side of the lower part of the pressing pin tube corresponding to the outer side of the lower end of the salvage claw.

[0008] The above may also include a ratchet ring, a second limiting inner ring platform is provided on the inner side of the middle part of the adapter tube, a ratchet ring is provided on the inner side of the lower end of the adapter tube, and inverted teeth are provided inside the ratchet ring. The upper end of the ratchet ring is abutted against the lower side of the second limiting inner ring platform, and the inner diameter of the second limiting inner ring platform is greater than or equal to the inner diameter of the ratchet ring.

[0009] A third position-limiting inner ring platform may be provided on the inner side of the adapter tube corresponding to the upper end position of the second position-limiting inner ring platform, and the inner diameter of the second position-limiting inner ring platform is greater than that of the third position-limiting inner ring platform.

[0010] The above-mentioned may also include a wedge ring, and a supporting inner ring platform is provided on the inner side of the salvage tube corresponding to the lower end position of the adapter tube, and a wedge ring is seated on the supporting inner ring platform. The inner diameter of the wedge ring is larger at the upper end and smaller at the lower end. A plurality of cutting grooves penetrating inside and outside are provided at the lower part of the ratchet ring, and the outer side of the lower end of the ratchet ring is located on the inner side of the upper part of the wedge ring. The wedge-shaped structure inside the wedge ring can tighten the lower part of the ratchet ring.

[0011] The lower end of the overshot tube may be integrally provided with five overshot claws.

[0012] The present invention has a reasonable and compact structure and is easy to use. It does not have a guide shoe and can complete the salvage operation under the condition of a short fish head. By arranging a salvage claw and a salvage platform, it can penetrate into the hole where the fish falls and hang the fish, thereby lifting the fish. It has the significant advantages of simple procedure, short processing time and low production cost, and is easy to install and disassemble, and has low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 This is a schematic diagram of the front cross-sectional structure of Example 1 of the present invention.

[0014] The codes in the accompanying drawings are: 1 is the upper joint, 2 is the pressing pin cylinder, 3 is the positioning cylinder, 4 is the sleeve, 5 is the adapter cylinder, 6 is the salvage cylinder, 7 is the first limiting inner ring platform, 8 is the salvage claw, 9 is the salvage platform, 10 is the positioning outer ring platform, 11 is the shear pin, 12 is the cone surface, 13 is the ratchet ring, 14 is the second limiting inner ring platform, 15 is the third limiting inner ring platform, 16 is the wedge ring, and 17 is the supporting inner ring platform. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 As shown, the multi-claw fish salvage tool includes an upper joint 1, a pinning cylinder 2, a positioning cylinder 3, a sleeve 4, an adapter cylinder 5, and a salvage cylinder 6. The outer side of the lower end of the upper joint 1 is threadedly connected to the pinning cylinder 2, and the inner side of the lower end of the upper joint 1 is threadedly connected to the sleeve 4. A first limiting inner ring platform 7 is provided in the middle of the upper joint 1. A positioning cylinder 3 corresponding to the lower side position of the first limiting inner ring platform 7 is provided in the upper joint 1. The lower end of the positioning cylinder 3 is threadedly connected to an adapter cylinder 5 whose upper end abuts against the lower end of the sleeve 4. The lower end of the adapter cylinder 5 is threadedly connected to a salvage cylinder 6. A plurality of salvage claws 8 are integrally arranged at the lower end of the salvage claws 8. The inner sides of the lower ends of the salvage claws 8 are provided with salvage platforms 9 protruding inwardly. The sleeve 4, the adapter cylinder 5, and the salvage cylinder 6 are all located in the pinning cylinder 2.

[0018] According to the requirements, the fishing claw 8 can be made of a high-strength, high-elasticity, and high-hardness material to ensure that a larger load can be caught on a shallower step.

[0019] The use process is as follows: the continuous oil pipe is connected to the upper joint 1 and brought into the well by the present invention, and then lowered to a position 50m above the fallen fish. The pump circulation is started near the position of the fish head, and sand is flushed out if there is any to ensure that the wellbore is clean, so as to create a good wellbore environment for subsequent salvage operations. When the salvage tube 6 is close to the top of the fish, it is slowly lowered to observe the changes in the hanging weight and the pump pressure, so that the fallen fish can accurately enter the salvage tube 6. After the fallen fish completely enters the salvage tube 6, the channel of the positioning tube 3 is blocked, and the ground shows that the pump pressure rises. The pipe column is rotated to make the salvage tube 6 rotate in the same direction, so that the multiple salvage claws 8 of the salvage tube 6 are respectively stuck in the holes of the fallen fish, and the continuous oil pipe is lifted to observe the change of the hanging weight. If there is an obstacle of 2-3 tons, it is lifted. If there is no change, the lifting and lowering actions are repeated until the hanging weight increases.

[0020] The present invention solves the problem of salvaging packers in casings of complex wells, overcomes the problem that the 6 slips of the traditional salvage tube cannot be gripped tightly and cannot salvage fallen objects with short fish heads. The present invention is easy to use, can greatly improve the success rate of salvage, and can complete the salvage operation under the condition of short fish heads. It has the significant advantages of simple procedure, short processing time and low production cost. The fallen fish can be lifted out by large-tonnage hard lifting in the vertical well section micro-casing position change. The operation of the present invention is equivalent to a flushing + salvage tool, and the wellbore and the fish top can be flushed first and then the salvage operation can be carried out.

[0021] The above-mentioned multi-claw fish catching tool can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1As shown, a positioning outer ring stage 10 is provided on the outer side of the upper end of the positioning cylinder 3, and a cavity is provided between the lower side of the positioning outer ring stage 10 and the upper end of the sleeve 4. The upper part of the positioning cylinder 3 is fixedly installed with the upper joint 1 through a shear pin 11, and a conical surface 12 with a larger inner diameter at the upper part and a smaller inner diameter at the lower part is integrally provided on the inner side of the lower part of the pressing pin cylinder 2 corresponding to the outer side of the lower end of the salvage claw 8.

[0022] After the salvage platform 9 of the salvage claw 8 bites the hole of the fallen fish, the shear pin 11 is sheared off under the gravity of the fallen fish when the pipe column is lifted, and the positioning tube 3, the adapter tube 5, and the salvage tube 6 slide downward relative to the pressing pin tube 2. The outer side of the salvage claw 8 contacts the conical surface 12 in the pressing pin tube 2, thereby pushing the salvage claw 8 to retract inward, further grasping the fallen fish to prevent the fallen fish from falling, and the positioning outer ring platform 10 is hung on the sleeve 4 to limit the downward position of the salvage claw 8 to avoid excessive squeezing.

[0023] Embodiment 3: As attached Figure 1 As shown, it also includes a ratchet ring 13, a second limiting inner ring platform 14 is provided on the inner side of the middle part of the adapter tube 5, a ratchet ring 13 is provided on the inner side of the lower end of the adapter tube 5, and a reverse tooth is provided inside the ratchet ring 13, and the upper end of the ratchet ring 13 abuts against the lower side of the second limiting inner ring platform 14, and the inner diameter of the second limiting inner ring platform 14 is greater than or equal to the inner diameter of the ratchet ring 13. The pitch of the reverse tooth is the same as the fish falling thread, and the tooth shape is a reverse tooth structure, which can only go in but not disengage, thereby further pulling the fallen fish and improving the success rate of fish salvage.

[0024] Embodiment 4: As attached Figure 1 As shown, a third limiting inner ring platform 15 is provided inside the adapter tube 5 corresponding to the upper end position of the second limiting inner ring platform 14, and the inner diameter of the second limiting inner ring platform 14 is larger than the third limiting inner ring platform 15. The third limiting inner ring platform 15 is provided to limit the upper end position of the fish entering the device, thereby avoiding excessive squeezing of the positioning tube 3 and ensuring that the shear pin 11 is cut off normally, so that the conical surface 12 pushes the fishing claw 8 to grab the fish.

[0025] Embodiment 5: As attached Figure 1 As shown, it also includes a wedge ring 16. A supporting inner ring platform 17 is provided on the inner side of the salvage tube 6 corresponding to the lower end of the adapter tube 5. The wedge ring 16 is seated on the supporting inner ring platform 17. The inner diameter of the upper end of the wedge ring 16 is larger than that of the lower end. A plurality of cutting grooves that penetrate inside and outside are provided at the lower part of the ratchet ring 13. The outer side of the lower end of the ratchet ring 13 is located on the inner side of the upper part of the wedge ring 16. The wedge structure inside the wedge ring 16 can tighten the lower part of the ratchet ring 13.

[0026] When in use, the ratchet ring 13 has a cutting groove to facilitate the release of the fallen fish, and is therefore elastic. Therefore, a wedge ring 16 is provided to clamp the lower part of the ratchet ring 13. When the ratchet ring 13 is locked with the fallen fish, the fallen fish will pull the ratchet ring 13 downward under the action of gravity, so that the wedge ring 16 will hold the ratchet ring 13 tightly, further fixing the fallen fish and ensuring its stable salvage.

[0027] Embodiment 6: As attached Figure 1 As shown, five fishing claws 8 are integrally provided at the lower end of the overshot tube 6. The number of fishing claws 8 is set according to the form of the packer or other fish dropping.

[0028] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A multi-claw fish catching tool, characterized in that It includes an upper joint, a pinning cylinder, a positioning cylinder, a sleeve, an adapter cylinder and a salvage cylinder. The outer side of the lower end of the upper joint is threadedly connected to the pinning cylinder, the inner side of the lower end of the upper joint is threadedly connected to the sleeve, a first limiting inner ring platform is provided in the middle of the upper joint, a positioning cylinder located at the lower part of the sleeve is provided in the upper joint corresponding to the lower side of the first limiting inner ring platform, a adapter cylinder with its upper end abutting against the lower end of the sleeve is threadedly connected to the outer side of the lower end of the positioning cylinder, a salvage cylinder is threadedly connected to the outer side of the lower end of the adapter cylinder, a plurality of salvage claws are integrally arranged at the lower end of the salvage claws, the inner sides of the lower ends of the salvage claws are provided with salvage platforms protruding inwards, the sleeve, adapter cylinder and salvage cylinder are all located in the pinning cylinder.

2. The multi-claw fish catching tool according to claim 1, characterized in that A positioning outer ring platform is provided on the outer side of the upper end of the positioning tube, and a cavity is provided between the lower side of the positioning outer ring platform and the upper end of the sleeve. The upper part of the positioning tube is fixedly installed with the upper joint through a shear pin, and a conical surface with a larger inner diameter at the upper part and a smaller inner diameter at the lower part is integrally provided on the inner side of the lower part of the pressing pin tube corresponding to the outer side of the lower end of the salvage claw.

3. The multi-claw fish catching tool according to claim 1 or 2, characterized in that It also includes a ratchet ring, a second limiting inner ring platform is provided on the inner side of the middle part of the adapter tube, a ratchet ring is provided on the inner side of the lower end of the adapter tube, and inverted teeth are provided in the ratchet ring. The upper end of the ratchet ring is abutted against the lower side of the second limiting inner ring platform, and the inner diameter of the second limiting inner ring platform is greater than or equal to the inner diameter of the ratchet ring.

4. The multi-claw fish catching tool according to claim 3 is characterized in that A third limiting inner ring platform is provided on the inner side of the adapter tube corresponding to the upper end position of the second limiting inner ring platform, and the inner diameter of the second limiting inner ring platform is greater than that of the third limiting inner ring platform.

5. The multi-claw fish catching tool according to claim 3, characterized in that It also includes a wedge ring. A supporting inner ring platform is provided on the inner side of the salvage tube corresponding to the lower end of the adapter tube. A wedge ring is seated on the supporting inner ring platform. The inner diameter of the wedge ring is larger at the upper end and smaller at the lower end. A plurality of cutting grooves that penetrate inside and outside are provided at the lower part of the ratchet ring. The outer side of the lower end of the ratchet ring is located on the inner side of the upper part of the wedge ring. The wedge-shaped structure inside the wedge ring can tighten the lower part of the ratchet ring.

6. The multi-claw fish catching tool according to claim 4, characterized in that It also includes a wedge ring. A supporting inner ring platform is provided on the inner side of the salvage tube corresponding to the lower end of the adapter tube. A wedge ring is seated on the supporting inner ring platform. The inner diameter of the wedge ring is larger at the upper end and smaller at the lower end. A plurality of cutting grooves that penetrate inside and outside are provided at the lower part of the ratchet ring. The outer side of the lower end of the ratchet ring is located on the inner side of the upper part of the wedge ring. The wedge-shaped structure inside the wedge ring can tighten the lower part of the ratchet ring.

7. The multi-claw fish catching tool according to claim 1, 2, 4, 5 or 6, characterized in that Five salvage claws are integrally arranged at the lower end of the overshot tube.

8. The multi-claw fish catching tool according to claim 3, characterized in that Five salvage claws are integrally arranged at the lower end of the overshot tube.

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