Fish fishing tool

Abstract

The utility model discloses a fish fishing tool, and belongs to the technical field of fishing tools. Comprising an upper connector, a barrel body, a guide shoe, an inner conical barrel and an expansion ring, the barrel body is detachably composed of an upper barrel and a lower barrel, and a limiting protruding ring is coaxially arranged on the lower portion in the upper barrel; the inner conical cylinder is coaxially arranged in the cylinder body, can slide downwards along the cylinder body and is located at the joint of the upper cylinder and the lower cylinder, the upper side of the inner conical cylinder abuts against the lower side of the limiting convex ring, the lower portion of the inner conical cylinder can contract inwards, a big-end-down conical hole is coaxially formed in the lower end of a center hole of the inner conical cylinder, and barbs matched with the conical hole are arranged in the center hole and located at the upper end of the conical hole; the inner diameter of the lower part of the lower cylinder is gradually reduced from top to bottom to form a conical hole structure; the conical hole structure is positioned below the inner conical cylinder; the expansion ring is glued in the inner conical cylinder, is used for tensioning and fixing the inner conical cylinder on the cylinder body, and can be upwards ejected out of the inner conical cylinder by a fish; when the barrel body moves upwards, the barbs are hooked on a fish, the inner conical barrel slides downwards along the conical hole structure, and the lower portion of the inner conical barrel tightly holds the fish.

Description

Technical Field

[0001] This utility model belongs to the field of fishing tool technology, and specifically relates to a fish retrieval tool suitable for retrieval of large fish. Background Technology

[0002] During oil and gas field development or exploration, drilling tools such as drill bits or drill strings are used to operate inside the casing. However, these tools may break and fall to the bottom of the well, becoming what are known as "fish at the bottom of the well." Retrieval tools are then needed to retrieve these fallen fish.

[0003] For example, patent application number CN201911183108.8 discloses a powerful fish-catching and retrieval tube, including an upper connector, a tube body, and a guide shoe. The upper end of the upper connector has a stepped connector buckle formed on its inner side. The lower end of the upper connector is threaded to the tube body. The lower end of the tube body is threaded to the guide shoe. The tube body has a conical inner hole. An A-shaped packing is fixed to the top of the upper connector. A fine-adjustment spring is provided in the A-shaped packing. A slip limit seat is provided at the lower end of the fine-adjustment spring. A retrieval slip is threaded below the slip limit seat. The inner wall of the retrieval slip has serrated threads. A lower limit ring is embedded in the lower end of the tube body. A groove is formed on the inner circle of the lower limit ring. An R-shaped packing is embedded in the groove. An O-ring is fixed in the space between the lower end of the lower limit ring and the upper end of the guide shoe.

[0004] For example, patent application number CN201420658516.0 discloses a special fishing tube for continuous tubing, including a mandrel, an upper connector, an outer sleeve connector, an outer sleeve, slips, and a slip cone sleeve. The upper connector is threaded onto one end of the mandrel, and a limiting boss is provided at the other end of the mandrel. The outer sleeve connector and the outer sleeve are fitted onto the mandrel, and a guide shoe is threaded onto the end of the outer sleeve. A slip is installed on one end of the mandrel inside the outer sleeve through a compression spring and a thrust bearing. A slip cone sleeve is installed inside the outer sleeve on one side of the slip. One end of the slip cone sleeve is fitted onto the slip. A guide fork is installed on the slip. A slip through groove is provided on the slip, and a cone sleeve through groove is provided on the slip cone sleeve. The guide fork is in contact with the slip and the slip cone sleeve through the slip through groove and the cone sleeve through groove, respectively.

[0005] For example, patent application number CN201510985363.X discloses a double-release sliding sleeve type retrieval cylinder, including a mandrel; a throttling nozzle is provided in the bottom hole of the mandrel; a sliding sleeve is fitted on the bottom of the mandrel, the internal thread of the bottom hole of the sliding sleeve is connected to the external thread of the bottom of the mandrel, and the external thread of the bottom of the sliding sleeve is connected to the internal thread of the top opening of the retrieval cylinder; a cylinder body is fitted on the outer sleeve, and a milling head is provided at the bottom of the cylinder body; the internal thread of the top opening of the cylinder body is connected to the external thread of the upper connector; a spring is fitted on the mandrel between the sliding sleeve and the upper connector, and a bearing is provided between the bottom end of the spring and the sliding sleeve; a groove is provided on the outer circular surface of the sliding sleeve, and a pin is provided on the cylinder body, with one end of the pin located in the groove.

[0006] Existing fish retrieval tools have complex structures and typically rely on slips to hold the fish in place. In some scenarios, such as when the fish is large and the wellbore diameter is small, resulting in a small gap between the fish and the wellbore annulus, complex retrieval tools become difficult to use. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a fish-catching tool that has advantages such as simple structure and good catching effect. The technical solution is as follows:

[0008] This utility model provides a fish-catching tool, comprising an upper connector 1, a cylindrical body 2, and a guide shoe 3 arranged sequentially from top to bottom. The cylindrical body 2 is vertically arranged. The tool also includes an inner conical cylinder 4 and an expansion ring 5 within it. The cylindrical body 2 is detachably composed of an upper cylinder 21 and a lower cylinder 22 from top to bottom. A limiting protrusion ring 6 is coaxially provided in the lower part of the upper cylinder 21. The inner conical cylinder 4 is coaxially disposed inside the cylindrical body 2 and can slide downward along the cylindrical body 2. It is located at the connection between the upper cylinder 21 and the lower cylinder 22, with its upper side abutting against the lower side of the limiting protrusion ring 6. Its lower part can retract inward. The lower end of the central hole is coaxially provided with a conical hole 41 that is larger at the bottom and smaller at the top. Inside the central hole and at the upper end of the conical hole 41, there is a barb 42 that mates with the conical hole 41. The inner diameter of the lower part of the lower cylinder 22 gradually decreases from top to bottom to form a conical hole structure. The conical hole structure is located below the inner conical cylinder 4. The expansion ring 5 is glued inside the inner conical cylinder 4. It is used to tighten and fix the inner conical cylinder 4 to the cylinder body 2. It can be pushed upward by the fish falling into the inner conical cylinder 4. When the cylinder body 2 moves upward, the barb 42 hooks onto the fish falling into the cylinder. The inner conical cylinder 4 slides downward along the conical hole structure and its lower part hugs the fish falling into the cylinder.

[0009] In this embodiment of the present invention, the upper connector 1 is coaxially disposed at the upper end of the upper cylinder 21, the guide shoe 3 is coaxially disposed at the lower end of the lower cylinder 22, the upper cylinder 21 and the lower cylinder 22 are coaxially disposed and connected by threads, the expansion ring 5 is coaxially disposed with the inner cone cylinder 4, and the inner diameter of the limiting protrusion ring 6 is smaller than the outer diameter of the inner cone cylinder 4.

[0010] Preferably, in this embodiment of the present invention, the inner diameter of the shoe 3 gradually decreases from bottom to top, its lower end is horseshoe-shaped, its lower end is provided with a blade, and its upper end has an inner diameter greater than the inner diameter of the inner cone 4.

[0011] In this embodiment of the present invention, the lower cylinder 22 consists of a connecting section, a straight pipe section, and a tapered pipe section from top to bottom. The connecting section is detachably connected to the upper cylinder 21. The inner tapered cylinder 4 is coaxially disposed inside the straight pipe section. The inner diameter of the tapered pipe section gradually decreases from top to bottom to form a tapered hole structure, and the inner diameter of its lower end is the same as the inner diameter of the upper end of the guide shoe 3.

[0012] Specifically, in this embodiment of the invention, the taper of the inner wall of the tapered tube section is 2-5°.

[0013] In one embodiment of this patent, the outer wall of the inner conical cylinder 4 is fitted with the inner wall of the straight pipe section with a clearance, and multiple contraction openings are evenly distributed around the axis at its lower part; the contraction openings are arranged vertically, located below the expansion ring 5, and are either strip-shaped or angular openings that are smaller at the top and larger at the bottom.

[0014] In another embodiment of this patent, the lower part of the inner cone 4 is capable of flexible deformation.

[0015] Preferably, in this embodiment of the present invention, the upper part of the center hole of the inner conical cylinder 4 is a smooth surface, and the lower part of the center hole is a rough surface; the expansion ring 5 is located at the top of the rough surface.

[0016] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This utility model embodiment provides a fish retrieval tool, which has the advantages of simple structure and good retrieval effect. It is especially suitable for retrieval of large fish (with a small difference between the fish's diameter and the well's inner diameter). Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the fish retrieval tool in this embodiment of the utility model;

[0018] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0019] Figure 3 This is a schematic diagram of the structure of the inner cone and the expansion ring combination;

[0020] Figure 4 This is a schematic diagram of the structure of the bottom of the inner cone cylinder disclosed in Example 2.

[0021] In the diagram: 1. Upper connector, 2. Cylinder body, 3. Guide shoe, 4. Inner cone, 5. Expansion ring, 6. Limiting protrusion ring;

[0022] 21 Upper cylinder, 22 Lower cylinder;

[0023] 41. Tapered hole; 42. Barb. Detailed Implementation

[0024] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] See Figure 1-3 Example 1 provides a fish-catching tool, including an upper connector 1, a cylindrical body 2, a guide shoe 3, an inner conical cylinder 4, and an expansion ring 5. The cylindrical body 2 is vertically arranged and has a cylindrical structure, detachably composed of an upper cylinder 21 and a lower cylinder 22 from top to bottom. Specifically, the upper cylinder 21 and the lower cylinder 22 are coaxially arranged and connected by threads, with the lower inner wall of the upper cylinder 21 flush with the upper inner wall of the lower cylinder 22. A limiting protrusion 6 is coaxially provided in the lower part of the upper cylinder 21, and the inner diameter of the limiting protrusion 6 is smaller than the outer diameter of the inner conical cylinder 4. The upper connector 1, the cylindrical body 2, and the guide shoe 3 are arranged sequentially from top to bottom, and the structures of the upper connector 1 and the guide shoe 3 are consistent with existing technology. Specifically, the upper connector 1 is coaxially located at the upper end of the upper cylinder 21. The guide shoe 3 is coaxially located at the lower end of the lower cylinder 22, and its inner diameter gradually decreases from bottom to top to form a conical hole, with the inner diameter at its upper end being larger than the inner diameter of the inner conical cylinder 4.

[0027] The inner conical cylinder 4 is coaxially disposed inside the cylinder body 2. It is a cylindrical structure with a clearance fit or a small gap with the cylinder body 2, allowing it to slide downwards along the cylinder body 2. It is located at the connection between the upper cylinder 21 and the lower cylinder 22 (specifically in the lower middle part of the cylinder body 2). Its upper side abuts against the lower side of the limiting protrusion ring 6, and its lower part can retract inwards. The lower end of its central hole is coaxially provided with a conical hole 41 that is larger at the bottom and smaller at the top to facilitate the entry of fish. Inside the central hole and at the upper end of the conical hole 41, there is a barb 42 that mates with the conical hole 41 (set along the conical surface of the conical hole 41) to hook and fix the inner conical cylinder 4 onto the fish. The inner diameter of the lower part of the lower cylinder 22 gradually decreases from top to bottom to form a conical hole structure, which is located below the inner conical cylinder 4. The expansion ring 5 is coaxially arranged with the inner cone 4 and is glued inside the inner cone 4 (for easy separation under stress). It is used to tighten and fix the inner cone 4 to the cylinder 2 to prevent the inner cone 4 from falling downwards when the tool is lowered. It can be pushed upwards by the fish. When the cylinder 2 moves upwards, the barb 42 hooks onto the fish, and the inner cone 4 slides downwards along the cone hole structure, with its lower part holding the fish tightly.

[0028] In this embodiment of the invention, the lower cylinder 22 consists of a connecting section, a straight pipe section, and a tapered pipe section from top to bottom. The connecting section (specifically, a threaded sleeve (with internal threads) coaxially arranged with the cylinder body 2; correspondingly, the lower end of the upper cylinder 21 is coaxially provided with an external threaded connector that mates with the threaded sleeve) is detachably connected to the upper cylinder 21. The inner tapered cylinder 4 is coaxially arranged inside the straight pipe section. The inner diameter of the tapered pipe section gradually decreases from top to bottom, forming a tapered hole structure, and the inner diameter of its lower end is the same as the inner diameter of the upper end of the guide shoe 3. Specifically, the taper of the inner wall of the tapered pipe section is 2-5°.

[0029] Example 2

[0030] See Figure 2 Example 2 provides a fish-catching tool, whose structure is basically the same as that of Example 1, except that: in this embodiment, the outer wall of the inner cone 4 is fitted with the inner wall of the straight pipe section with a clearance, and multiple (specifically 3-6) contraction openings are evenly distributed around the axis at its lower part. The contraction openings are vertically arranged and located below the expansion ring 5. They are strip-shaped openings or angular openings that are smaller at the top and larger at the bottom, and their width (to ensure that the fish can be locked in place) is 0.5-2.0 mm.

[0031] Example 3

[0032] Example 3 provides a fish-catching tool, the structure of which is basically the same as that of Example 1, except that the lower part of the inner cone 4 in this embodiment of the invention can be flexibly deformed (e.g., it has elasticity). Specifically, the wall thickness of the inner cone 4 is relatively thin.

[0033] Example 4

[0034] See Figure 1 Example 4 provides a fish-catching tool, whose structure is basically the same as that of Example 1, except that the lower end of the guide shoe 3 in this embodiment is horseshoe-shaped and has a blade. This structure is used to handle situations where there are cables near the fallen fish; rotating it cuts the cable.

[0035] Example 5

[0036] Example 5 provides a fish-catching tool, whose structure is basically the same as that of Example 1, except that: the upper part of the central hole of the inner cone 4 in this embodiment is a smooth surface, and the lower part of the central hole is a rough surface, so that the expansion ring 5 can be pushed upward. The expansion ring 5 is located at the top of the rough surface.

[0037] Example 6

[0038] Example 6 provides a procedure for using a fish retrieval tool, employing the tool disclosed in Example 1. The procedure is as follows: The diameter of the broken section of the fish in this embodiment is 130mm, specifically an electric submersible pump unit, assumed to be in a free state, with a weight less than 1t. The wellbore has an inner diameter of 152.4mm and a stable structure (specifically, a limestone layer). The guide shoe 3 first cuts away debris around the fish, guiding it into the cylinder 2. As the fish continues upward, it pushes out the expansion ring 5. The lower part of the inner cone 4, held in place by the limiting protrusion ring 6, contracts and tightly grips the fish. As the cylinder 2 moves upward, the inner cone 4 descends along the tapered surface of the lower cylinder 22, gradually decreasing in diameter, and gradually grips the fish, thus achieving retrieval. After retrieval, the upper cylinder 21 and lower cylinder 22 are separated to remove the inner cone 4 or to separate the inner cone 4 from the fish.

[0039] Through repeated ground tests and four downhole retrieval attempts, the fish were successfully retrieved, and the inner cone 4 held the fish tightly.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fishing tool for fallen fish, comprising, from top to bottom, an upper joint (1), a barrel (2) and a guide shoe (3), wherein the barrel (2) is vertically arranged, characterized in that the fishing tool further comprises an inner tapered barrel (4) and an expansion ring (5) inside the inner tapered barrel (4), the barrel (2) is detachably composed of an upper barrel (21) and a lower barrel (22) from top to bottom, a limiting convex ring (6) is coaxially arranged in the lower part of the upper barrel (21), the inner tapered barrel (4) is coaxially arranged in the barrel (2) and can slide downward along the barrel (2), the inner tapered barrel (4) is located at the joint of the upper barrel (21) and the lower barrel (22), the upper side of the inner tapered barrel (4) abuts against the lower side of the limiting convex ring (6), and the lower part of the inner tapered barrel (4) can be inwardly contracted, a tapered hole (41) with a large lower part and a small upper part is coaxially arranged at the lower end of the central hole of the inner tapered barrel (4), and a barb (42) matched with the tapered hole (41) is arranged in the central hole of the inner tapered barrel (4) and located at the upper end of the tapered hole (41), the inner diameter of the lower part of the lower barrel (22) gradually decreases from top to bottom to form a tapered hole structure, and the tapered hole structure is located below the inner tapered barrel (4), the expansion ring (5) is glued in the inner tapered barrel (4) and is used for tightly fixing the inner tapered barrel (4) on the barrel (2), and the expansion ring (5) can be pushed out of the inner tapered barrel (4) by the fallen fish, when the barrel (2) moves upward, the barb (42) is hooked on the fallen fish, and the inner tapered barrel (4) slides downward along the tapered hole structure and tightly holds the fallen fish. The upper joint (1) is coaxially arranged at the upper end of the upper barrel (21), the guide shoe (3) is coaxially arranged at the lower end of the lower barrel (22), the upper barrel (21) and the lower barrel (22) are coaxially arranged and connected through threads, the expansion ring (5) is coaxially arranged with the inner tapered barrel (4), and the inner diameter of the limiting convex ring (6) is smaller than the outer diameter of the inner tapered barrel (4).

2. The fish-falling tool according to claim 1, characterized in that The inner diameter of the guide shoe (3) gradually decreases from bottom to top, the lower end of the guide shoe (3) is in the shape of a horse's hoof, a cutting edge is arranged at the lower end of the guide shoe (3), and the inner diameter of the upper end of the guide shoe (3) is larger than the inner diameter of the inner tapered barrel (4).

3. A fish-falling tool according to claim 2, characterised in that The lower barrel (22) comprises, from top to bottom, a connecting section, a straight pipe section and a tapered pipe section, the connecting section is detachably connected with the upper barrel (21), the inner tapered barrel (4) is coaxially arranged in the straight pipe section, and the inner diameter of the tapered pipe section gradually decreases from top to bottom to form a tapered hole structure, and the inner diameter of the lower end of the tapered pipe section is the same as the inner diameter of the upper end of the guide shoe (3).

4. A fish-falling tool according to claim 3, characterised in that The taper of the inner wall of the tapered pipe section is 2-5°.

5. A fish-falling tool according to claim 4, wherein, The outer wall of the inner tapered barrel (4) is gap-fitted with the inner wall of the straight pipe section, and a plurality of contraction openings are uniformly distributed around the axis of the lower part of the inner tapered barrel (4), the contraction openings are vertically arranged and located below the expansion ring (5), and the contraction openings are in the shape of a strip or an angle with a small upper part and a large lower part.

6. The fish-falling tool according to claim 4, characterized in that The lower part of the inner tapered barrel (4) can be flexibly deformed.

7. The fish-falling tool according to claim 1, characterized in that The upper part of the central hole of the inner tapered barrel (4) is a smooth surface, the lower part of the central hole of the inner tapered barrel (4) is a rough surface, and the expansion ring (5) is located at the top end of the rough surface.

8. The fish-falling tool according to claim 1, characterized in that ​

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