Salvage tools

Abstract

The present invention relates to a salvage tool, and belongs to the technical field of oil and gas drilling equipment. In the salvage tool provided by the present invention, the elastic member enables the salvage portion of the opening block to always maintain a tendency to move away from the axis of the salvage spear. When the salvage tool passes through the diameter reduction section of the pipe string, the opening block is squeezed by the inner wall of the diameter reduction section, and the opening block contracts toward the axis of the salvage spear to reduce the outer diameter of the salvage tool, so that the salvage tool can pass through the diameter reduction section smoothly; after the salvage spear passes through the diameter reduction section, under the action of the elastic member, the straightening portion of the opening block rotates in a direction away from the axis of the salvage spear, the diameter of the salvage spear becomes larger, and the inner wall of the straightening portion of the salvage spear squeezes the fish near the well wall to the first opening of the salvage spear, so as to salvage the fish near the well wall.

Description

Technical Field

[0001] The invention relates to a fishing tool and belongs to the technical field of oil and gas drilling equipment. Background Art

[0002] In the field of oil and gas drilling equipment technology, small tubular and rod-shaped objects that fall into the well are generally called fallen fish. Fallen fish in the well will have an impact on subsequent oil production operations, and usually need to be salvaged using salvage tools.

[0003] Generally, it is necessary to use steel wire to lower the fishing tool to the bottom of the well to fish. The pipe string is often equipped with safety valves, fracturing valves, sleeves and other components, which form a smooth transition section with the pipe string. The inner diameter of these components is smaller than the inner diameter of the pipe string, forming a diameter reduction section. The outer diameter of conventional fishing tools is smaller than the inner diameter of the diameter reduction section, so that they can pass through the diameter reduction section smoothly.

[0004] However, after the salvage tool is lowered to the bottom of the well, it is located in the middle of the bottom of the well, and some fish are distributed close to the well wall. In this way, after the salvage tool passes the small-diameter end, it is difficult to salvage the fish near the well wall with a larger inner diameter of the pipe string. Summary of the invention

[0005] In view of the above-mentioned defects in the prior art, the present invention provides a fishing tool.

[0006] The salvaging tool provided by the present invention comprises a salvaging spear, wherein a receiving chamber is formed inside the salvaging spear, and a first opening is formed at one end of the salvaging spear for entering the fish, wherein the receiving chamber comprises a first chamber and a second chamber which are connected to each other, wherein the second chamber is connected to the first opening, wherein the inner diameter of the second chamber gradually increases along the axial direction of the salvaging spear toward the first opening, and an elastic salvaging hook is arranged on the connecting surface of the first chamber and the second chamber; and further comprises a plurality of opening blocks, wherein the opening block comprises a first connecting portion and a straightening portion, wherein the first connecting portion is located in the middle of the opening block, and the straightening portion is located at the lower end of the opening block, and an elastic member is arranged at one end of the receiving chamber away from the first opening, and a plurality of grooves are arranged at intervals on the outer peripheral wall of the salvaging spear, wherein the opening blocks correspond to the grooves one by one, the upper end of the opening block is connected to the elastic member, and the first connecting portion is hinged to the side wall of the groove; the plurality of straightening portions are located on the same conical surface, and the inner diameter of the conical surface gradually increases along the direction away from the first opening; and the inner diameter of the first opening is greater than or equal to the minimum inner diameter of the conical surface.

[0007] As one of the optional technical solutions of the present invention, the groove extends along the axial direction of the salvage spear, and the opening block is located inside the groove.

[0008] As one of the optional technical solutions of the present invention, the horizontal cross-section of the straightening portion is fan-shaped, and the sum of the central angles of a plurality of the straightening portions is 360 degrees.

[0009] As one of the optional technical solutions of the present invention, an end of the outer wall of the straightening portion away from the first opening forms an arc transition section with a gradually decreasing outer diameter.

[0010] As one of the optional technical solutions of the present invention, it also includes a limit member, which is arranged in the accommodating cavity, and the first end of the limit member is connected to the end of the accommodating cavity away from the first opening, and the upper end of the opening block can be abutted against the limit member to limit the rotation range of the opening block.

[0011] As one of the optional technical solutions of the present invention, the limiting member is a limiting rod, which extends along the axial direction of the salvage spear, and the end of the limiting rod away from the first opening is connected to the accommodating cavity, and the end of the limiting rod facing the first opening forms an outer flange, and the upper end of the opening block can be abutted against the outer flange.

[0012] As one of the optional technical solutions of the present invention, the elastic member is a torsion spring; a positioning rod is connected to the accommodating cavity, the torsion spring is sleeved on the positioning rod, and one end of the torsion spring is connected to the accommodating cavity, and the other end of the torsion spring is connected to the first connecting part.

[0013] As one of the optional technical solutions of the present invention, the elastic salvage hook extends from the inner wall of the salvage spear toward the axis of the salvage spear, and the elastic salvage hook is inclined in a direction away from the first opening.

[0014] As one of the optional technical solutions of the present invention, a first through hole is arranged on the side wall of the groove, a second through hole is arranged on the first connecting portion, and the second through hole is hinged to the first through hole via a pin shaft.

[0015] As one of the optional technical solutions of the present invention, a steel wire connection portion is formed at one end of the salvage spear away from the first opening.

[0016] The salvage tool provided by the present invention has an elastic member so that the salvage portion of the opening block always maintains a tendency to move away from the axis of the salvage spear. When the salvage tool passes through the diameter reduction section of the pipe string, the opening block is squeezed by the inner wall of the diameter reduction section, and the opening block contracts toward the axis of the salvage spear to reduce the outer diameter of the salvage tool, so that the salvage tool can smoothly pass through the diameter reduction section; after the salvage spear passes through the diameter reduction section, under the action of the elastic member, the straightening portion of the opening block rotates in a direction away from the axis of the salvage spear, the diameter of the salvage spear increases, and the inner wall of the straightening portion of the salvage spear squeezes the fish near the well wall to the first opening of the salvage spear, so as to salvage the fish near the well wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] Figure 1 A schematic diagram of the contracted state of the expansion block of the salvage tool provided in this embodiment;

[0019] Figure 2 A schematic diagram of the open state of the open block of the salvage tool provided in this embodiment;

[0020] Figure 3 A schematic diagram of the structure of a salvage spear of a salvage tool provided in this embodiment;

[0021] Figure 4 In this embodiment Figure 3 A cross-sectional view of the BB surface;

[0022] Figure 5 A schematic diagram of a first structure of an opening block of a salvage tool provided in this embodiment;

[0023] Figure 6 A second structural schematic diagram of the opening block of the salvage tool provided in this embodiment;

[0024] Figure 7 A third structural diagram of the expansion block of the salvage tool provided in this embodiment.

[0025] Description of reference numerals:

[0026] 1- Salvage Spear;

[0027] 10-accommodating chamber; 101-first chamber; 102-second chamber; 103-first opening;

[0028] 11-elastic fishing hook; 12-groove; 13-wire connecting part;

[0029] 2-opening block; 21-first connecting portion; 22-rightening portion; 201-hinge portion; 202-elastic connecting portion; 203-second opening;

[0030] 3-Limiting parts.

[0031] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0033] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] The terms "upper" and "lower" etc. are used to describe the relative position relationship of each structure in the accompanying drawings, which is only for the convenience of description and is not intended to limit the scope of implementation of the present invention. Changes or adjustments to the relative relationship shall be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In addition, in the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the field of oil extraction technology, small tubular and rod-shaped objects that fall into the well are generally called fallen fish. Fallen fish in the well will have an impact on subsequent oil production operations, and usually need to be salvaged using salvage tools.

[0038] Generally, it is necessary to use steel wire to lower the fishing tool to the bottom of the well to fish. The pipe string is often equipped with safety valves, fracturing valves, sleeves and other components, which form a smooth transition section with the pipe string. The inner diameter of these components is smaller than the inner diameter of the pipe string, forming a diameter reduction section. The outer diameter of conventional fishing tools is smaller than the inner diameter of the diameter reduction section, so that they can pass through the diameter reduction section smoothly.

[0039] However, after the salvage tool is lowered to the bottom of the well, it is located in the middle of the bottom of the well, and some fish are distributed close to the well wall. In this way, after the salvage tool passes the small-diameter end, it is difficult to salvage the fish near the well wall with a larger inner diameter of the pipe string.

[0040] In order to solve the above technical problems existing in the prior art, the present embodiment provides a salvage tool. The salvage tool provided by the present embodiment is exemplarily described below from aspects such as material selection, shape, structure, connection mode and matching relationship of various components, so that those skilled in the art can clearly and completely understand the technical solution provided by the present embodiment and can easily implement it based on the understanding.

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the salvage tool provided in this embodiment includes a salvage spear 1, an accommodating chamber 10 is formed inside the salvage spear 1, a first opening 103 for fish to enter is formed at one end of the salvage spear 1, the accommodating chamber 10 includes a first chamber 101 and a second chamber 102 that are connected to each other, the second chamber 102 is connected to the first opening 103, the inner diameter of the second chamber 102 gradually increases along the axial direction of the salvage spear 1 toward the first opening 103, and an elastic salvage hook 11 is arranged on the connecting surface of the first chamber 101 and the second chamber 102; and a plurality of opening blocks 2 are further provided, the opening blocks 2 include a first connecting portion 21 and a supporting portion 22. The positive portion 22 and the first connecting portion 21 are located in the middle of the opening block 2, the straightening portion 22 is located at the lower end of the opening block 2, an elastic member is provided at one end of the accommodating chamber 10 away from the first opening 103, a plurality of grooves 12 are arranged at intervals on the outer peripheral wall of the salvage spear 1, the opening block 2 corresponds to the grooves 12 one by one, the upper end of the opening block 2 is connected to the elastic member, and the first connecting portion 21 is hinged to the side wall of the groove 12; the plurality of straightening portions 22 are located on the same conical surface, and the inner diameter of the conical surface gradually increases in the direction away from the first opening 103; and the inner diameter of the first opening 103 is greater than or equal to the minimum inner diameter of the conical surface.

[0042] For example, the outer diameter of the existing salvage tool is fixed. During the lowering process, the salvage tool is always located at the axial position of the pipe string. After the salvage tool passes through the diameter reduction section of the pipe string, it cannot salvage the fish near the well wall at the position where the inner diameter of the pipe string is larger. The salvage tool provided in this embodiment requires that it can pass through the diameter reduction section of the pipe string and that the diameter of the salvage tool can be increased at the position where the inner diameter of the pipe string is larger, that is, the purpose of this embodiment is to provide a salvage tool with a variable diameter.

[0043] The salvage tool provided in this embodiment includes a salvage spear 1 and an opening block 2. The salvage spear 1 is a basic component that can realize the salvage function but does not have the function of increasing the diameter. The opening block 2 is used to realize the function of increasing the diameter of the salvage tool of this embodiment.

[0044] like Figure 3 As shown, the salvage spear 1 can be a tubular structure to match the shape of the existing pipe column. The upper end of the salvage spear 1 can be connected to a steel wire so that the salvage spear 1 can be lowered through the steel wire on the well to salvage the fallen fish. The upper end of the salvage spear 1 is generally also connected to a release joint, a weight rod, a jar, a wire rope cap and other tools. The weight rod can apply pressure to the salvage spear 1 toward the bottom of the well by its own gravity to further overcome the friction resistance between the salvage spear 1 and the inner wall of the pipe column, so that the salvage spear 1 can be smoothly lowered. During the process of salvaging the body of the fallen fish by the salvage spear 1, if the fish is stuck, the release joint is jarred with a jar to disconnect the release joint and then the salvage spear 1 is used to salvage again.

[0045] The outer diameter of the lower part of the salvage spear 1 is generally matched with the minimum diameter of the pipe string, and the outer diameter of the middle part of the salvage spear 1 is smaller than the inner diameter of the pipe string, so that the salvage spear 1 can smoothly pass through the diameter reduction section of the pipe string, and the outer diameter of the lower part of the salvage spear 1 is relatively larger than the outer diameter of the middle part of the salvage spear 1. The larger outer diameter of the lower part of the salvage spear 1 can play a certain positioning role and reduce the shaking of the salvage spear 1 in the pipe string to a certain extent. The smaller outer diameter of the middle part of the salvage spear 1 can reduce the resistance between the salvage spear 1 and the pipe string, so that the salvage spear 1 can be smoothly lowered.

[0046] When the salvage spear 1 is used for salvaging, the fish first enters the second cavity 102 of the accommodating cavity 10 of the salvage spear 1 through the first opening 103 of the salvage spear 1, and the inner diameter of the second cavity 102 gradually increases upward from the first opening 103 of the salvage spear 1. The inner diameter of the first opening 103 of the salvage spear 1 is the largest, so that the fish can easily enter the second cavity 102 of the salvage spear 1, and smoothly reach the position of the elastic salvage hook 11 as the diameter of the inner cavity of the salvage spear 1 changes.

[0047] The inner diameter of the position where the elastic salvage hook 11 is set on the salvage spear 1 is smaller than the salvage diameter of the fallen fish. When the fallen fish passes through the elastic salvage hook 11, the inner diameter of the elastic salvage hook 11 shrinks, allowing the fallen fish to enter the first cavity 101 of the salvage spear 1, and then the elastic salvage hook 11 returns to its original diameter to prevent the fallen fish from falling out of the first cavity 101.

[0048] In this embodiment, a plurality of opening blocks 2 are connected to the salvage spear 1, and the first connection portion 21 of the opening block 2 is hinged to the salvage spear 1 and elastically connected via an elastic member. The position where the opening block 2 is hinged to the salvage spear 1 forms an articulated portion 201, and the position where the opening block 2 is connected to the elastic member forms an elastic connection portion 202. The force applied by the elastic member to the opening block 2 causes the straightening portion of the opening block 2 to have a tendency to rotate around the articulated portion 201 and move away from the axis of the salvage spear, that is, the opening block 2 has a tendency to open.

[0049] A plurality of grooves 12 are arranged at intervals on the outer wall of the salvage spear 1, and the opening block 2 is hinged inside the groove 12, so that the opening block 2 can rotate around the hinge portion 201; and an elastic member is connected to the end of the accommodating cavity 10 of the salvage spear 1 away from the first opening 103, and the first connecting portion 21 of the opening block 2 is also connected to the elastic member to apply a force to the opening block 2 to make the straightening portion of the opening block 2 away from the axis of the salvage spear 1.

[0050] The elastic member connected between the opening block 2 and the fishing spear 1 can be a torsion spring, a tension spring, a rubber spring, etc. Those skilled in the art can make practical applications according to the above purpose and the use methods of different types of springs.

[0051] The straightening portion 22 of the opening block 2 is below the first opening 103 of the salvage spear 1. The opening block 2 is used to change the outer diameter of the salvage tool, mainly to change the maximum outer diameter of the salvage tool when the fish enters the accommodating cavity 10 of the salvage spear 1. The straightening portion 22 is equivalent to an extension of the salvage spear 1, and a second opening 203 for the fish to enter is formed at the end of the straightening portion 22.

[0052] The inner diameter of the straightening portion 22 gradually increases in the direction away from the first opening 103, that is, when the fish enters the inner cavity surrounded by the plurality of straightening portions 22, the inner diameter is initially larger to facilitate the entry of the fish; then the inner diameter of the straightening portion 22 gradually decreases to the first opening 103, and the minimum inner diameter of the conical surface surrounded by the plurality of straightening portions 22 is less than or equal to the inner diameter of the first opening 103, so that the fish can smoothly pass through the first opening 103 into the accommodating cavity 10 of the salvage spear 1 after passing through the straightening portion 22.

[0053] In the salvage tool provided in this embodiment, the elastic member makes the salvage portion of the opening block 2 always keep the tendency to move away from the axis of the salvage spear 1. When the salvage tool passes through the diameter reduction section of the pipe string, the opening block 2 is squeezed by the inner wall of the diameter reduction section, and the opening block 2 shrinks toward the axis of the salvage spear 1 to reduce the outer diameter of the salvage tool, so that the salvage tool can smoothly pass through the diameter reduction section; after the salvage spear 1 passes through the diameter reduction section, under the action of the elastic member, the straightening portion of the opening block 2 rotates in the direction away from the axis of the salvage spear 1, the diameter of the salvage spear 1 increases, and the inner wall of the straightening portion 22 of the salvage spear 1 squeezes the fish near the well wall to the first opening 103 of the salvage spear 1, so as to salvage the fish near the well wall.

[0054] like Figure 1 As shown, as one of the optional implementation schemes of this embodiment, the groove 12 extends along the axial direction of the fishing spear 1, and the opening block 2 is located inside the groove 12.

[0055] For example, the main function of the expansion block 2 is to increase the diameter of the fishing tool after passing through the diameter-reducing section of the pipe string, and squeeze the fish near the well wall to the first opening 103 of the fishing spear 1 through the inner wall of the straightening portion 22 of the expansion block 2. When passing through the diameter-reducing section, it is a better choice that the minimum outer diameter of the fishing tool provided with the expansion block 2 is consistent with the outer diameter of the fishing spear 1.

[0056] In this way, a groove 12 extending along the axis of the salvage spear 1 can be provided on the outer wall of the salvage spear 1. When the salvage tool passes through the diameter reduction section, the expansion block 2 can be retracted into the groove 12, so that the minimum outer diameter of the salvage tool is consistent with the outer diameter of the salvage spear 1.

[0057] like Figure 7 As shown, as one of the optional implementation schemes of this embodiment, the horizontal cross-section of the straightening portion 22 is fan-shaped, and the sum of the central angles of the plurality of straightening portions 22 is 360 degrees.

[0058] For example, the plurality of straightening parts 22 of the opening block 2 can be evenly distributed around the axis of the fishing spear 1. When the opening block 2 is in the contracted state, the outer walls of the straightening parts 22 of the opening block 2 can be formed into a circular tube, and the inner walls of the straightening parts 22 of the opening block 2 can be formed into a cone. In this way, the circumferential area of ​​the straightening parts 22 can be larger, making it easier to contact the fallen fish, and squeeze the fallen fish through the inner wall of the straightening parts 22 to the first opening 103 of the fishing spear 1.

[0059] like Figure 1 , Figure 2 and Figure 6 As shown, as one of the optional implementation schemes of this embodiment, the outer wall of the straightening portion 22 at one end away from the first opening 103 forms an arc transition section with a gradually decreasing outer diameter.

[0060] Illustratively, during the process of lowering the salvage tool, the end of the straightening portion 22 of the salvage tool away from the first opening 103 first passes through the diameter reduction section of the pipe string, and an arc transition section is formed on the outer wall of the end of the straightening portion 22 away from the first opening 103. The outer diameter of the arc transition section first enters the diameter reduction section of the pipe string with a small diameter, and then gradually increases, which is conducive to the smooth passage of the salvage tool through the diameter reduction section of the pipe string.

[0061] like Figure 1 and Figure 2As shown, as one of the optional implementation schemes of this embodiment, it also includes a limit member 3, which is arranged in the accommodating cavity 10, and the first end of the limit member 3 is connected to the end of the accommodating cavity 10 away from the first opening 103, and the upper end of the opening block 2 can be abutted against the limit member 3 to limit the rotation range of the opening block 2.

[0062] Exemplarily, the opening block 2 has a tendency to open due to the action of the elastic member, and the opening block 2 only needs to automatically open when entering a position with a larger inner diameter of the pipe string, and the maximum outer diameter of the opening block 2 after opening is adapted to the maximum inner diameter of the pipe string.

[0063] In order to facilitate the use of the salvage tool, it is necessary to limit the opening range of the opening block 2 to avoid the opening diameter of the opening block 2 being too large compared to the required diameter, which makes it inconvenient to use. The opening block 2 rotates around the hinge 201 of the opening block 2. As long as the rotation range of the upper end of the opening block 2 is limited, the overall rotation range of the opening block 2 can be limited.

[0064] As one of the optional implementation schemes of this embodiment, the limit member 3 is a limit rod, which extends along the axial direction of the salvage spear 1. The end of the limit rod away from the first opening 103 is connected to the accommodating chamber 10, and the end of the limit rod facing the first opening 103 forms an outer flange, and the upper end of the opening block 2 can be against the outer flange.

[0065] As one of the optional implementation schemes of this embodiment, the elastic member is a torsion spring; a positioning rod is connected to the accommodating cavity 10, the torsion spring is sleeved on the positioning rod, and one end of the torsion spring is connected to the accommodating cavity 10, and the other end of the torsion spring is connected to the first connecting part 21.

[0066] Exemplarily, the elastic connection part 202 of the opening block 2 may be connected to a torsion spring, the other end of which is fixed inside the salvage spear 1 , and the torsion spring may be sleeved on a positioning rod so that the torsion spring can rotate around the positioning rod.

[0067] like Figure 1 , Figure 2 and Figure 3 As shown, as one of the optional implementation schemes of this embodiment, the elastic fishing hook 11 extends from the inner wall of the fishing spear 1 toward the axis of the fishing spear 1, and the elastic fishing hook 11 is inclined in a direction away from the first opening 103.

[0068] As one of the optional implementation schemes of this embodiment, a first through hole is provided on the side wall of the groove 12, and a second through hole is provided on the first connecting portion 21, and the second through hole is hinged to the first through hole via a pin shaft.

[0069] As one of the optional implementation schemes of this embodiment, a steel wire connection portion 13 is formed at one end of the fishing spear 1 away from the first opening 103 .

[0070] Exemplarily, the steel wire connection portion 13 on the salvage spear 1 may be an annular groove or a circular ring. After the steel wire is connected to the steel wire connection portion 13 of the salvage spear 1, the salvage tool of this embodiment may be lowered to the bottom of the well.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fishing tool, characterized in that: A salvaging spear is provided, wherein a receiving cavity is formed inside the salvaging spear, a first opening is formed at one end of the salvaging spear for fish to enter, the receiving cavity comprises a first cavity and a second cavity which are connected to each other, the second cavity is connected to the first opening, the inner diameter of the second cavity gradually increases along the axial direction of the salvaging spear toward the direction of the first opening, and an elastic salvaging hook is provided on the connecting surface between the first cavity and the second cavity; It also includes a plurality of opening blocks, the opening blocks include a first connecting portion and a straightening portion, the first connecting portion is located in the middle of the opening block, the straightening portion is located at the lower end of the opening block, an elastic member is provided at one end of the accommodating cavity away from the first opening, a plurality of grooves are provided at intervals on the outer peripheral wall of the salvage spear, the opening blocks correspond to the grooves one by one, the upper end of the opening block is connected to the elastic member, and the first connecting portion is hinged to the side wall of the groove; The plurality of straightening portions are located on the same conical surface, and the inner diameter of the conical surface gradually increases in a direction away from the first opening; and the inner diameter of the first opening is greater than or equal to the minimum inner diameter of the conical surface; The horizontal cross-section of the straightening portion is fan-shaped, and the sum of the central angles of the plurality of straightening portions is 360 degrees; It also includes a limiting member, which is arranged in the accommodating cavity, and a first end of the limiting member is connected to an end of the accommodating cavity away from the first opening, and the upper end of the opening block can abut against the limiting member to limit the rotation range of the opening block.

2. The fishing tool according to claim 1, characterized in that: The groove extends along the axial direction of the fishing spear, and the expansion block is located inside the groove.

3. The fishing tool according to claim 1, characterized in that: An end of the outer wall of the straightening portion away from the first opening forms an arc transition section with a gradually decreasing outer diameter.

4. The fishing tool according to claim 1, characterized in that: The limiting member is a limiting rod, which extends along the axial direction of the salvage spear. One end of the limiting rod away from the first opening is connected to the accommodating cavity. One end of the limiting rod facing the first opening forms an outer flange, and the upper end of the opening block can abut against the outer flange.

5. The fishing tool according to claim 1, characterized in that: The elastic member is a torsion spring; A positioning rod is connected in the accommodating cavity, the torsion spring is sleeved on the positioning rod, one end of the torsion spring is connected to the accommodating cavity, and the other end of the torsion spring is connected to the first connecting portion.

6. The fishing tool according to claim 1, characterized in that: The elastic fishing hook extends from the inner wall of the fishing spear toward the axis of the fishing spear, and the elastic fishing hook is inclined in a direction away from the first opening.

7. The fishing tool according to claim 1, characterized in that: A first through hole is arranged on the side wall of the groove, a second through hole is arranged on the first connecting portion, and the second through hole is hingedly connected to the first through hole via a pin shaft.

8. The fishing tool according to claim 1, characterized in that: An end of the fishing spear facing away from the first opening forms a wire connection portion.

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