Underground fishing tool
By designing an underground salvage tool including push rod, salvage claw, rotating ratchet and return spring, the problems of downhole salvage inconvenience and fall off caused by insufficient hydraulic pressure in the prior art are solved, and a more firm clamping and anti-detachment effect is achieved.
Patent Information
- Application Number
- CN202421881671.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-05
AI Technical Summary
Due to insufficient hydraulic pressure, existing downhole salvage tools are difficult to generate enough pressure to clamp and remove the fish from the bottom of the well, which is relatively inconvenient to salvage and prone to falling off.
A downhole salvage tool is designed, and the salvage claws are closed and clamped along the guide port by pressing the push rod. Combined with the design of the rotating ratchet and return spring, a more firm clamping and anti-detachment effect is achieved.
It achieves more convenient operation for downhole salvage, with more clamping force, and better anti-detachment effect during the salvage process, avoiding the occurrence of fall off.
Smart Images
Figure CN222863352U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drilling and fishing tools, in particular to a downhole fishing tool. Background Art
[0002] During downhole operations such as logging, perforating, and well repair, some construction tools or debris may fall into the well due to casing deformation, wax sticking, sanding, etc., causing tubing blockage, which seriously affects the normal construction and oil production in the oil and gas wells. Therefore, it is necessary to use downhole salvage tools to salvage the objects that fall into the well to ensure the normal use of the oil and gas wells.
[0003] Among the existing commonly used downhole salvage tools, drilling fluid hydraulics are mostly used as the power for salvage. However, there is a problem of insufficient hydraulic pressure in the drilling fluid drive, which makes it difficult to generate sufficient pressure to clamp and remove the fish in the well (referring to the fallen objects in the well, especially the drilling tools left in the well due to an accident). Salvage is inconvenient and it is very easy to fall off. Utility Model Content
[0004] The utility model aims to provide a downhole fishing tool which is convenient for clamping the fish out of the well and has a more firm clamping function to avoid the fish coming out during the lifting process.
[0005] The embodiment of the utility model is realized by the following technical scheme: a downhole fishing tool, comprising an upper joint, a push rod, an upper shell and a lower shell connected in sequence, one end of the push rod is installed in the upper shell and is slidably connected thereto; a fishing claw, the fishing claw is arranged in the lower shell, and a guide opening is provided at the lower end of the lower shell, the fishing claw is driven to move downward along the lower shell by the downward movement of the upper joint and the push rod, and the fishing claw is driven to close inward through the guide opening.
[0006] Preferably, it also includes a rotating ratchet and a reset spring, the rotating ratchet is arranged between the push rod and the salvage claw; the upper shell is provided with an inner slide and a stopper adapted to the rotating ratchet, and the lower end of the push rod is provided with a toothed surface adapted to the rotating ratchet; the reset spring is clamped between the inner wall of the lower shell and the salvage claw; the push rod moves downward to drive the rotating ratchet and the salvage claw to move downward and squeeze the reset spring, and the rotating ratchet moves out of the inner slide and rotates to switch to the stopper.
[0007] Preferably, the stopper and the inner slideway are arranged alternately at intervals along the inner wall of the upper shell.
[0008] Preferably, the length of the inner slideway is greater than the length of the stopper.
[0009] Preferably, a plurality of claw plates are distributed around the outer edge of the salvaging claw, and anti-slip teeth are provided on the inner side of the claw plate.
[0010] Preferably, a limit plate is provided in the lower shell, and a plurality of extension holes corresponding to the claw plates are opened on the limit plate; the limit plate and the lower shell are connected to the rear end of the guide opening.
[0011] Preferably, the upper shell is threadedly connected to the lower shell, and the upper shell is coaxially and equidiametrically connected to the lower shell.
[0012] The technical solution of the embodiments of the utility model has at least the following advantages and beneficial effects: compared with the prior art, the utility model presses down the push rod so that the salvage claws move downward relative to the lower shell body, and the salvage claws close along the guide opening to clamp the fallen fish, so that salvage is more convenient, the clamping force is more sufficient, and the anti-falling effect of the fallen fish during the salvage process is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0014] Figure 1 A schematic diagram of the structure of a downhole fishing tool before fishing provided by an embodiment of the utility model;
[0015] Figure 2 A schematic diagram of the structure of a downhole fishing tool provided by an embodiment of the utility model during fishing;
[0016] Figure 3 It is a structural schematic diagram of the push rod in the utility model;
[0017] Figure 4 It is a structural schematic diagram of the upper shell in the utility model;
[0018] Figure 5 It is a schematic diagram of the inner hole of the upper shell in the utility model;
[0019] Figure 6 It is a structural schematic diagram of the salvage claw in the utility model;
[0020] Figure 7 It is a schematic diagram of the structure of the rotary ratchet in the utility model;
[0021] Figure 8 It is a structural schematic diagram of the lower shell in the utility model;
[0022] Fig. 9 It is a schematic diagram of the inner hole of the lower shell in the utility model.
[0023] Icon: 1-upper joint, 2-push rod, 21-toothed surface, 3-rotating ratchet, 4-fishing claw, 41-claw plate, 411-anti-slip teeth, 5-upper shell, 51-inner slide, 52-stopper, 6-lower shell, 61-guide port, 62-limiting plate, 621-extending hole, 7-reset spring, 8-fish falling. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.
[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0027] Example
[0028] The following is further described in conjunction with specific embodiments. Figure 1-Figure 9 As shown, this embodiment is a downhole fishing tool, comprising an upper joint 1, a push rod 2, an upper shell 5 and a lower shell 6 connected in sequence, one end of the push rod 2 is installed in the upper shell 5 and is slidably connected thereto; a fishing claw 4, the fishing claw 4 is arranged in the lower shell 6, and a guide port 61 is arranged at the lower end of the lower shell 6, and the fishing claw 4 is driven to move downward along the lower shell 6 by the upper joint 1 and the push rod 2, and the fishing claw 4 is driven to close inward through the guide port 61; specifically, the upper joint 1 and the drill pipe The fish 8 is then loaded into the fishing claw 4 and the fish 8 is then loaded into the fishing claw 4. ...
[0029] Reference Figure 1 and Figure 2 As shown, this embodiment also includes a rotating ratchet 3 and a reset spring 7. The rotating ratchet 3 is arranged between the push rod 2 and the fishing claw 4. The upper shell 5 is provided with an inner slide 51 and a stopper 52 adapted to the rotating ratchet 3. The lower end of the push rod 2 is provided with a toothed surface 21 adapted to the rotating ratchet 3. The reset spring 7 is stuck between the inner wall of the lower shell 6 and the fishing claw 4. The push rod 2 moves downward to drive the rotating ratchet 3 and the fishing claw 4 to move downward and squeeze the reset spring 7, and the rotating ratchet 3 moves out of the inner slide 51 and rotates to switch to the stopper 52. Specifically, when the push rod 2 moves downward, the rotating ratchet 3 is pushed downward to move out of the inner slide 51. The ratchet 3 is moved out and rotated circumferentially by a certain angle, so that the rotating ratchet 3 is stuck at the stopper 52 to be locked, and the rotating ratchet 3 axially presses the reset spring 7 downward to lock the salvaging claw 4 in a clamping state, and the salvaging tool is lifted up together with the fallen fish 8 at this time; after the salvage work is completed, the drill pipe is pressed down, and the push rod 2 pushes the rotating ratchet 3 downward, and the rotating ratchet 3 rotates by a certain angle at the same time to re-enter the inner slideway 51, and the drill pipe is stopped from being pressed down. The salvaging claw 4 and the rotating ratchet 3 move upward under the elastic force of the reset spring 7, and the lower shell 6 moves upward synchronously to release the hold on the fallen fish 8, thereby restoring the initial state.
[0030] It should be noted that the switching principle is similar to that of a ballpoint pen, where each press switches the clamping and releasing states.
[0031] Reference Figure 4 and Figure 5 As shown, the blocks 52 and the inner slideways 51 in this embodiment are arranged alternately along the inner wall of the upper shell 5; specifically, each time the drill rod moves downward, the rotating ratchet 3 only needs to rotate a very small angle to switch between the clamping and releasing working states, and the rotating ratchet 3 rotates unidirectionally.
[0032] Reference Figure 1 and Figure 2 As shown, the length of the inner slide 51 is greater than the length of the stopper 52; specifically, when the rotating ratchet 3 enters the inner slide 51, it will retract a larger displacement, and when the rotating ratchet 3 is stuck at the stopper 52, it drives the salvage claw 4 to be squeezed out from the guide port 61 to form a clamp.
[0033] Reference Figure 6 As shown, in order to improve the firmness and anti-slip effect of the salvage, a plurality of claw plates 41 are distributed around the outer edge of the salvage claw 4, and anti-slip teeth 411 are provided on the inner side of the claw plate 41.
[0034] Reference Figure 2 , Figure 8 and Fig. 9As shown, a limit plate 62 is provided in the lower shell body 6 in this embodiment, and a plurality of extension holes 621 corresponding to the claw plate 41 are opened on the limit plate 62; the limit plate 62 is connected to the lower shell body 6 at the tail end of the guide opening 61; specifically, when the fallen fish 8 is inserted into the lower shell body 6, its top end abuts against the limit plate 62, and the claw plate 41 extends from the extension hole 621 to clamp the surrounding side of the fallen fish 8.
[0035] In order to facilitate disassembly and assembly, the upper shell 5 and the lower shell 6 are threadedly connected, one adopts an internal thread and the other adopts an external thread for docking, and the upper shell 5 and the lower shell 6 are coaxially connected with equal diameters.
[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A downhole fishing tool, comprising an upper joint (1), a push rod (2), an upper shell (5) and a lower shell (6) connected in sequence, characterized in that: One end of the push rod (2) is inserted into the upper housing (5) and is slidably connected thereto; A salvage claw (4), the salvage claw (4) being arranged in the lower shell (6), the lower end of the lower shell (6) being provided with a guide opening (61), the upper joint (1) and the push rod (2) moving downward to drive the salvage claw (4) to move downward along the lower shell (6), and the salvage claw (4) is driven to close inwards through the guide opening (61).
2. The downhole fishing tool according to claim 1, characterized in that: It also includes a rotating ratchet (3) and a return spring (7), wherein the rotating ratchet (3) is arranged between the push rod (2) and the fishing claw (4); The upper housing (5) is provided with an inner slideway (51) and a stopper (52) adapted to the rotating ratchet (3), and the lower end of the push rod (2) is provided with a toothed surface (21) adapted to the rotating ratchet (3); The return spring (7) is clamped between the inner wall of the lower shell (6) and the fishing claw (4); The push rod (2) moves downward, driving the rotating ratchet (3) and the fishing claw (4) to move downward and squeeze the return spring (7); the rotating ratchet (3) moves out of the inner slideway (51) and rotates to switch to the stopper (52).
3. The downhole fishing tool according to claim 2, characterized in that: The stoppers (52) and the inner slideways (51) are arranged alternately and at intervals along the inner wall of the upper shell (5).
4. The downhole fishing tool according to claim 3, characterized in that: The length of the inner slideway (51) is greater than the length of the stopper (52).
5. The downhole fishing tool according to claim 1, characterized in that: A plurality of claw plates (41) are distributed around the outer edge of the fishing claw (4), and anti-slip teeth (411) are provided on the inner side of the claw plate (41).
6. The downhole fishing tool according to claim 5, characterized in that: A limiting plate (62) is provided in the lower shell (6), and a plurality of extending holes (621) corresponding to the claw plates (41) are provided on the limiting plate (62).
7. The downhole fishing tool according to claim 6, characterized in that: The limiting plate (62) is connected to the lower shell (6) at the rear end of the guide opening (61).
8. The downhole fishing tool according to claim 1, characterized in that: The upper shell (5) is threadedly connected to the lower shell (6), and the upper shell (5) and the lower shell (6) are coaxially and equidiametrically connected.