Fishing tool
By designing a salvage tool with expansion claws, the problem of difficulty in fishing in the coalbed methane well repair operation is solved, and a fast and reliable salvage effect is achieved.
Patent Information
- Application Number
- CN202421719157.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In the coalbed methane well repair operation, the pump set and cable of the electric submersible screw pump are easily stuck or the connection between the motor and the pump body is broken due to uneven stress, resulting in the formation of falling fish, and conventional salvage tools are difficult to effectively salvage.
A salvage tool is designed, including a central rod, an outer sleeve and a suction member. The end of the central rod has an expansion body protruding radially. The side wall of the outer sleeve is provided with a groove to form an expansion claw piece. The expansion claw piece is opened and stuck inside the object to be salvaged by movement of the outer sleeve. The suction member is adjustable to ensure a stable connection between the expansion claw piece and the object to be salvaged.
This salvage tool can effectively prevent the substance to be salvaged from falling in the well, simplify salvage operations, ensure a stable connection between the expansion claws and the substance to be salvaged, prevent loosening, and achieve fast and reliable salvage.
Smart Images
Figure CN223018590U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of workover tools for coalbed methane wells, in particular to a fishing tool. Background Technique
[0002] In the process of coalbed methane production, horizontal wells have gradually become the main well type for development. In recent years, rodless production equipment supporting horizontal wells has gradually become the mainstream of coalbed methane drainage and gas production equipment, such as hydraulic jet pumps and electric submersible screw pumps. Among them, the electric submersible screw pump has a wide displacement range and low energy consumption, accounting for a large proportion in the application of coalbed methane wells. However, during the workover operation, due to the large outer diameter of the downhole pump unit, there is a large flat cable and its protective cover outside the pump unit, and there are varying degrees of diameter changes at the connection between the wellhead four-way and the casing collar. When lifting the original well string to the wellhead, the pump unit and the cable are prone to getting stuck. For example, during the lifting process, the force is uneven, and the connection between the motor and the pump body is extremely easy to break and cannot be lifted to the ground, thus forming a fish (drilling tools and equipment left in the well due to accidents).
[0003] The fishing spear / fishing barrel is a commonly used workover fishing tool. However, due to the extremely small annulus space between the pump body of the electric submersible screw pump and the casing, it is impossible to use the fishing barrel for external fishing; for some fish with a narrow mouth and a wide inner part, the conventional internal fishing spear cannot enter for fishing due to the limited cavity of the fish and the too narrow entrance, and rotating and applying pressure easily drops the fish into the well, further complicating the fishing operation.
[0004] Therefore, how to successfully fish the fish in the well is a technical problem that needs to be solved urgently by those skilled in the art. Content of the Utility Model
[0005] The purpose of the utility model is to provide a fishing tool that will not generate a downward force on the object to be fished, so as to avoid complicating the fishing operation caused by the object to be fished falling in the well.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] The utility model provides a fishing tool, including:
[0008] A central rod, the end of the central rod has an expansion body protruding radially;
[0009] An outer sleeve, the outer sleeve is movably sleeved on the central rod, and the central rod can drive the outer sleeve and the expansion body to extend into the inner cavity section of the object to be fished through the entrance section of the object to be fished along a first direction;
[0010] At least two cutting grooves are opened on the side wall of the outer sleeve, each cutting groove extends along the first direction to the bottom end surface of the outer sleeve, and independent expansion claw pieces are formed between two adjacent cutting grooves along the circumferential direction.
[0011] When the outer sleeve moves along the first direction, it can drive the expansion claw pieces to abut against the expansion body, so that the expansion claw pieces open along the radial direction of the outer sleeve to abut against the end face of the inlet section of the object to be salvaged;
[0012] A jacking member, which is disposed on the central rod with adjustable displacement, and the jacking member can abut against the outer sleeve and apply a force along the first direction to the outer sleeve.
[0013] Preferably, the jacking member is in threaded cooperation with the central rod.
[0014] Preferably, the jacking member has two oppositely arranged pressure-receiving planes for abutting against a wrench.
[0015] Preferably, the expansion body is in a frustum structure.
[0016] Preferably, a stepped convex surface is provided on the outer sleeve above the expansion claw pieces, and the stepped convex surface can abut against the outer end face of the inlet section of the object to be salvaged along the first direction.
[0017] Preferably, the central rod has a flushing channel for circulating flushing liquid.
[0018] The beneficial effects of the present utility model are as follows:
[0019] The fishing tool provided by the present utility model has an outer sleeve movably sleeved on a central rod. The end of the central rod has an expansion body protruding radially. The central rod can drive the outer sleeve and the expansion body to pass through the inlet section of the object to be fished and extend into the inner cavity section of the object to be fished. Since cutting grooves are provided on the side wall of the outer sleeve, and each cutting groove extends along a first direction to the bottom end surface of the outer sleeve, independent expansion claw pieces are formed between adjacent two cutting grooves. Since the movement of the outer sleeve along the first direction can drive the expansion claw pieces to be in contact with the expansion body, the expansion claw pieces are guided and limited by the expansion body to move away from each other radially to open. And since the opened expansion claw pieces can abut against the end surface of the inlet section of the object to be fished, the expansion claw pieces can be stably connected to the object to be fished by being stuck inside the object to be fished. Since a position-adjustable jacking member is also provided on the central rod, the jacking member can abut against the outer sleeve and apply a force along the first direction to the outer sleeve. Therefore, the jacking member can always tightly abut against the outer sleeve, so that the expansion claw pieces abut against the end surface of the inlet section of the object to be fished, to ensure the reliability of the connection between the expansion claw pieces and the object to be fished, and prevent the expansion claw pieces from loosening from the object to be fished due to the movement of the outer sleeve in the opposite direction of the first direction. This fishing tool has a simple structure, is easy to use, and does not generate a downward force on the object to be fished during the fishing process, thus avoiding the complication of the fishing operation caused by the falling of the object to be fished in the well. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic structural view of the fishing tool provided by the specific embodiment of the present utility model;
[0021] Figure 2 is a schematic structural view of the outer sleeve provided by the specific embodiment of the present utility model;
[0022] Figure 3 is a schematic structural view of the central rod provided by the specific embodiment of the present utility model;
[0023] Figure 4 is a sectional view of the object to be fished provided by the specific embodiment of the present utility model.
[0024] In the figure:
[0025] 100 - object to be fished;
[0026] 1 - central rod; 11 - external thread;
[0027] 2 - expansion body;
[0028] 3 - outer sleeve; 31 - cutting groove; 32 - expansion claw piece;
[0029] 4 - jacking member. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.
[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right", and "above and to the left" of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below and to the right", and "below and to the left" of the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal height than the second feature.
[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", and "left" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.
[0034] Such as Figure 1 、 Figure 2 And Figure 4As shown in the figure, the present utility model provides a fishing tool, which includes a central rod 1, an outer sleeve 3 and a jacking member 4. The end of the central rod 1 has an expansion body 2 protruding radially; the outer sleeve 3 is movably sleeved on the central rod 1, and the central rod 1 can drive the outer sleeve 3 and the expansion body 2 to extend into the inner cavity section of the object to be fished 100 through the inlet section of the object to be fished 100 along the first direction; at least two cutting grooves 31 are formed on the side wall of the outer sleeve 3, and each cutting groove 31 extends along the first direction to the bottom end surface of the outer sleeve 3. An independent expansion claw 32 is formed between two adjacent cutting grooves 31 in the circumferential direction. When the outer sleeve 3 moves along the first direction, it can drive the expansion claw 32 to abut against the expansion body 2, so that the expansion claw 32 expands radially along the outer sleeve 3 to abut against the end surface of the inlet section of the object to be fished 100; the jacking member 4 is arranged on the central rod 1 with adjustable displacement, and the jacking member 4 can abut against the outer sleeve 3 and apply a force along the first direction to the outer sleeve 3. In this embodiment, the outer sleeve 3 is movably sleeved on the central rod 1, the end of the central rod 1 has an expansion body 2 protruding radially, and the central rod 1 can drive the outer sleeve 3 and the expansion body 2 to extend into the inner cavity section of the object to be fished 100 together through the inlet section of the object to be fished 100. Since the cutting grooves 31 are formed on the side wall of the outer sleeve 3 and each cutting groove 31 extends along the first direction to the bottom end surface of the outer sleeve 3, independent expansion claws 32 are formed between two adjacent cutting grooves 31; since the outer sleeve 3 can drive the expansion claws 32 to abut against the expansion body 2 when moving along the first direction, the expansion claws 32 are guided and limited by the expansion body 2 and move away from each other radially to expand. And since the expanded expansion claws 32 can abut against the end surface of the inlet section of the object to be fished 100, the expansion claws 32 can be stably connected to the object to be fished 100 by being stuck inside the object to be fished 100; since the position-adjustable jacking member 4 is also arranged on the central rod 1, and the jacking member 4 can abut against the outer sleeve 3 and apply a force along the first direction to the outer sleeve 3, the jacking member 4 can always abut tightly against the outer sleeve 3, so that the expansion claws 32 abut against the end surface of the inlet section of the object to be fished 100, to ensure the reliability of the connection between the expansion claws 32 and the object to be fished 100, and prevent the expansion claws 32 from loosening from the object to be fished 100 due to the movement of the outer sleeve 3 in the opposite direction of the first direction. This fishing tool has a simple structure and is easy to use, and does not generate a downward force on the object to be fished 100 during the fishing process, thus avoiding the complication of the fishing operation caused by the object to be fished 100 falling in the well. Specifically, for the object to be fished 100 stuck near the wellhead, conventional fishing tools and fishing methods need to apply a downward force to the object to be fished 100 to connect with it. However, the object to be fished 100 near the wellhead is very likely to slide downward due to the instability of the external force received, which not only cannot complete the fishing operation, but also increases the difficulty of subsequent fishing, thus causing the complication of the fishing operation.Using this fishing tool can quickly fish for the object to be fished 100 with a "narrow mouth and wide inside". The outer diameters of the expansion body 2 and the outer sleeve 3 are both smaller than the inner diameter of the inlet section of the object to be fished 100. During fishing, the expansion body 2 and the unopened expansion claw pieces 32 will be driven by the central rod 1 to extend into the inlet section of the object to be fished 100. Subsequently, the staff adjusts the position of the jacking member 4 on the central rod 1, thereby pushing the outer sleeve 3 to move on the central rod 1 along the first direction. The expansion claw pieces 32 at the end of the outer sleeve 3 will abut against the expansion body 2 and open, and finally be clamped on the stepped diameter-changing structure at the connection between the inlet section and the inner cavity section of the object to be fished 100, so as to realize tightly supporting against the object to be fished 100 from the inside of the object to be fished 100.
[0035] Further, as Figure 1 and Figure 3 shown, the jacking member 4 is in threaded cooperation with the central rod 1. In this embodiment, the upper half of the central rod 1 is provided with an external thread 11, the jacking member 4 has an internal thread matching the external thread 11, the jacking member 4 is screwed onto the central rod 1, and the staff can drive the outer sleeve 3 by screwing the jacking member 4: when the fishing tool is lowered in place, the staff screws the jacking member 4 forward, then the jacking member 4 moves along the first direction on the central rod 1 close to the expansion body 2, thereby driving the outer sleeve 3 to move downward along the first direction, and the expansion claw pieces 32 will contact the expansion body 2 and open under the guiding action of the expansion body 2, and then complete the clamping of the fishing tool and the object to be fished 100; after that, the staff starts to lift the fishing tool. During this process, since the jacking member 4 is threadedly connected to the central rod 1, the jacking member 4 can always abut tightly against the outer sleeve 3, thus ensuring the stability and reliability of the entire fishing process.
[0036] Specifically, the jacking member 4 has two relatively arranged pressure-receiving planes for abutting against a wrench. In this embodiment, the jacking member 4 has two opposite pressure-receiving planes, which is convenient for the staff to use a wrench to screw the jacking member 4, saving time and effort and greatly facilitating the fishing operation. Specifically, the jacking member 4 is an external hexagonal nut.
[0037] Further, the expansion body 2 is a frustum structure. In this embodiment, the expansion body 2 is a frustum structure, and its side surface is a smooth arc surface, which can play a guiding role for the expansion claw pieces 32, so that the expansion claw pieces 32 can open smoothly. Specifically, the expansion body 2 can also be other structural bodies with a smooth transition side surface, as long as it can enable the expansion claw pieces 32 to open smoothly under the guiding and limiting action of the expansion body 2. The specific shape of the expansion body 2 is not limited here.
[0038] In this embodiment, a stepped convex surface is provided above the expansion claw piece 32 on the outer sleeve 3, and the stepped convex surface can abut against the outer end surface of the inlet section of the object to be salvaged 100 along the first direction. In this embodiment, the outer sleeve 3 also has a stepped convex surface, which is located above the expansion claw piece 32. The stepped convex surface divides the outer sleeve 3 into upper and lower parts. The outer diameter of the upper part of the outer sleeve 3 is greater than the inner diameter of the inlet section of the object to be salvaged 100, and the outer diameter of the lower part of the outer sleeve 3 is smaller than the inner diameter of the inlet section of the object to be salvaged 100. Therefore, the stepped convex surface can be placed on the outer end surface of the inlet section of the object to be salvaged 100 along the first direction, preventing the salvage tool from accidentally falling into the well from the ground; at the same time, since the stepped convex surface is provided on the outer sleeve 3 above the expansion claw piece 32, when the staff lowers the salvage tool, when the stepped convex surface abuts against the object to be salvaged 100, it indicates that the expansion claw piece 32 has extended into the inlet section of the object to be salvaged 100. At this time, the jacking member 4 can be screwed to drive the outer sleeve 3 to tighten the object to be salvaged 100 from the inside of the object to be salvaged 100. Therefore, the stepped convex surface is used to calibrate the lowering distance of the salvage tool to prompt the staff that the salvage tool has reached the lowering position where the salvage operation can be carried out. Specifically, during the process of lowering the salvage tool, the staff uses a ground hoist to lower it slowly. Therefore, the pressure of the stepped convex surface on the object to be salvaged 100 is very small, and during the salvage process, the salvage tool is always suspended by the ground hoist. Therefore, the downward pressure generated by the stepped convex surface on the object to be salvaged 100 can be ignored.
[0039] Further, the central rod 1 has a flushing channel for circulating the flushing liquid. In this embodiment, the flushing channel runs through the central rod 1 and the expansion body 2; when the object to be salvaged 100 is covered by downhole debris or the pipe orifice is blocked, the central rod 1 can be connected to the ground flushing device, and then the circulating flushing liquid can be injected into the well through the flushing channel to flush the object to be salvaged 100 first, facilitating the subsequent salvage operation.
[0040] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A fishing tool, characterized in that: include: A central rod (1), wherein the end of the central rod (1) has an expansion body (2) protruding in the radial direction; An outer sleeve (3), the outer sleeve (3) being movably sleeved on the central rod (1), the central rod (1) being capable of driving the outer sleeve (3) and the expansion body (2) to pass through the entrance section of the object to be salvaged (100) along a first direction and extend into the inner cavity section of the object to be salvaged (100); At least two grooves (31) are formed on the side wall of the outer sleeve (3), each of the grooves (31) extends along the first direction to the bottom end surface of the outer sleeve (3), and an independent expansion claw piece (32) is formed between two adjacent grooves (31) in the circumferential direction. The outer sleeve (3) moves along the first direction to drive the expansion claw piece (32) to abut against the expansion body (2), so that the expansion claw piece (32) opens in the radial direction of the outer sleeve (3) to abut against the end surface of the entrance section of the object to be salvaged (100); A jacking member (4), wherein the jacking member (4) is arranged on the central rod (1) in an adjustable manner, and the jacking member (4) can abut against the outer sleeve (3) and apply a force along the first direction to the outer sleeve (3).
2. The fishing tool according to claim 1, characterized in that: The jacking member (4) is threadably matched with the center rod (1).
3. The fishing tool according to claim 2, characterized in that: The jacking member (4) has two pressure-bearing planes arranged opposite to each other, and the pressure-bearing planes are used to abut against a wrench.
4. The fishing tool according to claim 1, characterized in that: The expansion body (2) is a truncated cone structure.
5. The fishing tool according to claim 1, characterized in that: A stepped convex surface is provided on the outer sleeve (3) above the expansion claw piece (32), and the stepped convex surface can abut against the outer end surface of the entrance section of the object to be salvaged (100) along the first direction.
6. The fishing tool according to any one of claims 1 to 5, characterized in that: The central rod (1) has a flushing channel, and the flushing channel is used for circulating flushing liquid.