Hydraulic returnable underground fishing tool
Through the hydraulically driven elastic limit block and push ring structure, the problem of existing retractable salvage tools failing to unblock heavy-duty fall objects is solved, and a simple and efficient fall objects separation effect is achieved.
Patent Information
- Application Number
- CN202421881949.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-05
AI Technical Summary
The existing retractable salvage tools have a high risk of failure in the removal of the card when facing heavy loads, resulting in complex operation and difficult success.
A hydraulic retractable downhole salvage tool is designed. By setting an elastic limit block and a push ring in the joint claw barrel, the elastic limit block is squeezed by using the hydraulic drive push ring to unlock the lock, and the separation of the claw and the shell is achieved. The structure is simple and easy to operate.
In heavy-duty falling objects, the smooth separation of the jaws and falling objects is achieved through hydraulic drive, reducing the risk of card failure, making it easy to operate and effective.
Smart Images
Figure CN223075509U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drilling fishing tools, and particularly relates to a hydraulic retrievable downhole fishing tool. Background Art
[0002] During the process of oil extraction and production, due to various reasons such as operation errors and equipment failures, drill pipes, tubing, etc. may be left in the well. These fallen objects will hinder normal operations, prolong the oil extraction cycle, and may even cause serious safety accidents.
[0003] When a downhole falling object occurs during oil extraction, a fishing tool needs to be immediately used to fish out the downhole falling object. The retrievable fishing tool has become the preferred tool in fishing operations due to its simple operation, reliable performance, and the characteristic of being able to withdraw the falling object.
[0004] Common operation methods for separating conventional fallen objects from fishing tools are as follows: 1. Rotate the pipe string and then lift it to separate the fallen object from the fishing tool. 2. Inject high-pressure liquid or gas into the fishing tool to make the fishing tool move upward to achieve the separation of the fallen object from the fishing tool. 3. Press down the pipe string and then lift it to separate the fallen object from the fishing tool.
[0005] Although the existing retrievable fishing tools can retrieve downhole fallen objects and also have the characteristic that the fishing tool and the fallen object can be separated, such structures are usually relatively complex. If the fallen object is too heavy, the pressure may not be enough and the stuck release may fail. Therefore, a simpler structure still needs to be designed to meet the working requirements. Summary of the Utility Model
[0006] The purpose of the utility model is to provide a hydraulic retrievable downhole fishing tool that can lift and separate the clamping jaws in the case of a heavy fallen object and is not prone to stuck release failure.
[0007] An embodiment of the utility model is realized through the following technical solutions: A hydraulic retrievable downhole fishing tool includes a housing and a joint jaw cylinder. The joint jaw cylinder is installed in the housing, and the top end of the joint jaw cylinder extends out of the housing. An inner boss is provided in the joint jaw cylinder, and a flow channel communicating with the housing is provided on the inner wall of the joint jaw cylinder above the inner boss; a plug ball is placed in the joint jaw cylinder and is stuck at the inner boss to block the liquid; an elastic limit block is embedded and installed on the inner wall of the housing, and a slot opening matching with the elastic limit block is provided on the outer surface of the joint jaw cylinder; a push ring is arranged between the inner wall of the joint jaw cylinder and the housing, and the push ring is arranged above the elastic limit block and is in contact with it.
[0008] Further, the outer shell includes an upper shell and a lower shell, and the upper shell is detachably connected to the lower shell by threads; the elastic limiting block is installed in the inner wall of the lower shell.
[0009] Further, a claw is provided at the lower end of the joint claw cylinder, and the claw is of a split structure, and a gap is left between adjacent claws.
[0010] Further, a limiting stop bar is provided below the outer shell, and the limiting stop bars are arranged in a criss-cross manner, and the claws pass through the gaps between the limiting stop bars.
[0011] Further, anti-slip claw teeth are provided on the inner side of the claw.
[0012] Further, a plug block is further included, and the plug block is installed on one side of the outlet of the flow channel, and the plug block is connected to the joint claw cylinder by a pin.
[0013] Further, the contact surface between the push ring and the elastic limiting block is a conical surface.
[0014] Further, an outer convex platform is provided at the upper end of the joint claw cylinder, and the size of the outer convex platform is larger than the size of the top orifice of the outer shell.
[0015] The technical solution of the embodiment of the present utility model has at least the following advantages and beneficial effects: Compared with the prior art, the present utility model can drive the push ring to squeeze the elastic limiting block through hydraulic pressure to unlock the joint claw cylinder, and the provided pressure is relatively smaller, and the joint claw cylinder and the outer shell are more easily separated, and it is not easy to have the situation of unlocking failure;
[0016] The joint claw cylinder and the claw are of an integral structure, which is convenient for installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.
[0018] Figure 1 It is a schematic structural diagram before fishing of the hydraulic retrievable downhole fishing tool provided by the embodiment of the present utility model;
[0019] Figure 2 It is a schematic structural diagram of the joint claw cylinder in the present utility model;
[0020] Figure 3 It is a schematic internal structural diagram of the joint claw cylinder in the present utility model;
[0021] Figure 4 The sectional view taken along line A-A in Figure 1 ; the partial enlarged view at position B in
[0022] Figure 5 The partial enlarged view at position C in Figure 1 ; the structural schematic diagram of the lower housing in the present utility model
[0023] Figure 6 The schematic diagram when the hydraulic retrievable downhole fishing tool in the present utility model is put with a plug ball for releasing stuck Figure 1 ; Icon: 1 - housing, 11 - upper housing, 12 - lower housing, 121 - limit retaining rod, 2 - joint jaw cylinder, 21 - outer convex platform, 22 - card slot opening, 23 - flow channel, 231 - plug block, 232 - sealing ring, 24 - inner convex platform, 25 - claw, 251 - anti-slip claw teeth, 3 - plug ball, 4 - push ring, 5 - elastic limit block
[0024] Figure 7 ; Specific embodiments
[0025] Figure 8 ; For the purposes of making the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0026] ; Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but is merely representative of selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model. ; It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0027] ; The following is further described with specific embodiments. Refer to
[0028] ; The following is further illustrated with specific embodiments. Refer to
[0029] ; It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0030] Embodiment
[0031] The following is further illustrated with specific embodiments. Refer to Figures 1-8As shown, this embodiment is a hydraulically retractable downhole salvage tool, including an outer shell 1 and a joint claw tube 2, the joint claw tube 2 is installed in the outer shell 1, and the top of the joint claw tube 2 extends out from the outer shell 1, an inner boss 24 is provided in the joint claw tube 2, and the inner wall of the joint claw tube 2 located above the inner boss 24 is provided with a flow channel 23 communicated with the outer shell 1; a blocking ball 3, which is placed in the joint claw tube 2 and clamped at the inner boss 24 to block the liquid; an elastic limit block 5 is embedded and installed on the inner wall of the outer shell 1, and the outer surface of the joint claw tube 2 is provided with a clamping groove 22 that matches the elastic limit block 5; a push ring 4, which is arranged between the joint claw tube 2 and the inner wall of the outer shell 1, and the push ring 4 is arranged above the elastic limit block 5 and is attached to it; specifically, the salvage tool is first moved above the fallen fish, the outer shell 1 is supported, the top of the joint claw tube 2 is connected to the pipe column, and the downward pressure of the pipe column can drive the joint claw tube 2 to move. The head claw tube 2 extends relative to the shell 1 to grab the fallen fish and clamp it. The further the pipe column is pressed downward, the tighter the grip is. When the slot 22 moves down to the elastic limit block 5 and is locked, it can be moved up to extract the fallen fish. When the fallen fish is too heavy and needs to be abandoned for salvage, a blocking ball 3 is thrown into the pipe column, and the blocking ball 3 falls to the inner boss 24 to block the orifice, and then high-pressure liquid is passed into the pipe column. After the liquid is pressurized, the liquid will enter the flow channel 23 to break the pin connecting the blocking block 231 and the joint claw tube 2, and enter the cavity between the shell 1 and the joint claw tube 2 along the flow channel 23. The hydraulic pressure will drive the push ring 4 to squeeze the elastic limit block 5 radially outward, and then release the lock with the slot 22. At this time, the pipe column drives the joint claw tube 2 to move upward, and the fallen fish can be separated from the salvage tool. The operation is simple and easy. Pumping in liquid only requires applying a pressure that can squeeze the elastic limit block 5 to retract.
[0032] In general, hydraulic retractable salvage tools, high-pressure liquid is injected to move the claw 25 upward to achieve the purpose of unblocking. However, in actual situations, the claw 25 may not be lifted up due to the weight of the fallen fish or the pressure of the liquid itself, resulting in failure of unblocking. The present device uses high-pressure fluid to squeeze the push ring 4 downward, so that the elastic limit block 5 moves to both sides to achieve the purpose of unblocking.
[0033] Reference Figure 1 As shown, the housing 1 in this embodiment includes an upper shell 11 and a lower shell 12, and the upper shell 11 is detachably connected to the lower shell 12 by threads; the elastic limit block 5 is installed in the inner wall of the lower shell 12; specifically, during assembly, the joint claw cylinder 2 can be first installed into the lower shell 12, and then the push ring 4 can be installed, and finally the upper shell 11 can be inserted and threadedly tightened.
[0034] like Figure 2 and Figure 3 As shown, a claw 25 is provided at the lower end of the joint claw tube 2, and the claw 25 is a petal-type structure, with gaps between adjacent claws 25; specifically, the outlet of the lower shell 12 is an inner bevel structure, and the outer side of the claw 25 also has a bevel. When the joint claw tube 2 moves downward, it gathers along the inner bevel, thereby having the ability to clamp and grab fallen fish.
[0035] As Figure 1 and Figure 4 shown, a limiting stop bar 121 is provided below the outer shell 1 in this embodiment, and the limiting stop bars 121 are arranged vertically and horizontally in a crisscross pattern, and the claw 25 passes through the gaps between the limiting stop bars 121; specifically, the limiting stop bars cross to form a cross shape, and the claw 25 passes through the middle of the cross opening, while the rear end of the joint claw cylinder 2 cannot pass through the limiting stop bars, restricting the stroke of the joint claw cylinder 2.
[0036] In order to improve the grasping effect of the claw 25, anti-slip claw teeth 251 are provided on the inner side of the claw 25.
[0037] As Figure 5 shown, this embodiment further includes a plug 231, the plug 231 is installed on one side of the outlet of the flow channel 23, and the plug 231 is connected to the joint claw cylinder 2 through a pin; specifically, in order to prevent the flow channel 23 from leaking liquid or impurities from entering the cavity during normal use, a sealing ring 232 is provided between the plug 231 and the joint claw cylinder 2. After the liquid is pressure-retained, the pin will be broken by the impact, and the plug 231 will fall into the annular cavity formed by the joint claw cylinder 2 and the outer shell 1, and only then can the liquid push the push ring 4 to release the card.
[0038] Referring Figure 6 to the figure shown, the contact surfaces of the push ring 4 and the elastic limiting block 5 are conical surfaces. When the inclined surface of the push ring 4 is extruded, the elastic limiting block 5 will compress the spring and retract into the circumferential groove. In addition, the elastic limiting block 5 can also be other structures including inclined surfaces, as long as the moving direction of the elastic limiting block 5 is perpendicular to the moving direction of the push ring 4 during the downward movement of the push ring 4.
[0039] As Figure 1 shown, an outer convex platform 21 is provided at the upper end of the joint claw cylinder 2, and the size of the outer convex platform 21 is larger than the size of the top hole of the outer shell 1; specifically, when lifting the fish, the pipe string pulls up the joint claw cylinder 2, and the outer shell 1 can be taken out together through the outer convex platform 21.
[0040] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A hydraulic retrievable downhole fishing tool, characterized in that: It includes a housing (1) and a connector claw cylinder (2). The connector claw cylinder (2) is installed inside the housing (1), and the top end of the connector claw cylinder (2) extends out of the housing (1). An inner boss (24) is provided in the connector claw cylinder (2), and a flow channel (23) communicating with the housing (1) is provided on the inner wall of the connector claw cylinder (2) above the inner boss (24). A blocking ball (3), which is placed inside the connector claw cylinder (2) and is stuck at the inner boss (24) to block the liquid. Elastic limit blocks (5) are embedded and installed on the inner wall of the housing (1), and a card slot opening (22) matching with the elastic limit blocks (5) is provided on the outer surface of the connector claw cylinder (2). A push ring (4), which is arranged between the inner wall of the connector claw cylinder (2) and the housing (1), and the push ring (4) is arranged above the elastic limit block (5) and is in contact with it.
2. The hydraulic retrievable downhole fishing tool according to claim 1, wherein: The housing (1) includes an upper housing (11) and a lower housing (12), and the upper housing (11) and the lower housing (12) are detachably connected by threads. The elastic limit blocks (5) are installed in the inner wall of the lower housing (12).
3. The hydraulic retrievable downhole fishing tool according to claim 1, characterized in that: The lower end of the connector claw cylinder (2) is provided with claws (25), and the claws (25) are of a split structure, and a gap is left between adjacent claws (25).
4. The hydraulic retrievable downhole fishing tool according to claim 3, characterized in that: A limit stop bar (121) is provided below the housing (1), and the limit stop bars (121) are arranged in a crisscross manner, and the claws (25) pass through the gaps between the limit stop bars (121).
5. The hydraulic retrievable downhole fishing tool according to claim 3, wherein: Anti-slip claw teeth (251) are provided on the inner side of the claws (25).
6. The hydraulic retrievable downhole fishing tool according to claim 1, wherein: It further includes a blocking block (231), the blocking block (231) is installed on one side of the outlet of the flow channel (23), and the blocking block (231) is connected to the connector claw cylinder (2) by a pin.
7. The hydraulic retrievable downhole fishing tool according to claim 1, wherein: The contact surfaces of the push ring (4) and the elastic limit blocks (5) are conical surfaces.
8. The hydraulic retrievable downhole fishing tool according to claim 1, wherein: The upper end of the connector claw cylinder (2) is provided with an outer boss (21), and the size of the outer boss (21) is larger than the size of the top hole of the housing (1).