Tool for fishing steel wire rope in drill hole

Abstract

The utility model discloses a tool for fishing a steel wire rope in a drill hole, which relates to the technical field of drill hole fishing equipment and comprises a tool main body connected with a drill rod, a piston rod and a piston head which are connected with each other are arranged in the tool main body, and the piston rod is rotatably connected with a fishing hook extending out of the tool main body. The piston rod is sleeved with a spring, one side of the piston head is arranged to be a first end face bearing hydraulic pressure thrust, and the other side of the piston head is arranged to be a second end face bearing spring thrust. The tool for fishing the steel wire rope in the drill hole has the advantages of being capable of being easily inserted into a steel wire rope group and stable in fixation, and the steel wire rope fishing effect is very good.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling fishing equipment, in particular to a wire rope fishing tool in a drill hole. Background Technique

[0002] The casing drilling system refers to a drilling system that uses ordinary casing as the drill string. The casing not only transmits mechanical energy (torque) but also transmits liquid energy to the drill bit. It can drill while running the casing, saving a large amount of well construction costs, and has the advantages of reducing the number of trips in and out of the well, shortening the time of trips in and out of the well, saving costs, and reducing downhole accidents.

[0003] During the drilling operation, due to various reasons, there are wire rope falling into the well accidents, and workover fishing is required. Traditionally, a fishing hook is generally used to fish for the wire rope, but the wire rope in the well is messy and irregular, resulting in the fishing hook being unable to insert into the wire rope, and the fishing is unsuccessful. Another method is to use a clamp. For example, a tool for fishing a small-diameter drill hole falling wire rope with the application number CN202022865445.X uses a clamp to go deep into the drill hole or well to clamp the wire rope and clamp out the wire rope. However, the wire rope is heavy, and it is difficult for the clamp to clamp the wire rope firmly, and the wire rope is easy to fall off, and it is also easy to have the situation of unsuccessful fishing.

[0004] Therefore, the existing technology needs to be improved. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is that in the prior art, it is not easy to hook the wire rope with a fishing hook, and it is easy to slip off when fishing with a clamp. The purpose is to provide a wire rope fishing tool in a drill hole, which adopts corresponding technical means and has the beneficial effects of being easy to insert into the wire rope group and being firmly fixed, and the effect of fishing for the wire rope is very good.

[0006] The utility model is realized by the following technical solutions:

[0007] A wire rope fishing tool in a drill hole, which includes a tool body connected to a drill pipe. Inside the tool body, there are a piston rod and a piston head connected to each other. The piston rod is rotatably connected to a fishing hook extending out of the tool body. A spring is sleeved on the piston rod. One side of the piston head is set as a first end face for bearing the water pressure thrust, and the other side of the piston head is set as a second end face for bearing the spring thrust.

[0008] In the above technical solution, the wire rope fishing tool in the drill hole is connected to the drill pipe. The drill pipe provides a large water pressure acting on the first end face of the piston head. When the thrust of the water pressure is greater than the thrust of the spring, the water pressure pushes the piston head and the piston rod downward. During the downward movement, the fishing hooks gradually close, facilitating the insertion of the wire rope. After removing the water pressure, the thrust of the spring pushes the piston head and the piston rod upward. During the downward movement, the fishing hooks gradually open, facilitating the catching of the wire rope bundle. Therefore, the fishing hooks are in a closed state before inserting the wire rope bundle, and in an open state after inserting the wire rope bundle, and the effect of fishing the wire rope is better.

[0009] Further, in the present utility model, a first chamber and a second chamber that communicate with each other are provided inside the tool body. The piston rod moves along the first chamber, the piston head moves along the second chamber, and the second chamber communicates with the drill pipe.

[0010] Further, in the present utility model, a sealing ring that abuts against the inner wall of the second chamber is provided on the piston head.

[0011] Further, in the present utility model, a through hole through which the fishing hook passes is provided on the tool body.

[0012] Further, in the present utility model, the size of the inner port of the through hole is larger than the size of the outer port.

[0013] Further, in the present utility model, multiple fishing hooks are symmetrically distributed on both sides of the piston rod.

[0014] Further, in the present utility model, multiple fishing hooks are evenly distributed around the piston rod.

[0015] Further, in the present utility model, a check valve is provided inside the piston head.

[0016] Further, in the present utility model, a conical tip is provided at one end of the tool body away from the connection with the drill pipe.

[0017] Further, in the present utility model, the tool body is threadedly connected to the drill pipe.

[0018] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0019] 1. Easy insertion: The wire rope fishing tool in the borehole is connected to the drill pipe. Before the wire rope fishing tool in the borehole is inserted into the wire rope bundle, the drill pipe provides a large water pressure acting on the first end face of the piston head. The thrust of the water pressure is greater than the thrust of the spring. The water pressure pushes the piston head and the piston rod downward. During the downward movement, the fishing hook gradually closes. After the fishing hook is completely closed, the lateral width of the wire rope fishing tool in the borehole is smaller, and it is easier to insert into the wire rope bundle compared to the fishing hook with a larger lateral width.

[0020] 2. Firmly hooking: After hooking the wire rope, the drill pipe does not provide water pressure. The thrust of the spring pushes the piston head and the piston rod upward. During the upward movement, the fishing hook gradually opens. After the fishing hook is completely opened, the drill pipe moves upward and exits the borehole. Since the fishing hook pulls the wire rope in a hooking form, it is more stable compared to the traditional clamping method, effectively avoiding the wire rope from falling off. Description of the Drawings

[0021] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0022] Figure 1 It is a schematic internal structure diagram of the wire rope fishing tool in the borehole of the present invention when it is closed;

[0023] Figure 2 It is a schematic internal structure diagram of the wire rope fishing tool in the borehole of the present invention when it is open;

[0024] Figure 3 It is a schematic structure diagram of the fishing hook of the present invention.

[0025] Reference numerals in the drawings and corresponding component names: 1 - tool body, 101 - first chamber, 102 - second chamber, 103 - through hole, 2 - piston rod, 3 - piston head, 4 - fishing hook, 5 - spring, 6 - sealing ring. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments and descriptions thereof of the present invention are only used to explain the present invention and do not limit the present invention.

[0027] It should be noted that similar reference numerals and letters represent 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.

[0028] In the description of the embodiments of the present utility model, it should be noted that if terms such as "inside", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is habitually placed during use, it is only for the convenience of describing the present utility model and simplifying the description.

[0029] In addition, terms such as "first", "second", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.

[0030] In the description of the embodiments of the present utility model, "a plurality" represents at least two.

[0031] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components.

[0032] Embodiment

[0033] This embodiment provides a wire rope fishing tool for inside a drill hole, as Figures 1 - 3 shown, and the specific structure is described as follows.

[0034] Please refer to Figure 1 shown. The wire rope fishing tool for inside a drill hole in this embodiment includes five parts: a tool body 1, a piston rod 2, a piston head 3, a fishing hook 4, and a spring 5. The tool body 1 serves as the housing of the wire rope fishing tool for inside a drill hole, provides an installation position for other components, and also plays a certain protective role for other components.

[0035] Furthermore, as Figure 1 shown, the tool body 1 is in the shape of a cylinder made of stainless steel. Inside the tool body 1, there are a first chamber 101 and a second chamber 102 that are interconnected. The diameter of the first chamber 101 is smaller than that of the second chamber 102. The first chamber 101 is located below the second chamber 102, and the second chamber 102 penetrates through the top end of the tool body 1. The inner wall of the second chamber 102 near the top end is provided with internal threads, which facilitates fixing with the drill pipe through a threaded connection. After connection, the second chamber 102 is in communication with the drill pipe. One end of the tool body 1 far from the connection with the drill pipe (i.e., the bottom end of the tool body 1) is provided with a tapered tip, which facilitates insertion into the wire rope mass and has a better use effect.

[0036] In some implementation manners of this embodiment, in combination with Figure 1 and Figure 2As shown, the piston rod 2 and the piston head 3 are both cylinders, and the piston head 3 is fixedly installed on the top of the piston rod 2. The piston rod 2 is installed in the first chamber 101 and can move up and down along the first chamber 101, and the piston head 3 is installed in the second chamber 102 and can move up and down along the second chamber 102.

[0037] Further, three sealing rings 6 are sleeved on the side wall of the piston head 3, and the sealing rings 6 are abutted by the piston head 3 and the inner wall of the second chamber 102. The sealing rings 6 play a sealing role to ensure that the water pressure acts on the piston head 3.

[0038] Furthermore, a spring 5 is sleeved on the piston rod 2. The top end of the spring 5 abuts against the bottom surface of the piston rod 2, and the bottom end of the spring 5 abuts against the step surface at the connecting part of the first chamber 101 and the second chamber 102. The top end surface of the piston head 3 is the first end surface for bearing the water pressure thrust, and the bottom end surface of the piston head 3 is set as the second end surface for bearing the thrust of the spring 5.

[0039] Combined with Figure 1 and Figure 3 As shown, the fishing hook 4 is a bent strip. One end of the fishing hook 4 is a tip, and the other end of the fishing hook 4 is rotatably connected to the piston rod 2. The tool body 1 is provided with a through hole 103 for the fishing hook 4 to pass through. The port size of the through hole 103 facing the inside is larger than the port size facing the outside, which facilitates the movement of the fishing hook 4 to achieve closing or opening.

[0040] Further, as Figure 3 shown, a long strip hole is opened on the fishing hook 4, and a rivet passing through the long strip hole is fixedly installed in the through hole 103. When the piston rod 2 moves up and down, the fishing hook 4 also moves accordingly. Under the limitation of the long strip hole and the rivet, the opening or closing of the fishing hook 4 is realized.

[0041] Combined with Figure 1 shown, in this embodiment, four fishing hooks 4 are provided. Two are installed on the left side of the piston rod 2, and two are also installed on the right side of the piston rod 2. The fishing hooks 4 on both sides are symmetrical to each other.

[0042] It should be noted that in other embodiments, multiple fishing hooks 4 can be evenly distributed around the piston rod 2. After the fishing hooks 4 are opened, it is easier to hook the wire rope mass.

[0043] In some embodiments of this embodiment, the piston head 3 and the piston rod 2 are provided with vertically penetrating holes, and check valves are arranged in the holes. The first chamber 101 is communicated with the outside through the through hole 103 or other means. After the check valve is closed, it plays a role in blocking water, causing the water pressure in the pipe to rise and the water pressure to act on the piston head 3 to compress the spring 5, so that the piston rod 2 moves downward. After the fishing hook 4 completes the work of fishing the wire rope, the check valve is opened to release the water pressure, the piston head 3 returns to its natural position, and the fishing hook 4 opens.

[0044] The working principle of a wire rope fishing tool inside a drill hole of the present utility model is as follows:

[0045] During use, the wire rope fishing tool inside the drill hole and the drill pipe are docked by means of threaded connection. The drill pipe provides a large water pressure acting on the first end face of the piston head 3. When the thrust of the water pressure is greater than the thrust of the spring 5, the water pressure pushes the piston head 3 and the piston rod 2 downward. During the downward movement, the fishing hook 4 gradually closes, as Figure 1 shown. Since the fishing hook 4 is in a closed state at this time, the drill pipe allows the wire rope fishing tool inside the drill hole to easily insert into the dropped wire rope. After insertion, the water pressure is removed, and the thrust of the spring 5 pushes the piston head 3 and the piston rod 2 upward. During the downward movement, the fishing hook 4 gradually opens, as Figure 2 shown, facilitating hooking the wire rope. The upward movement of the drill pipe drives the wire rope to rise, realizing the fishing of the wire rope.

[0046] In summary, the present utility model provides a wire rope fishing tool inside a drill hole, which includes a tool body 1 connected to the drill pipe. Inside the tool body 1, a piston rod 2 and a piston head 3 that are connected to each other are provided. The piston rod 2 is rotatably connected to a fishing hook 4 that extends out of the tool body 1. A spring 5 is sleeved on the piston rod 2. One side of the piston head 3 is set as the first end face that bears the thrust of the water pressure, and the other side of the piston head 3 is set as the second end face that bears the thrust of the spring 5. A first chamber 101 and a second chamber 102 that are interconnected are provided inside the tool body 1. The piston rod 2 moves along the first chamber 101, and the piston head 3 moves along the second chamber 102. The second chamber 102 is communicated with the drill pipe. The piston head 3 is provided with a sealing ring 6 that abuts against the inner wall of the second chamber 102. The tool body 1 is provided with a through hole 103 for the fishing hook 4 to pass through. The size of the inner port of the through hole 103 is larger than that of the outer port. A plurality of fishing hooks 4 are symmetrically distributed on both sides of the piston rod 2. A plurality of fishing hooks 4 are evenly distributed around the piston rod 2. A check valve is provided inside the piston head 3. The end of the tool body 1 far from the connection with the drill pipe is provided with a conical tip. The tool body 1 is threadedly connected to the drill pipe. The wire rope fishing tool inside the drill hole provided by the present utility model has the beneficial effects of being easy to insert into the wire rope group and having a firm fixation, and the effect of fishing the wire rope is very good.

[0047] The above-described specific embodiments have further elaborated on the purpose, technical solution, and beneficial effects of the present utility model. It should be understood that the above is only the specific embodiment of the present utility model and is not used to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A tool for catching wire ropes in a borehole, characterized in that: The invention comprises a tool body (1) connected to a drill pipe, wherein a piston rod (2) and a piston head (3) connected to each other are arranged inside the tool body (1), wherein the piston rod (2) is rotatably connected to a fishing hook (4) extending out of the tool body (1), and the piston rod (2) is sleeved with a spring (5), one side of the piston head (3) is set as a first end face for bearing water pressure thrust, and the other side of the piston head (3) is set as a second end face for bearing the thrust of the spring (5).

2. The wire rope catching tool in a borehole according to claim 1, characterized in that: The tool body (1) is provided with a first chamber (101) and a second chamber (102) which are interconnected. The piston rod (2) moves along the first chamber (101), and the piston head (3) moves along the second chamber (102). The second chamber (102) is connected to the drill rod.

3. The wire rope catching tool in a borehole according to claim 2, characterized in that: The piston head (3) is provided with a sealing ring (6) abutting against the inner wall of the second chamber (102).

4. The wire rope catching tool in a borehole according to claim 1, characterized in that: The tool body (1) is provided with a through hole (103) for the fishing hook (4) to pass through.

5. The wire rope catching tool in a borehole according to claim 4, characterized in that: The size of the inner port of the through hole (103) is greater than the size of the outer port.

6. The wire rope catching tool in a borehole according to claim 1, characterized in that: The plurality of salvage hooks (4) are symmetrically distributed on both sides of the piston rod (2).

7. The wire rope catching tool in a borehole according to claim 1, characterized in that: The plurality of fishing hooks (4) are evenly distributed around the piston rod (2).

8. The wire rope catching tool in a borehole according to claim 1, characterized in that: A one-way valve is arranged inside the piston head (3).

9. The wire rope catching tool in a borehole according to claim 1, characterized in that: The tool body (1) is provided with a conical tip at one end away from the end connected with the drill rod.

10. The wire rope catching tool in a borehole according to claim 1, characterized in that: The tool body (1) is threadedly connected to the drill rod.

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