Hydraulic returnable fishing socket for coiled tubing

Abstract

The utility model discloses a hydraulic returnable fishing socket for a coiled tubing, which comprises a mandrel, an upper joint is mounted at one end of the mandrel, a slidable moving part is mounted at the other end of the mandrel, a slip is mounted on the moving part, an outer barrel is mounted outside the moving part and the slip, and the hydraulic returnable fishing socket is mainly used for being matched with the coiled tubing for use. Meanwhile, the small-diameter throttling nozzle can provide high-speed jet liquid, settled sand, scaling, wax precipitation and other fish attachments on the periphery of the falling object can be washed away, the success rate of the falling object entering the fish is increased, and once the falling object enters the fish, the falling object can be fished out by lifting the tool; if midway emergencies such as serious sand burying of falling objects, clamping of the falling objects by other tool accessories and exceeding the salvage lifting force limit, the steel ball can be put in, so that the piston moves upwards, the slip is driven to move upwards to be separated from the falling objects, the salvage tool is pulled out, and secondary underground accidents are prevented.

Description

Technical Field

[0001] The utility model relates to the field of fishing tools for oilfield petroleum engineering, in particular to a hydraulically retractable fishing tube for a continuous oil pipe. Background Art

[0002] Existing salvage tools rely on mechanical means to salvage by lifting and lowering the pipe or rotating the pipe, but the coiled tubing cannot be salvaged by lifting and lowering the pipe or rotating the pipe due to its own particularity. In addition, due to the particularity of the well conditions downhole, the force conditions during the salvage of the pipe are relatively complex. Therefore, when using the existing salvage tube to salvage fallen objects, it is impossible to accurately judge whether the salvage tube has entered the fallen object, thereby increasing the salvage cost. When the salvage encounters other situations and needs to be released, the coiled tubing cannot be withdrawn from the salvage tool by lifting and lowering the pipe or rotating the pipe, so it is easy to cause downhole accidents and make the downhole situation more complicated. Utility Model Content

[0003] In view of the above defects or shortcomings, the purpose of the utility model is to provide a hydraulically retractable overshot tube for a coiled tubing.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] A hydraulically retractable overshot tube for a coiled tubing comprises a mandrel, an upper joint is mounted on one end of the mandrel, a slidable movable part is mounted on the other end of the mandrel, a slip is mounted on the movable part, and an outer cylinder is mounted outside the movable part and the slip.

[0006] A throttle nozzle is installed in the core shaft.

[0007] The movable part comprises a piston installed on the slips, a spring is sleeved on the piston, and the other end of the spring is clamped and installed on the upper joint.

[0008] A second O-type sealing ring is arranged between the piston and the core shaft.

[0009] The core shaft is provided with a limiting platform for limiting the piston, and the end of the piston is provided with a clamping groove matched with the limiting platform.

[0010] A third O-type sealing ring is arranged between the limiting platform and the piston.

[0011] A first O-type sealing ring is arranged between the upper joint and the core shaft.

[0012] The diameter of the throttle nozzle is 6 mm.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model provides a hydraulically retractable salvage tube for a continuous oil pipe, which is mainly used in conjunction with the continuous oil pipe to salvage rod-shaped fallen objects. At the same time, a small-diameter throttle nozzle can provide a high-speed jet liquid to clean the sediment, scale, wax and other fish attachments around the fallen objects, thereby improving the success rate of the fallen objects entering the fish. Once the fallen objects enter the fish, a lifting tool can salvage the fallen objects out. If an emergency occurs during the process, such as the fallen objects are severely buried in sand or other tool accessories jam the fallen objects, which exceeds the limit of the salvage lifting force, a steel ball can be thrown in to make the piston move upward, thereby driving the slips to move upward to disengage the fallen fish and pull out the salvage tool, thereby preventing the occurrence of secondary underground accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic diagram of the structure of a hydraulically retractable overshot tube for a coiled tubing.

[0016] In the figure, 1 is the upper joint; 2 is the outer cylinder; 3 is the core shaft; 4 is the piston; 5 is the throttle nozzle; 6 is the slip; 7 is the spring; 8 is the first O-type sealing ring; 9 is the second O-type sealing ring; 10 is the third O-type sealing ring; 41 is the limiter. DETAILED DESCRIPTION

[0017] The utility model will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0018] like Figure 1 As shown, the utility model provides a hydraulically retractable salvage tube for a coiled tubing, comprising: a core shaft 3, an upper joint 1 is installed at one end of the core shaft 3, a slidable movable part is installed at the other end of the core shaft 3, a slip 6 is installed on the movable part, and an outer tube 2 is installed outside the movable part and the slip 6.

[0019] Preferably, a throttle nozzle 5 is installed in the core shaft 3, and the diameter of the throttle nozzle 5 is: 6mm. The utility model adopts a small-diameter throttle nozzle, which can provide a high-speed jet liquid, and can wash away the sand, scale, wax and other fish attachments around the fallen objects, thereby improving the success rate of the fallen objects entering the fish.

[0020] Specifically, the movable parts include: a piston 4 installed on the slip 6, a spring 7 is mounted on the piston 4, and the other end of the spring 7 is mounted on the upper joint 1; a second O-ring 9 is arranged between the piston 4 and the core shaft 3; a limit platform 41 for limiting the position of the piston 4 is arranged on the core shaft 3, and a groove matching the limit platform is arranged at the end of the piston 4.

[0021] Preferably, a third O-ring 10 is provided between the limiting platform 41 and the piston 4 , and a first O-ring 8 is provided between the upper joint 1 and the core shaft 3 .

[0022] The working process of the utility model is:

[0023] When work is needed, the coiled tubing is lowered to the top of the fallen object with a hydraulically retractable salvage tube. The small-diameter throttle nozzle first uses a high-speed jet of liquid to wash away the sand, scale, wax and other fish attachments around the fallen object, and then the salvage tool is lowered to allow the fallen object to enter the inside of the salvage tool; at this time, the tool can be lifted to achieve salvage. If an emergency occurs during the process, such as the fallen object is severely buried in sand, or other tool accessories jam the fallen object, which exceeds the limit of the salvage lifting force, the steel ball can be put in to make the piston move upward, drive the slip upward to disengage the fallen fish, and pull out the salvage tool to prevent the occurrence of secondary underground accidents.

[0024] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred schemes of the present invention. Therefore, the improvements and changes that may be made by those skilled in the art to certain parts of the present invention still reflect the principles of the present invention and achieve the purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. A hydraulically retractable overshot for coiled tubing, characterized in that: include: A core shaft (3) is provided with an upper joint (1) at one end of the core shaft (3), a slidable movable part is provided at the other end of the core shaft (3), a slipper (6) is provided on the movable part, and an outer cylinder (2) is provided outside the movable part and the slipper (6).

2. The hydraulically retractable overshot for coiled tubing according to claim 1, characterized in that: A throttle nozzle (5) is installed inside the core shaft (3).

3. The hydraulically retractable overshot for coiled tubing according to claim 1 or 2, characterized in that: The movable part comprises a piston (4) mounted on a slip (6), a spring (7) being sleeved on the piston (4), and the other end of the spring (7) being mounted on an upper joint (1).

4. The hydraulically retractable overshot for coiled tubing according to claim 3, characterized in that: A second O-type sealing ring (9) is arranged between the piston (4) and the core shaft (3).

5. The hydraulically retractable overshot for coiled tubing according to claim 3, characterized in that: The core shaft (3) is provided with a limiting platform (41) for limiting the position of the piston (4), and the end of the piston (4) is provided with a clamping groove that matches the limiting platform (41).

6. The hydraulically retractable overshot for coiled tubing according to claim 5, characterized in that: A third O-type sealing ring (10) is arranged between the limiting platform (41) and the piston (4).

7. The hydraulically retractable overshot for coiled tubing according to claim 2, characterized in that: A first O-type sealing ring (8) is provided between the upper joint (1) and the core shaft (3).

8. The hydraulically retractable overshot for coiled tubing according to claim 2, characterized in that: The diameter of the throttle nozzle (5) is 6 mm.

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