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Expansion type fishing pipe

An expandable, outer tube technology, applied in the direction of wellbore/well components, earthwork drilling and production, etc., can solve the problems that the retractable fishing spear cannot be withdrawn, the retractable fishing spear cannot be used, and the construction risk is high, so as to reduce risks, Simple structure and wide application range

Inactive Publication Date: 2017-09-22
XINJIANG GUOLIHENG CLEAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem that the existing retractable fishing spear cannot be applied to the coiled tubing of horizontal wells for unblocking and fishing. When the jamming cannot be released, the retractable fishing spear cannot be withdrawn, resulting in high construction risk.

Method used

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  • Expansion type fishing pipe
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  • Expansion type fishing pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The fixed wing structure is a solid or multi-ribbon structure. The solid structure is to increase the overall weight of the fishing tube structure. If the weight of the drilling tool meets the weight of the lowering, the triangular structure can be used. The fixed wing structure is used to fix the fishing tube, that is, the cylinder liner, the swing rod and other structures, and prevent the internal structure from swinging. The fixed wing structure can be fixed on the internal structure, or can be fixed on the inner side of the outer wall of the outer tube. However, for the convenience of assembly, the fixed wing is not fixed to both of them at the same time.

[0041] The slip is a structure that fixes the drill pipe and the swing rod when the swing rod is opened. Here, a stepped structure (similar to a tap structure) is used.

[0042] The expansion head is a structure connected to the operation of the swing rod. Here, a structure of three swing rods arranged uniformly...

Embodiment 2

[0051] The fixed wing structure adopts a triangular structure, and the slips adopt a fine tooth structure.

[0052] The expansion head is a structure connected to the operation of the pendulum. Here, a structure of five pendulums arranged in a circle is adopted. When the expansion head moves down, the five swing rods are opened to block the fished drill pipe.

[0053] The following is a detailed description of the operation steps for the implementation of the fishing tube:

[0054] 1. Measure the approximate position of the drill pipe by other means before lowering the fishing pipe. If the upper end of the drill pipe is buried or has sundries, it is necessary to carry out the necessary clean water circulation to clean the drilling well, so that the end of the drill pipe is exposed, so as to ensure the normal operation of the fishing pipe.

[0055] 2. Connect the structure with the drilling tool through the variable diameter structure, and lower it into the well through the d...

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PUM

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Abstract

The invention provides an expansion type fishing pipe. The expansion type fishing pipe is characterized by comprising an outer pipe body and a fixture; the fixture is in threaded connection with the outer pipe body and comprises a hydraulic device and at least two swing rods; a slip is arranged on each swing rod; and the hydraulic device is used for pushing the swing rods to clamp the inner wall of the pipe through the slips. According to the technical scheme, the success rate of fishing a drill rod, or an oil pipe or a coiled tubing can be increased; the expansion type fishing pipe is suitable for various drilled wells and wide in application range; the structure is simple, recycling can be achieved, and the cost is reduced; and operation is easy, and the risk in the fishing process is reduced.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to an expandable fishing pipe. Background technique [0002] During the drilling process, due to operational errors or other reasons, the drill pipe or coiled tubing may fall into the well, affecting subsequent construction or drilling use. Therefore, it is necessary to salvage the dropped drill pipe or coiled tubing. [0003] At present, drilling and salvage uses fishing pipes that are basically of an external clamping structure. The structure is to clamp the outer side of the drill pipe or oil pipe to be fished. Since this structure acts on the outer wall of the fished object, the structure and shape of the outer wall of the fished object are generally different. The regularity leads to a high error rate of fishing pipes, which in turn leads to other related problems, resulting in increased construction risks. [0004] The following is the prior art most similar to t...

Claims

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Application Information

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IPC IPC(8): E21B31/20
CPCE21B31/20
Inventor 徐斌邢浩杜慧华徐军
Owner XINJIANG GUOLIHENG CLEAN ENERGY TECH CO LTD