A slip type hydraulic control internal fishing tool

Abstract

The invention relates to a slip type hydraulic control inner fishing tool for fishing underground pipe tools and pipe falling objects in the oil and gas well development process. The slip type hydraulic control inner fishing tool can effectively achieve recycle of the underground pipe tools and fishing operation for the gas falling objects. According to the technical scheme, the upper end of an upper barrel is in screwed connection with a coiled tubing, the upper end of a conical barrel is in screwed connection with the lower end of the upper barrel, the lower end of he conical barrel is in screwed connection with the upper end of a guiding shoe, one end of a connecting rod is hinged to the upper end of a slip, the other end of the connecting rod is hinged to a hinge support at the lower end of a sleeve, a garter spring is installed an arc groove in the outer side of the slip, a spring is installed on a protruding step on the lower portion of the upper barrel, a bearing pedestal and two thrust bearings are integrally arranged in an inner cavity of a thrust shell, one end of a siding pin is in screwed connection with a rotary sealing cover threaded counter bore, and the other end of the sliding pin is inserted into a sliding groove rail on the upper portion of the upper barrel. The slip is hydraulically controlled to be stretched in the radial direction, and it is ensured that fishing is efficient and reliable; slip stretching and retraction can be controlled unlimited times according to operation requirements.

Description

technical field [0001] The invention relates to a slip-type liquid-controlled internal fishing tool for fishing downhole tubular tools and fish falling from the tubulars during the development of oil and gas wells. Background technique [0002] During the development of oil and gas wells, a large number of downhole tools for oil and gas exploitation are used, such as downhole safety valves, downhole chokes, submersible electric pumps and other tools and equipment. After such downhole tools for development have been used for a period of time, the tools need to be salvaged, and how to quickly and effectively salvage the downhole development equipment is a very important task. In addition, in the process of oil and gas drilling and development, there may be accidents of fish falling to the bottom of the well caused by drill strings and tubing breaks. Once such accidents occur, fish must be salvaged. [0003] The principle of salvage operation is to quickly and effectively salv...

AI Technical Summary

Problems solved by technology

However, because it is difficult to penetrate deep into the inner cavity of the fish, the jaws often slip on the top of the fish, resulting in the failure of the fishing operation.

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