Electrically-driven labor-input type casing milling and fishing combined tool

Abstract

The invention relates to the technical field of petroleum and natural gas drilling engineering, in particular to an electrically-driven labor-input type casing milling and fishing combined tool. The problem that a throttler cannot be withdrawn due to sand accumulation of the throttler, breakage of a clamping jaw, failure of a sealing rubber sleeve and the like can be solved. According to the technical scheme of the electrically-driven labor-input type casing milling and fishing combined tool, during fishing, firstly a fishing tool descends into a well by a specified depth, an anchoring part anchors the whole fishing tool, an axial feeding part and a power part cooperatively drive a casing milling and fishing part to mill accumulated sand hard blocks or broken clamping jaws around the throttler, and after unclamping succeeds, fishing treatment is carried out on the throttler; and if multiple fishing is invalid, the axial feeding part and the power part cooperatively drive the casing milling and fishing part to release, and in the whole process, the underground condition is judged by detecting the current change of a motor. The tool is simple and compact in structure, low in cost andbeneficial to fishing the throttler which cannot be fished by a conventional fishing cylinder.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling engineering, in particular to downhole fishing equipment for oil and gas wells, in particular to an electric-driven labor-intensive casing milling and fishing combination tool. Background technique [0002] Oil and gas well production involves different types of downhole tools. As a kind of downhole tool, the downhole choke can effectively solve the problem of bottomhole fluid accumulation caused by insufficient downhole pressure in the production process, improve the liquid carrying capacity, and at the same time effectively prevent the formation of natural gas hydrate, avoid the construction of ground facilities and guarantee To ensure the safety of personnel in the production process. However, due to the life of the downhole choke, unreasonable choice of choke, process design of the choke, unreasonable handling of materials, placement of the choke, unstable salvage construction, s...

AI Technical Summary

Problems solved by technology

However, due to the life of the downhole choke, unreasonable choice of choke, process design of the choke, unreasonable handling of materials, placement of the choke, unstable salvage construction, sand production in the wellbore, serious fluid discharge, and the time for opening and closing the well is limited. Frequency and other reasons cause the throttle to fail and need to be replaced

[0003] The fishing tool is a kind of downhole equipment that salvages the choke out of the well in some way. According to the field application, during the salvage process, the fish head of the choke is rusted and cannot be grasped firmly, and the fish head is not rusted. However, problems such as damage to the joints of the claws, sand accumulation on the upper end of the restrictor, aging and loss of elasticity of the seal rubber cartridge of the restrictor cannot be salvaged.

Coiled tubing operation can effectively solve the problems, but the cost of one operation is expensive, and there are tens of thousands of wells in the oil field, so it cannot be widely promoted

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