Cable type downhole descaling device

Abstract

A cable type downhole descaling device comprises a steel brush head, a transmission device, an anchor, an electric motor, a pressure compensator, a controller and a cable joint which are sequentially connected. The cable type downhole descaling device is characterized in that the cable joint is connected with a ground control system through a cable, the controller is used for controlling the working process of the descaling device, the pressure compensator is used for keeping the pressure balance inside and outside the descaling device, and the electric motor is used for providing working power of the descaling device. During working, under the driving of the electric motor, a supporting arm of the anchor stretches, an anchor plate contacts with the inner wall of a casing pipe, the descaling device is firmly anchored on the inner wall of the casing pipe, then the electric motor drives a reciprocating screw and the steel brush head to conduct circumferential rotation and axial reciprocating motions simultaneously, and removal of downhole dirt is achieved through milling of a steel brush disk. The cable type downhole descaling device is simple in structure, convenient to operate, high in operating reliability, capable of effectively finishing descaling operation for downhole tools such as the casing pipe, a safety valve, a sliding sleeve valve and the like.

Description

technical field [0001] The invention relates to a special downhole tool used for oil, natural gas and geological drilling, completion and workover, and is a cable type downhole descaling device used for drilling, completion and workover. Background technique [0002] The scaling problem of oil and gas wells is becoming more and more serious. As the amount of scaling increases, the inner diameter of the casing becomes smaller, which affects the normal production and downhole operations of oil and gas wells, and even causes oil and gas wells to be shut down and scrapped, resulting in huge economic losses. Therefore, it is necessary to The downhole scale is cleaned up. At present, descaling operations are mainly divided into chemical descaling and mechanical descaling: chemical descaling mainly dissolves downhole scales through chemical reagents, so as to achieve the purpose of descaling, but this method is expensive, pollutes seriously, and is easy to corrode downhole applianc...

AI Technical Summary

Problems solved by technology

[0002] The scaling problem of oil and gas wells is becoming more and more serious. As the amount of scaling increases, the inner diameter of the casing becomes smaller, which affects the normal production and downhole operations of oil and gas wells, and even causes oil and gas wells to be shut down and scrapped, resulting in huge economic losses. Therefore, it is necessary to Downhole scale removal

At present, descaling operations are mainly divided into chemical descaling and mechanical descaling: chemical descaling mainly dissolves downhole scales through chemical reagents, so as to achieve the purpose of descaling, but this method is expensive, pollutes seriously, and is easy to corrode downhole appliances ; Traditional mechanical descaling methods use volumetric motors, milling cutters, impact hammers with milling cutters or pure liquid jet technology, because milling cutters and similar cutting tools will inevitably damage casings and downhole appliances during operation , and the size of conventional cutting tools is limited by the diameter of the well, without considering the changes in the inner profile and diameter of the pipeline, it is difficult to adapt to the requirements of downhole operations. At the same time, such tools must rely on pump trucks or overhaul equipment, which is expensive and takes up a long time in the well , Take up a lot of space, easy to damage tools, and low work efficiency

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