Centralizing string and restoring string for horizontal well casing pipe dislocation and restoring process of centralizing string and restoring string

Abstract

The invention discloses a centralizing string and a restoring string for horizontal well casing pipe dislocation and a restoring process of the centralizing string and the restoring string so as to solve the problem that existing dislocation wells with the casing pipe dislocation and inner diameter coincidence degree ranging from 30-50% in an oil field are incapable of being centralized and restored. The centralizing string comprises a booster, a hydraulic anchor and an oil pipe, and an eccentricity centralizing hanger, the booster and the hydraulic anchor are sequentially connected through the oil pipe. The restoring string matched with the centralizing string in use comprises an oil pipe and a casing pipe restoring tool which are connected, an insertion pipe is connected at the bottom of a cylinder of the casing pipe restoring tool, and a casing pipe is inserted into an outer positioning cylinder of the eccentricity centralizing hanger. The restoring process is particularly applicable to thermal recovery horizontal well casing pipe dislocation restoring works and similarly applicable to other casing pipe dislocation horizontal wells. The centralizing string and the restoring string and the restoring process can be used for effectively restoring the dislocation casing pipe at a horizontal segment of the horizontal well, have no chemical pollution to an oil layer and are wide in application range, simple in construction steps and capable of effectively reducing production cost.

Description

technical field [0001] The invention relates to tools and techniques for repairing broken casings in oilfield horizontal wells, in particular to straightening pipe strings and repairing pipe strings for horizontal well casings and the repair process thereof, which solves the problem that the coincidence degree of broken inner diameters of casings in oil fields is 30-50 The problem that the error between the % and the well cannot be corrected and repaired. Background technique [0002] Due to the large-scale promotion of horizontal well technology in oil fields, the accompanying management of horizontal wells has become increasingly prominent, and the methods and tools to deal with the problem of casing failure in horizontal wells are not yet comprehensive. There are many difficulties in the problem of casing dislocation in horizontal wells, but they are mainly divided into four aspects. One is the technology of drilling channels and repairing pipe strings before running in;...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide horizontal well casing misalignment, straightening pipe string and repairing pipe string and its repairing process, and to solve the overlap degree of inner diameter of casing misalignment in the oilfield The problem that 30-50% faulty wells cannot be corrected and repaired

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