Special eccentric correcting hanger for casing fracture horizontal workover sleeve

Abstract

The invention provides a special eccentric correcting hanger for a casing fracture horizontal workover sleeve, which solves the difficulty that the traditional fractured well with front casing fracture internal diameter coincidence degree of 30-50% in an oil field cannot be corrected. The special eccentric correcting hanger for the casing fracture horizontal workover sleeve comprises a guide head, a hydraulic anchoring hanging device and an eccentric locating and correcting device, which are connected with one another by conversion joints, wherein the hydraulic anchoring hanging device comprises a seat seal locating mechanism and an inserted unsealing mechanism; the seat seal locating mechanism is mounted in the inserted unsealing mechanism and connected by a limiting pin; a counterweight mounting vertical slot is fixedly formed in an inner circle of a circumferential limiting inner cylinder of the eccentric locating and correcting device; a counterweight strip is mounted in the counterweight mounting vertical slot; and the lower end of the counterweight strip is connected with the guide head. After being put into a horizontal well section, one side of the special eccentric correcting hanger mounted with the counterweight strip is always positioned on downside, so that the bottom tip of the guide head can be accurately inserted into a lower casing of the fracture together with the special eccentric correcting hanger according to a preliminary determined casing fracture direction, a restoring passage of the fractured casing is broken through and the production is made again after restoring.

Description

technical field [0001] The invention relates to a channeling tool for a horizontal well with a casing fault in an oil field, especially an eccentric straightening hanger specially used for casing repair of a horizontal well with a casing fault, which solves the current problem of a fault well where the coincidence degree of the internal diameter of the casing fault is between 30% and 50%. A problem that cannot be corrected. 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. The two important difficulties in the problem of casing dislocation in horizontal wells are channel drilling and rerunning of casing repair strings. The current method of repairing faulty wells in vertical wells is to use drillable materials to process ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a special eccentric straightening hanger for casing repairing of horizontal wells with casing misalignment, so as to solve the problem that the current casing misalignment inner diameter coincidence degree is between 30-50% and cannot be corrected. Casing, opening up the repair channel, repairing the horizontal well with deep casing dislocation so that it can continue to produce

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