Hydraulic expandable liner hanger provided with double-safety releasing gadget

Abstract

The invention discloses a hydraulic expandable liner hanger provided with a double-safety releasing gadget. The hydraulic expandable liner hanger comprises an expansion base tube, an expansion cone and two hydraulic cylinders, wherein the expansion base tube, the expansion cone and the hydraulic cylinders are mounted on an inner tubing string in a sleeving manner sequentially; a ball socket and a ball assembly re arranged in the top end of the expansion cone, and the upper end of a ball is connected with the lower end of one hydraulic cylinder; a liquid injection hole is formed in the top surface of the hydraulic cylinder at the upper end; the upper end of the inner tubing string is connected with an upper adaptor connector; the lower end of the expansion base tube is connected with a releasing coupling; a collet is mounted in the releasing coupling in a sleeving manner, a releasing body is connected into the upper part of the collet, and the lower end of the inner tubing string is connected into the upper part of the releasing body; an outer slide bushing and an inner slide bushing are mounted inside and outside the inner tubing string respectively in a matched and sleeving manner; a pressure relief hole is formed in one side wall of each of the inner slide bushing, the outer slide bushing and the inner tubing string; a conical pin seat is connected into the lower end of the releasing body; a core tube is arranged in the conical pin seat and the releasing body in a matched manner, the upper end of the core tube is propped against the lower end of the inner slide bushing, and the lower part of the core tube is integrally connected with the conical pin seat through a shear pin; a thrust disc is arranged in the lower end of the collet and connected with the lower end of the core tube.

Description

technical field [0001] The invention relates to an expansion liner hanger with a hydraulic double drop mechanism. Background technique [0002] The expandable liner hanger expands the hanger body made of expandable tubing outwards through hydraulic or mechanical force, so that it forms a firm anchor connection with the casing of the upper level, so as to realize the suspension of the liner. The appearance and development of the expandable liner hanger is a great progress of the liner hanger technology, which has shown a strong development momentum and has attracted the attention and attention of the petroleum engineering field. [0003] At present, there are many kinds of domestic expansion liner hangers, each with its own characteristics, but they all use the principle of expansion. The expansion liner hanger of Shengli Oilfield Drilling Institute adopts the bottom-up expansion mode, which can move the pipe string up and down and rotate the whole pipe string during the pip...

AI Technical Summary

Problems solved by technology

[0004] Even so, there are still some deficiencies in the existing expandable liner hangers, 1, the expansion force is insufficient; 2, there is a pressure-suppressed sealing problem; 3, the expansion method adopts a bottom-up mode, and there is a safety risk

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