Sand-loosening type petroleum downhole safety connector

Abstract

The invention relates to a sand-loosening type petroleum downhole safety connector. According to the technical scheme, the sand-loosening type petroleum downhole safety connector comprises an upper connector and a lower connector, the lower connector is connected on the lower portion of the upper connector, and the outer side of the upper connector is sleeved with a sealing steel sleeve; a shearing ring is arranged between the upper portions of the sealing steel sleeve and the upper connector, a safety shearing nail is arranged on the upper portion of the shearing ring, and a sealing piston isarranged between the lower portions of the sealing steel sleeve and the upper connector; and the lower portions of the sealing piston and the upper connector are connected through a reversed buckle,an impact cavity is formed between the shearing ring and the sealing piston, and a sand-loosening hole is formed in the lower portion of the sealing steel sleeve. The sand-loosening type petroleum downhole safety connector has the beneficial effects that sand jam is solved, a pipe column can be safely pulled out, oil well overhauling is prevented, a sand control pipe can be directly pulled out invarious situations, the problem that most sand control pipes are taken out in sections at present is solved, operation is simple, and time saving and labor saving are achieved.

Description

technical field [0001] The invention relates to a petroleum downhole operation device, in particular to a loose sand type petroleum downhole safety joint and a method thereof. Background technique [0002] In oil and gas development operations, safety joints are special tools used in downhole operations and production strings. Its function is to disengage the stuck pipe string from the safety joint when an accident occurs in the downhole pipe string, thereby creating good conditions for further handling of the accident. Safety joints are generally used in construction wells with complex string structures and wells with special operation requirements. At present, there are two types of safety joints commonly used in vertical wells: reverse buckle type and shear nail type. The upper joint and the lower joint of the reverse buckle safety joint are connected by left-handed threads. When the pipe string is stuck in the downhole, it is necessary to turn the pipe string clockwise...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the above-mentioned defects in the prior art, to provide a sand-loose oil well downhole safety joint, which can solve the problem of sand stuck, enable the pipe string to be lifted safely, prevent oil well overhaul, and can remove the sand control pipe under various circumstances. Pull out directly, which solves the current problem of taking out in sections, easy to operate, saves time and effort

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