Using method of safety joint in loosen sand type oil well

Abstract

The invention relates to a using method of a safety joint in a loosen sand type oil well. The safety joint comprises an upper joint and a lower joint, the lower joint is connected to the lower portionof the upper joint, and a sealing steel tube sleeves the outer side of the upper joint; a shear ring is arranged between the sealing steel tube and the upper portion of the upper joint, a safe shearpin is arranged on the upper portion of the shear ring, and a sealing piston is arranged between the sealing steel tube and the lower portion of the upper joint; the sealing piston is connected with the lower portion of the upper joint through a reverse buckle, an impacting cavity is formed between the shear ring and the sealing piston, and a loosen sand hole is formed in the lower portion of thesealing steel tube. The using method comprises the advantages that sand blocking can be blocked, a tube column can be safely lifted, overhaul of the oil well is avoided, and a sand-proof tube can be directly pulled out under multiple conditions; the problem in the prior art that the sand-proof pipe is mostly taken out in sections, the operation is simple, and both time and labor are saved.

Description

technical field [0001] The invention relates to a petroleum downhole operation device and method, in particular to a method for using a loose sand type petroleum downhole safety joint. 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 ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at the above-mentioned defects existing in the prior art, and to provide a method for using a loose sand-type petroleum downhole safety joint, which can solve sand jams, enable the pipe string to be raised safely, prevent oil well overhaul, and can be used in various situations. Pull out the sand control pipe directly, which solves the current problem of taking it out in sections. The operation is simple, saving time and effort

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