Using method for sand aeration type safety joint under petroleum well

Abstract

The invention relates to a using method for a sand aeration type safety joint under a petroleum well. According to the technical scheme, the safety joint comprises an upper joint and a lower joint, the lower joint is connected to the lower portion of the upper joint, the outer side of the upper joint is sleeved with a sealing steel bush, a shear ring is arranged between the sealed steel bush and the upper portion of the upper joint, a safety shear pin is arranged on the upper portion of the shear ring, a sealing piston is arranged between the sealing steel bush and the lower portion of the upper joint, and connected with the lower portion of the upper joint through a left-hand thread, an impact cavity is formed between the shear ring and the sealing piston, and a sand aeration hole is formed in the lower portion of the sealing steel bush. The using method has the advantages that the problem of sand blocking can be solved, a tubular pile can be safely lifted out, heavy repair can be avoided for the petroleum well, a sand-prevention tube can be directly pulled out under variable conditions, the problem that under most conditions, the sand-prevention tube is taken out in a segmented mode is solved, operation is easy, and 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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