Monomer limiting type down-hole sand jetting prevention stopper

Abstract

The invention discloses a monomer limiting type down-hole sand jetting prevention stopper which comprises a valve body, a suspension assembly and a stopper assembly. The stopper assembly is arranged in an inner cavity of the valve body, and the peripheral wall of the upper end of the stopper assembly is temporarily and fixedly connected with the valve body through a shearing pin, an annular part is formed between the inner wall of the valve body and the lower half section of the stopper assembly, and the suspension assembly is installed at the portion, between the inner wall of the valve body and the stopper assembly, at the bottom of the annular part. Zero-pressure non-jetting and non-overflowing of a tubular column at the upper portion of a tool are achieved, safety and controllability of lowering a drill are ensured, and the problem that a drill cannot be lowered when jetting and overflowing of the tubular column are caused due to the wellhead pressure condition of the snubbing service is solved. After the drill reaches the design position, hydraulic force is used for opening an overflowing channel, and construction of sand jetting or well washing or acidification or sand prevention or other follow-up technologies can be completed.

Description

technical field [0001] The invention relates to an auxiliary downhole tool for snubbing operation in an oil field; in particular, it is a single-limited downhole anti-blowout and sand-washing plug. Background technique [0002] According to the survey, before 2010, during the workover of oil-water wells in the high-pressure and low-permeability reservoirs of Zhuangxi Oilfield, the cycle of conventional sand washing, wellbore cleaning and production stimulation operations was obviously too long, and the operation period of conventional well killing The environmental protection pressure is high, and the formation does not supply liquid frequently after operation, resulting in production reduction and shutdown of oil wells. The reason for the analysis is that the brine and mud entering the well fluid during the operation pollute the formation. In order to better protect oil and gas reservoirs from pollution and damage from external water sources, new snubbing equipment and rel...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a single-limited downhole anti-blowout and sand-washing plug. After the process pipe string is connected to the downhole anti-blowout and sand-washing plug, the upper part of the tool string can be realized with zero pressure and no overflow, ensuring the safety of drilling. control, to solve the problem that the pipe string overflows and cannot be drilled when the wellhead is under pressure in the snubbing operation

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