Completion reoperation blowout control tail tube valve

Abstract

The invention relates to a completion reoperation blowout control tail tube valve. The completion reoperation blowout control tail tube valve is characterized in that an upper joint and a lower joint are respectively assembled in inner holes of the upper end and the lower end of a coupling to form a valve body shell; an upper valve seat is assembled in a valve body, a step type downward opening blind hole with the small upper end and the large lower end is arranged in an upper valve seat body, the lower end of the blind hole is a screw hole, and a valve seat elastic claw which is in the shape of a lantern framework is arranged on the inner hole wall of the upper portion of the screw hole of the large step hole; a plurality of flow guiding holes communicated with the blind hole are arranged on the upper portion of the upper valve seat; a lower valve seat is in the shape of a hollow step shaft, the lower end of the upper portion of the lower valve seat is assembled in the screw hole of the lower end of the upper valve seat, and the lower end of the lower valve seat is assembled in an inner hole of the lower joint; and a pair of valve clacks is assembled in a hole of the upper portion of the lower valve seat, a resetting spring is assembled between the pair of valve clacks, and center holes of the upper valve seat and the lower valve seat are respectively sealed by valve clack heads of the lower valve clack and the upper valve clack via the resetting spring. The completion reoperation blowout control tail tube valve has functions of well descent blowout control, water transfer injection, counter-circulation well washing and reoperation blowout control, and is simple and reliable in construction process and convenient in field operation.

Description

technical field [0001] The present invention relates to a downhole operation tool for oil and gas and water injection wells, a pre-set plugging tool for the inner hole of the bottom hole under pressure operation, especially a well completion bottom valve that can control the circulation and flow direction of the bottom well fluid: well completion and reoperation Anti-blowout tailpipe valve. Background technique [0002] In the late stage of oilfield (reservoir) management, water injection wells are often used to maintain or restore reservoir pressure and increase formation energy, so that the reservoir has a strong driving force to increase the recovery rate and recovery rate of the reservoir; in the past, a large amount of oil was used in operations For killing hydraulic wells, the residual pressure downhole often poses a safety hazard during operation; if the pressure is released at the wellhead, there will often be sewage recovery, and the formation energy of the surround...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method that overcomes the above-mentioned shortcomings of the prior art, and solves the problem of blockage of the inner hole of the tubing well bottom during the pressurized operation of the pressurized oil and gas well, difficulty in delivery of the plug, low success rate of one delivery, and long operation period. A kind of blowout preventer tailpipe valve for well completion and reoperation that can simplify plugging construction of the original well preset tool for the problem of high cost;

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