Down-hole sliding-sleeve-type blowout-preventing switching valve

Abstract

The invention provides a down-hole sliding-sleeve-type blowout-preventing switching valve, which comprises a blowout-preventing switching valve body and a blowout-preventing sliding sleeve body. The blowout-preventing sliding sleeve body is arranged above the blowout-preventing switching valve body to be fixed, and the blowout-preventing switching valve body is internally provided with an anti-abrasion alloy sleeve, a blowout-preventing switching valve seat, a sealing device, a blowout-preventing switching tongue plate, a tongue plate supporting skeleton, a blowout-preventing switching valve sliding sleeve fixing ring, a blowout-preventing switching valve sliding sleeve, a blowout-preventing switching valve lower joint, a dowel and a torsional spring; the sleeve-shaped blowout-preventing switching valve seat is arranged below the anti-abrasion alloy sleeve; a ring-shaped elastic seal is used for sealing and mounting the blowout-preventing switching valve seat onto the blowout-preventing switching valve body, and the dowel and the torsional spring sleeving the dowel are arranged on the blowout-preventing switching valve seat; a dowel hole formed in the blowout-preventing switching tongue plate can rotate around the dowel, the blowout-preventing switching valve sliding sleeve fixing ring is arranged below the blowout-preventing switching valve seat, and the blowout-preventing switching valve sliding sleeve is arranged in the blowout-preventing switching valve sliding sleeve fixing ring in a lined mode; and the blowout-preventing switching valve lower joint is fixed to the lower part of the blowout-preventing switching valve sliding sleeve fixing ring.

Description

technical field [0001] The invention relates to the technical field of blowout prevention in oil production pipes, in particular to a downhole sliding sleeve type blowout preventer switch valve, a downhole full-diameter ball throwing blowout preventer or a downhole safety valve. Background technique [0002] In modern oil and gas production, fracturing is a very effective way to increase production. For low-permeability, tight oil and gas layers and shale oil and gas reservoirs during the reconstruction process, the energy of the formation after fracturing increases and the downhole pressure becomes higher. During the process of tripping the tubing string, a large amount of dirty oil, sewage and associated gas will overflow from the tubing , the overflow in the oil pipe will pollute the well site environment; and make the working environment of employees worse; especially during winter construction, the freezing of the wellhead will increase the difficulty of the wellhead op...

AI Technical Summary

Problems solved by technology

[0005] The technical task of the present invention is to address the above deficiencies, to provide a downhole sliding sleeve type blowout preventer switch valve to solve the problem of making the inner blowout preventer tool better meet the use requirements of pressure and fracturing operations

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