Down-hole manual blowout prevention switch valve

Abstract

The invention provides a down-hole manual blowout prevention switch valve, which comprises an upper joint, a pressure relief plug, a baffle ring, a main body, a core shaft, a transmission pin shaft, avalve element, a valve seat, a tongue plate and a lower joint. The upper joint is arranged at the upper end of the cylindrical main body, and the pressure relief plug and the baffle ring are arrangedon the side wall of the upper joint; the valve element and the sleeve-shaped valve seat are arranged on the lower part of the main body; the valve element is located on a step arranged on the sleeve-shaped valve seat, that is, the transmission pin shaft and the tongue plate capable of conducting rotary closing around the transmission pin shaft are arranged on the step to serve as valve plates; the tongue plate sleeves the transmission pin shaft through a fixed pin shaft and closes or opens the valve around the transmission pin shaft; the lower end of the main body is connected with the lowerjoint; and the core shaft servers as an inner sleeve, when moving downwards, the core shaft can push the tongue plate away and supports the tongue plate so as to enable the valve to be opened, and when the core shaft moves upwards, the tongue plate loses supporting and rotationally resets under the effects of the transmission pin shaft and a torsional spring so as to close a whole channel.

Description

technical field [0001] The invention relates to the technical field of blowout prevention in oil production pipes, in particular to a downhole manual blowout prevention switch valve, a downhole manual full-bore inner blowout prevention tool or a manual float 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 operators. With...

AI Technical Summary

Problems solved by technology

[0005] The technical task of the present invention is to address the above deficiencies and provide a manual downhole blowout prevention switch valve to solve the problem of allowing the ground manual opening and closing of the internal blowout prevention tool to better meet the use requirements of pressure and fracturing operations

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