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Pressure shale is shale that has been exposed to high pressures that causes it to fracture, usually into large concave pieces. In mud logging, watching for this type of shale is one method of monitoring for the possibility of drilling into high pressures that might cause a blowout.
A shale gas well high pressure stop valve
The application discloses a high-pressure cut-off valve for shale gas well and belongs to the technical field of high-pressure shale gas exploitation equipment, and mainly solves the problem of overload fracture of a valve core caused by high-pressure unbalanced torque in the prior art. The cut-off valve comprises a valve body, a valve cover and a valve core, the valve body and the valve cover are connected through threads, and the valve core penetrates through the valve cover. The high-pressure cut-off valve can balance the unbalanced torque of high-pressure fluid through the structure of the plugging platform and the gyro-type boss, so that the driving energy consumption of the cut-off valve is reduced and the working efficiency is improved.
Owner:SOUTHWEST PETROLEUM UNIV