3 results about "Pressure shale" patented technology

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.

According to the gas injection, liquid drainage and gas production method for the shale gas reservoir, by means of multi-layer three-dimensional development of fracture network connectivity, a pressurizing well which is multiple in radiation adjacent wells, good in fracture connectivity and low in pressure and yield in a block is preferably selected as a block low-pressure gas injection well, and gas with good permeability is injected (the injected gas comprises but not limited to N2, CO2 and hydrocarbon gas); the gas enters the horizontal section of the adjacent well by means of connectivity cracks through diffusion and propulsion of the gas, accumulated liquid of the horizontal section of the drainage production well is effectively discharged, the drainage production well is activated to continuously produce gas, and the target of gas injection, liquid drainage and gas production is achieved. By means of an existing shale gas fracturing crack communication system, the advantages of an integral gas reservoir box and the intricate well-well relation, the problem of discharging accumulated liquid in a long horizontal section of low-pressure shale gas is solved, and efficient liquid discharging and gas production of a three-dimensional multi-well horizontal shaft of a shale reservoir are achieved through gas injection displacement. Gas injection huff and puff realizes deep liquid drainage and gas production of a reservoir shaft of the gas injection well, the cumulative yield of the gas well is improved, and the gas reservoir recovery efficiency is improved.

According to the technical scheme, the shaft cleaning regulation and control device and method for drainage and gas recovery of the normal-pressure shale gas well are characterized in that the shaft cleaning regulation and control device comprises a ground, a blowout prevention opening is formed in the top of the ground, and a third manual wheel type valve is fixedly installed on the bottom face of the blowout prevention opening; a small four-way pipe is fixedly installed on the bottom face of the third manual wheel type valve, and a junction box is fixedly installed outside the small four-way pipe. The cleaning assembly is arranged on the bottom face of the small four-way pipe and used for cleaning the interior of a shaft, and the cleaning assembly comprises two fourth manual wheel type valves. The device can deal with blockage of solid-phase particles in the shaft in real time, and when the blockage severity exceeds a certain degree and workover operation needs to be conducted, the device can clean the interior of the shaft before the operation is conducted; temporary plug removal is achieved for the shaft and the screw pump, the function of temporarily coping with complex working conditions is achieved, and effective coping can be provided for actual production problems of normal-pressure shale gas.