DOWNHOLE VALVE DEVICE FOR AUTOMATIC FLOW SWITCHING Russian patent published in 2024 - IPC E21B34/08 E21B43/12 

FIELD: oil industry.

SUBSTANCE: invention relates to valves for wells equipped with submersible electric pumps. Downhole valve device for automatic flow switching, performing the functions of automatic check and drain valve, comprises a housing with side circulation holes, internal through channel and locking mechanism consisting of piston, nut and tip connected to each other by threads. Spring is installed between housing and piston. Centralizer and rod connected by thread are installed inside the piston. A sealing sleeve and a spring are installed on the rod, wherein the locking mechanism is configured to automatically displace and, by compressing the springs, move the piston, and tightly shut off side circulation holes in the housing, opening the internal through channel for further passage of liquid into the tubing. Locking mechanism is made with possibility to tightly shut off internal through channel due to action of forces of springs, at the same time moving piston downwards, opening side circulation holes of the housing and directing the entire flow—liquid, sand, proppant from the tubing to the annular space of the production string, bypassing the electric centrifugal pump.

EFFECT: elimination of friction and wear of bearings caused by rotation of working elements of the pump, jamming and breakage of the shaft, which increases service life of the pump and increases overhaul period of the well.

1 cl, 6 dwg