DEVICE FOR TREATMENT OF BOTTOM-HOLE ZONE Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry, particularly, devices for treatment of bottom-hole zones in cleaning by instantaneous pressure pulses in completion of oil and gas wells. SUBSTANCE: device has hollow body and exhaust channels, spring-loaded bushing, spring-loaded check valve and valve seat. Exhaust channels are made in the form of narrow slots. Bushing lower part has circular projection. Valve is made with axial channel. Valve seat is made in the form of washer with axial longitudinal channels and external threaded surface for engagement with body. Located in axial channel of valve seat is pusher in the form of rod with circular projections on its upper part and two circular projections in lower part. Secured to bushing is pin for longitudinal motion in body exhaust channel. Valve is spring-loaded relative to pusher. EFFECT: more qualitative cleaning of producing formation with the help of pressure pulses of high power. 1 dwg