BAILER TO PLACE SEPARATION PLUGS IN WELL Russian patent published in 2004 - IPC

FIELD: oil and gas production, construction and repair of wells. SUBSTANCE: invention can be employed to place separation plugs for isolation of producing horizons and sections of shafts one from another. Bailer includes body, sealing member, catch and detaching mechanism. Technological annular grooves, upper and lower holes are made in body in agreement with invention. Rest carrying spring and rigid centralizers is mounted on body for axial and rotary movement. Sealing member is additionally equipped with spring limiter from beneath and location cylinder with external annular groove from above. Axial movement of sealing member with regard to body is limited by catch. Catch comprises stoppers and outer sleeve. Stoppers are inserted into lower technological holes of body and interact with external annular groove in location cylinder. Outer sleeve is put on body for axial movement and interacts with stoppers with internal surface of variable section. Outer sleeve is fixed relative to body by locking member. Detaching mechanism includes cylinder with lockpin, adjusts axial movement of rest. Cylinder is mounted on rest for rotary movement. Lockpin interacts with technological annular grooves which are so cut that lockpin can move only in one direction in case of reciprocating motion of rest with reference to body. Last technological annular groove with which lockpin interacts is longer than others. EFFECT: simplified manufacture and preparation of bailer for application, reliable placement of separation cement plug in required interval only. 3 dwg