DISCONNECTING DEVICE FOR PIPE STRING Russian patent published in 1998 - IPC

FIELD: construction and repair of wells in oil and gas industry. SUBSTANCE: pipe disconnectors are used primarily at cementation of tail-pieces in vertical, inclined and horizontal wells. Device has upper and lower telescopically connected bodies, stops located in corresponding recesses of bodies, and pushers with detents. Bodies are installed at clearance relative to each other which forms chamber, and upper part of it incorporates pusher with bevelled end, and located in its lower part are spring-loaded detents made in the form of tooth. Detent presses pusher through its idle surfaces. Stops are made in the form of rectangular prism with inclined surfaces of inclined faces for interaction with bevelled surfaces of pushers. Made under inclined surfaces of stops are recesses according to configuration of detent tooth for interaction with detents. EFFECT: high efficiency. 5 dwg