DEVICE FOR REMOVAL OF DRILLING MUD FROM PIPE INTERNAL SPACE IN HOISTING OF DRILL PIPES Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry; applicable in well drilling, in round trip operations. SUBSTANCE: device has branch pipe, check valve, top sub, weights. Branch pipe has bottom sub. Upper sub has tool-joint thread for joining with drill pipe. Branch pipe has channel for pumping of drilling mud. Bottom sub has through channel. Check valve I installed in lower sub and has spring-loaded bushing whose spring is covered with cover. Flexible obturator is secured to branch pipe with fastening nut and made for possible passage of device in case of change of drill pipe inner diameter. EFFECT: provided efficient removal of drilling mud from walls of drill pipes. 1 dwg