DISCONNECTOR Russian patent published in 2007 - IPC E21B17/06 E21B33/14 

FIELD: drilling equipment, particularly devices to lower grouted and non-grouted casing pipe sections (casing pipe extensions) in wells of all types.

SUBSTANCE: disconnector comprises load-transfer sub adapted to receive locking member in working sub position. The sub is located inside main funnel and is connected thereto by means of row of ball locks. The sub connection comprises means to attach thereof to drill string from the first sub side and to extension pipe from another sub side. The sub is provided with emergency releasing unit made as additional funnel and through bush. Additional funnel is located from the side of sub connection with main funnel edge connected with additional funnel by means of left-hand threaded connection and provided with connection means, which connects casing pipe extension. Through bush comprises groove made in outer surface thereof and mating ball lock row. Lower through bush part has constricted area made as locking member seat. The through bush is fastened inside load-transfer sub by means of shear pins to provide ball lock fixation in transport position.

EFFECT: possibility of disconnector usage for emergency release and increased load-bearing capacity thereof.

6 cl, 1 dwg