BORE-HOLE DISCONNECTOR Russian patent published in 2012 - IPC E21B17/06 

FIELD: oil and gas industry.

SUBSTANCE: device includes upper and lower disconnected parts connected by means of a lock with forced collet, which is unlocked with movable sleeve at its movement under action of excessive pressure. Upper end of lower part is equipped with annular slot for a collet. Its lower end has connection thread. Movable sleeve is tightly arranged inside the adapter, fixed in initial position by means of a shear screw and seat for ball thrown off the well mouth. When in initial position the collet projections are pressed on the inner side to the slot of lower part of disconnector by means of cylindrical recess made in the adapter surface. Lock is made in the form of a ball lock inserted into through holes in the adapter. When in initial position the locks are pressed on the outer side with inner annular groove of the collet, and on the inner side with movable sleeve having the possibility of restricted axial downward movement, when in working position, with further falling out of ball locks to cylindrical groove on outer surface of sleeve and axial downward movement of adapter relative to the collet so that interaction of collet projections with external cylindrical recess of adapter and annular slot of lower part of disconnector is stopped. Movable sleeve is located above the seat of the ball and equipped with radial channels.

EFFECT: increasing the disconnection reliability.

2 cl, 1 dwg