Patent ID: 8991489
Filing Date: 2015-03-31
Classification: E21B

Abstract:
1. A disconnect tool for use in a string of tubulars, comprising: a tubular mandrel having a threaded inner surface; a tubular housing having a plurality of openings formed radially through a wall thereof; an arcuate dog disposed in each opening, each dog having an inclined inner surface and a portion of a thread corresponding to the mandrel thread and radially movable between an engaged position and a disengaged position, wherein: thereby transferring torque between the housing and the mandrel; a tubular sleeve longitudinally movable between a locked position and an unlocked position and having an inclined outer surface for engagement with the inclined inner surface of each dog, wherein: a first spring biasing the sleeve toward the locked position; second springs, each second spring biasing the respective dog toward the disengaged position; and an actuator comprising: