Multi-use tubing disconnect

Details Multi-use tubing disconnect Multi-use tubing disconnect

E - Fixed Constructions

21

B

E21B 17/02 (2006.01) E21B 17/06 (2006.01) E21B 23/04 (2006.01)

Patent

CA 2315607

An apparatus for disconnecting a bottom hole assembly from a work string, having an upper tool body, a piston biased away from a slidable collet, locking dogs held in engagement with a lower tool body by the slidable collet, and one or more collet fingers holding the collet in place, relative to the upper body. The piston can be hydraulically displaced against the biasing spring, thereby releasing the collet finger, followed by further displacement of the piston to contact the collet, then displacement of the piston and the collet to release the locking dogs from engagement with the lower tool body. A shear pin in the collet can provide a positive pressure indication of release of the disconnect device.

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