Multi-use tubing disconnect
AssigneeBaker Hughes Incorporated
InventorsGregory S. Marshall, Daniel R. Hart
Life of this patent
Estimating the term…
Abstract
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.
Claims25
A disconnect device for downhole use in oil or gas wells, comprising:
- an upper tool body;
- a dog housing mountable to said upper body;
- a lower tool body;
- at least one movable dog cried by said dog housing;
- a collet adapted to selectively maintain said at least one dog in engagement with said lower body, thereby preventing longitudinal movement of said lower body relative to said dog housing;
- and
- a piston slidably mounted at an initial position relative to said dog housing, wherein said piston is not in abutment with said collet,
- wherein said piston is hydraulically movable from said initial position to a second position in which said piston abuts said collet to move said collet longitudinally relative to said dog housing to release said at least one dog from engagement with said lower body.
A disconnect device for downhole use in oil or gas wells, comprising:
- an upper tool body;
- a dog housing mountable to said upper body;
- a lower tool body;
- at least one movable dog carried by said dog housing;
- a collet adapted to selectively maintain said at least one dog in engagement with said lower body, thereby preventing longitudinal movement of said lower body relative to said dog housing;
- at least one shear pin attaching said collet to said dog housing;
- and
- a piston slidably mounted at an initial position relative to said dog housing,
- wherein said piston is not in abutment with said collet;
- wherein said piston is hydraulically movable from said initial position to a second position in which said piston abuts said collet to shear said at least one shear pin, and to then move said collet longitudinally relative to said dog housing to release said at least one dog from engagement with said lower body.
A disconnect device for downhole use in oil or gas wells, comprising:
- an upper tool body;
- a locking device mountable to said upper body;
- a lower tool body;
- a collet adapted to selectively maintain said locking device in engagement with said lower body, thereby preventing longitudinal movement of said lower body relative to said upper body;
- at least one shear pin preventing longitudinal movement of said collet relative to said upper body;
- a capture element on said collet for longitudinally capturing said collet relative to said upper body, preventing inadvertent application of shear force to said at least one shear pin;
- and
- a piston slidably mounted at an initial position relative to said upper body,
- wherein said piston is not in abutment with said collet;
- wherein said piston is hydraulically movable from said initial position to a second position in which said piston abuts said collet to shear said at least one shear pin, and to then move said collet longitudinally relative to said upper body to release said locking device from engagement with said lower body.
Dependencies are inferred from the claim text.