METHOD AND APPARATUS FOR ANCHORING A WELLBORE TOOL TO A CASING IN A WELLBORE INCLUDING A PRIMARY AND A SECONDARY ANCHOR RELEASE MECHANISM

摘要

A wellbore tool comprises an anchor apparatus connected to a perforating gun including an anchor slip for expanding to grip a casing in the wellbore when the wellbore tool is disposed in a wellbore, a primary anchor release mechanism for upsetting the anchor apparatus and a secondary anchor release mechanism for upsetting the anchor apparatus when the primary anchor release mechanism was not activated. If the primary and secondary anchor release mechanisms have not been activated, the anchor apparatus can set the anchor slip. The anchor apparatus includes upper and lower slip housings, and an anchor slip disposed between the upper and lower slip housings. Provided both the primary and secondary anchor release mechanisms have not been activated, the anchor slip will expand radially outwardly when the upper slip housing physically approaches the lower slip housing. The primary anchor release mechanism automatically upsets the anchor slip of the anchor apparatus when a detonation wave propagates through a detonating cord, through an interior space of a frangible member thereby shattering the frangible member and detonating the perforating gun. If it is necessary to upset the anchor slip of the anchor apparatus without shattering the frangible member and detonating the perforating gun, a secondary anchor release mechanism includes a release sleeve adapted to attach to a separate shifting tool and an upset. When the shifting tool is attached to the release sleeve, an upward or downward movement of the shifting tool will cause the upset to move away from a first collet finger. When the upset moves away from the first collet finger, the anchor slip can be upset without shattering the frangible member or detonating the perforating gun.