The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 1995
Filed:
Mar. 30, 1994
Klaus B Huber, Sugarland, TX (US);
Joe C Hromas, Sugarland, TX (US);
A Glen Edwards, Hockley, TX (US);
Schlumberger Technology Corporation, Houston, TX (US);
Abstract
A wellbore tool includes an anchor connected to a perforating gun, the anchor including an anchor slip disposed between upper and lower slip housings for expanding to grip a casing in the wellbore, a primary anchor release mechanism for unsetting the anchor slip and a secondary anchor release mechanism for unsetting the anchor slip when the primary anchor release mechanism is not activated. If the primary and secondary anchor release mechanisms have not been activated, the anchor slip can be set. The primary anchor release mechanism automatically unsets the anchor slip when a detonation wave, conducting in a detonating cord, propagates through an interior space of a frangible member, the detonation wave shattering the frangible member and detonating the perforating gun. When the frangible member is shattered, the anchor slip can then be unset thereby allowing the perforating gun to fall to a bottom of the wellbore. A secondary anchor release mechanism can be used to unset the anchor when the primary anchor release mechanism is not being used. The secondary anchor release mechanism includes a release sleeve adapted to attach to a separate shifting tool, an upset, and a collet finger. A movement of the shifting tool will cause the release sleeve and the upset to move away from the collet finger. When the upset moves away from the collet finger, the anchor slip can be unset without shattering the frangible member of the primary mechanism or detonating the perforating gun.