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:
Mar. 15, 1994
Filed:
Mar. 16, 1993
Joe C Hromas, Sugar Land, TX (US);
Antoni K Miszewski, Missouri City, TX (US);
Klaus B Huber, Sugar Land, TX (US);
Schlumberger Technology Corporation, Houston, TX (US);
Abstract
An automatic tubing release mechanism is adapted to be disposed in a wellbore between a tubing, on one end, and a perforating gun, on the other end. The release mechanism includes a frangible breakup tube, firing head positioned above the breakup tube, and the perforating gun positioned below the breakup tube when the release mechanism is disposed in the wellbore. A detonating cord is interconnected between the firing head and the perforating gun via the breakup tube. When the firing head detonates the perforating gun, the breakup tube shatters. When the breakup tube shatters: in accordance with one embodiment, a release piston, previously resting on the breakup tube, moves downwardly in response to hydrostatic pressure of wellbore fluid and releases a collet arm which rests against a threaded connection of a housing, the release of the collet arm disconnecting the perforating gun from the tubing, the perforating gun falling to a bottom of the wellbore; or, in accordance with another embodiment, wellbore fluid at hydrostatic pressure enters a plurality of fluid ports and exerts a pressure on an underside of a release piston causing the piston to move upwardly thereby releasing a collet arm which rests against a threaded connection of a housing, the release of the collet arm disconnecting the perforating gun from the tubing, the perforating gun falling to a bottom of the wellbore.