Automatic tubing release
US5293940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1993 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Mar 16, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/116
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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 co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.