Method and apparatus for actuating a differential pressure firing head
US9540913B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 2012 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | Mar 31, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11852
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus are presented for actuating a differential pressure firing head to actuate a perforating gun at a downhole location in a subterranean wellbore adjacent a formation. An exemplary method includes positioning the perforating gun and the differential pressure firing head at a downhole location on a tubing string and then communicating an applied fluid pressure to a wellbore annulus, a first chamber which communicates the applied fluid pressure to a low-pressure side of the firing head assembly, and a second fluid chamber which communicates the applied fluid pressure to a high-pressure side of the firing head assembly. The applied fluid pressure is then trapped within the second fluid chamber. When the applied pressure in the annulus is subsequently removed, a pressure differential is created across the firing head by the low pressure in the first chamber and the trapped applied pressure in the second chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.