Method and apparatus for firing borehole perforating apparatus
US4770246A · kind A · utility
7Cited by
17References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Aug 11, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11852
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Method and apparatus for firing perforating apparatus in a borehole. A pressure actuated firing assembly is run into the borehole on th eend of a cable and latched onto a perforating apparatus. The cable is removed and pressure is applied to the tubing annulus. At a predetermined pressure the firing asembly is armed. After arming pressure is released from the tubing annulus during a time delay period before the firing assembly impacts a percussion firing head to thereby detonate the perforating apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.