Redundant firing mechanism for a well perforating gun
US4610312A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1985 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Jun 10, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11852
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A redundant firing mechanism for a perforating gun utilized in subterranean wells comprises a hollow housing assembly incorporating two spaced primer charges disposed in vertically spaced relationship. A fluid pressure chamber is defined within the hollow housing assembly and is closed at the top end of the assembly by a frangible barrier disc. A fluid pressure actuated hammer is provided to impact upon the lowermost one of the primers in response to fluid pressure developed in the fluid pressure chamber. In the event that the lowermost primer does not detonate, a detonating bar may then be dropped through the tubing string to break the frangible barrier and impact upon a second hammer disposed in overlying relationship to the second primer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.