Tubing pressure operated initiator for perforating in a well borehole
US4678044A · kind A · utility
21Cited by
6References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1986 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Mar 31, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11852
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a tubing conveyed perforating gun assembly having shaped charges to perforate a well, an improved pressure sequence shaped charge detonator is included. The preferred form of device is appended to the bottom of the assembly to function as a backup detonator. First and second piston and cylinder assemblies in an elongate body provide pressure initiated arming and subsequent pressure initiated firing pin movement to achieve primer cord detonation for perforation of the well. The pressure sequence is controllable, selectively to a specified pressure to arm and thereafter to fire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.