Selective fire perforating gun switch
US4234768A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1978 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Apr 24, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42D1/055
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A multiple shot selective fire perforating gun for piercing oil field tubular goods, typically during the process of completing an oil or gas well. The perforating gun includes a multiplicity of shaped charges which are fired individually by an associated blasting cap and switch. The switch of all but the lowermost shaped charge is configured to disarm its associated blasting cap until the next lower shaped charge has detonated. The generation of the pressure pulse from detonation of the next lower shaped charge causes a piston in the switch to move to express a stream of flowable material onto a switch actuator which manipulates the switch to place it in an armed condition ready to fire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.