Safety switch for well tools
US4306628A · kind A · utility
66Cited by
3References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1980 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Feb 19, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/1185
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mechanical safety switch for closing electrical contacts in a well tool. The mechanical switch has several safety requirements which must be satisfied before the electrical contacts will close including upward pull on a wireline and a preselected value of fluid pressure exterior to the switch. The safety switch can be incorporated into a well perforating gun to provide safe, reliable operation of an electrically powered perforating gun by a conventional wireline. Preferably, the electrical circuits of the well perforating gun should include a motion sensor and a timer for increased safety.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.