Electrically actuated safety valve for a subterranean well
US4796708A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1988 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Mar 7, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole safety valve for a subterranean well comprises an axially shiftable valve head which is movable between open and closed positions by an actuating member. The actuating member is axially shifted by a device mechanism which is manipulated by an electric motor. The electric motor is preferably actuated by downhole batteries and the energization and de-energization of the electric motor is preferably controlled from the well surface by electromagnetic waves. A locking mechanism engages the actuating member of the safety valve in its open position through the energization of an electric solenoid, also preferably controlled from the well surface by electromagnetic waves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.