Down hole electrically operated safety valve
US5070944A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Oct 5, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mechanical actuator operated by electrical power suitable for actuating down hole equipment in a well, e.g. down hole safety valves, has an electric motor, a gear assembly with a mechanical advantage of at least 30:1, a two-part drive sleeve, the parts being connected by, e.g. splines so that the two parts can rotate together while capable of relative axial movement, an actuating sleeve moved axially by rotation of the drive sleeve, and a releasable lock operated by a solenoid to lock the two parts of the drive sleeve against relative axial movement. Rotation of the motor in one direction primes the actuator, rotating in the other direction actuates the equipment and the solenoid-operated releasable lock holds the equipment in the actuating position. If the solenoid is switched off, deliberately or by power failure, the lock is released allowing the equipment to return to its fail-safe position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.