Subsurface tubing safety valve
US5465786A · kind A · utility
29Cited by
10References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 27, 1994 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | May 27, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is disclosed a subsurface safety valve which is adapted to be installed in a tubing string within a well bore and of a type which remains open only so long as a controlled condition is maintained. Also disclosed are several embodiments of a mechanism for holding a rotary control rod of such a valve or other apparatus in a desired rotational position to maintain it open, or otherwise in a desired state, and then releasing it, upon loss of the controlled condition, for return to its original rotational position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.