Surface controlled subsurface safety valve
US4149698A · kind A · utility
26Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1977 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Apr 13, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Disclosed is a surface controlled subsurface safety valve wherein the greater of well pressure and balance pressure assists in closing the safety valve. Well pressure assist for valve closure is obtained without creating additional depth sensitive limitations as the balance pressure approaches zero. Balance pressure assist for valve closure is obtained without well pressure tending to maintain the valve open. This abstract is neither intended to define the scope of the invention, which, of course, is measured by the claims, nor is it intending to be limiting in any way.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.