Method and apparatus for a surface control system for: subsurface safety valves
US4082147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1977 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Feb 24, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Two embodiments of a surface controller system apparatus and their method for use with a surface controlled subsurface safety valve are disclosed. Both surface controller systems are responsive to an emergency shutdown signal for enabling closing of the subsurface safety valve when the well surface safety systems are shut-in. Once the subsurface Safety Valve has been shut-in up the system, the safety control system must be manually reset before the subsurface valve can be reopened. Both safety control system provides an enclosed reservoir or accumulator for receiving the hydraulic control fluid when the subsurface valve closes and for containing well blow-outs through either one or both control fluid conduits operably connecting the controller system with the subsurface valve. The enclosed systems are also arranged that any internal leakage of the surface control system will operate to shut-in the well with the subsurface valve. Undesired pressure buildup, effecting possible operation of the subsurface valve in either of the normal or vent control lines also automatically operates to shut-in the subsurface safety valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.