Wellhead safety valve control system
US6412510B1 · kind B1 · utility
12Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 29, 2000 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Aug 29, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/777
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A wellhead safety valve control system for opening and closing subsurface and surface safety valves in a predetermined sequence and certain components used with such control system. Dump valves in both latching and non-latching configurations are utilized within the control system. Embodiments of the dump valve may incorporate a time delay feature to ensure the subsurface safety valve is closed after a desired time period following the closure of the surface safety valve in the event of flowline anomalies. Provision is made for independent closure of the surface safety valve without closure of the subsurface safety valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.