Wellhead safety valve control system
US6116268A · kind A · utility
13Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1998 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Nov 17, 2018 |
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 utilised 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.