Dump/stop valve for surface controlled subsurface safety valve
US5971353A · kind A · utility
12Cited by
3References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Dec 11, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8663
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Dump/stop valve to regulate the time delay between the closure of a surface controlled subsurface safety valve and a surface controlled surface valve. Fluid is applied to a first cavity above a pilot plunger which maintains the subsurface safety valve in an open configuration. In the event the surface safety valve is intended to be closed, the fluid within the first cavity is bled off by a control circuit which immediately closes the surface safety valve. The pilot plunger responds by allowing the subsurface safety valve to be closed a predetermined and consistent time period thereafter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.