Subsea control valve apparatus
US3955623A · kind A · utility
27Cited by
9References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1974 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Apr 22, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/045
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A control valve apparatus adapted to be stationed in a subsea blowout preventer stack and used in connection with a production or drill stem test of an offshore well from a floating vessel, includes a valve section and a control section that are releasably connected together by a latch mechanism. The valve section has one or more fail-close valves for controlling the opening of the well, and the control section and latch mechanism are hydraulically operable for respectively actuating the valves and disconnecting the control section to enable its retrieval to the vessel leaving the valve section in place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.