Valve assembly for hydrocarbon wells
US6695049B2 · kind B2 · utility
49Cited by
17References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Jul 9, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A valve assembly for hydrocarbon wells comprises a first valve (e.g., a conventional gate valve) and a second valve (e.g., a hydraulically operated, fail safe check valve). The second valve provides an alternative to the pressure barrier conventionally formed by a downhole annulus safety valve. It is installable/retrievable through the first valve using a tool of the type used for installation of surface wellhead VR (valve replacement) plugs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.