Wellhead blowout preventer with extended ram for sealing central bore
US7552765B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2007 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Jul 30, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A blowout preventer (BOP) is provided in which one of the BOP rams is formed with an extended central bore sealing section to seal across the central bore in a central bore closing position when the polish rod is not present. The ram bores of the BOP are sized to accommodate this extended central bore sealing section in any of the open, sealing or central bore closing positions. The front ends of the BOP rams may be adapted to carry elastomeric or thermoplastic seals to seal against the polish rod or against each other. The central bore seals for the extended central bore sealing section may be formed with elastomeric or thermoplastic seals. In the case of thermoplastic seals, the rams and ram bores are adapted to ensure that the thermoplastic seals are compressed outwardly, to seal the ram bores, or are lifted upwardly, to seal the central bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.