Spear type blow out preventer
US7694730B2 · kind B2 · utility
41Cited by
14References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 18, 2005 |
| Grant date | Apr 13, 2010 |
| Priority date | — |
| Expiry date | Nov 4, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/126
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A blow out preventer for operating between a spear of a tubular gripping tool and a tubular gripped by the tool includes: an expandable seal carried on the spear and expandable to seal between the spear and the tubular's inner wall, the expandable seal being operable as a back up to a primary seal operable between the spear and the tubular's inner wall. A tubular gripping tool and a method may include the blow out preventer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.