Wellhead seal device to seal casing
US8960276B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2011 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Mar 21, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wellhead seal device forms metal seals in an annular space between inner and outer tubular members such as a rough casing held within aligned casing and tubing heads. An annular metal sealing sleeve has a lower portion seated in the annular space, and an upper portion which forms an inner sealing annulus adjacent the outer wall of the inner tubular member. A metal seal ring and a wedge ring are located in the inner sealing annulus. A retaining ring is retained by the upper portion above the wedge ring. Threaded seal energizing members extend through the retaining ring to push downwardly on the wedge ring and compress the metal seal ring radially inwardly to form a metal seal to the inner tubular member and thus seal the inner sealing annulus. The lower portion of the annular metal sealing sleeve may seal to the casing head and to the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.