Casing hanger seal assembly with diverging taper
US4960172A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1989 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Aug 18, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A seal assembly for a casing hanger utilizes diverging tapered surfaces. The casing hanger locates within a wellhead housing. The casing hanger has an outer wall spaced inward from an inner wall of the wellhead housing, defining an annular clearance. At least one of the inner or outer walls has a tapered or conical sealing section. The taper is downward, resulting in increased radial width of the annular clearance in a downward direction. A metal packoff locates in the annular clearance. The packoff has inner and outer legs which are spread apart by means of an energizing ring. The legs seal against the casing hanger outer wall and wellhead housing inner wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.