Wellhead with eccentric casing seal ring
US4771832A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Dec 9, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/0422
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wellhead assembly has a metal seal that accommodates misalignment between casing and the bore of the wellhead housing. The metal seal assembly includes a metal seal ring and a wedge ring. The seal ring has a cylindrical inner wall and a conical outer wall. The centerlines of the inner and outer walls are offset with respect to each other, making the ring eccentric. Similarly, the wedge ring has a conical inner wall and an outer wall. Its inner and outer walls are offset with respect to each other. The rings can be rotated relative to each other and to the casing to coincide the axis of the outer wall of the wedge ring with the axis of the wellhead housing bore. The inner wall of the seal ring has protruding bands which deform as a result of the softness of the metal to enhance sealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.