Subsea casing hanger packoff assembly
US4815770A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1987 |
| Grant date | Mar 28, 1989 |
| Priority date | — |
| Expiry date | Sep 4, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S285/917
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A packoff assembly for sealing an annulus between an inner tubular member and an outer tubular member including a sealing means rotatably connected to a packing nut. The sealing means includes an upper actuation ring rotatably retained on the packing nut. A sealing member having a ring-like metal body is rotatably mounted on the upper actuation ring with a roller ball connection which permits limited relative axial movement between the upper actuation ring and the sealing member. A lower actuation ring is rotatably mounted on the body of the sealing member by another roller ball connection which permits limited relative axial movement between the lower actuation ring and the body of the sealing member. The metal body of the sealing member includes a pair of frustoconical-shaped outer seal lips and a pair of frustoconical-shaped inner seal lips. An elastomeric seal ring is disposed on the body of the sealing member between each pair of metal seal lips. The upper seal lips of each pair flare upwardly, and the lower seal lips of each pair flare downwardly. The faces of the upper and lower actuation rings which oppose the respective faces of the adjacent metal seal lips are frustonconi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.