Metal-to-metal/elastomeric pack-off assembly for subsea wellhead systems
US4719971A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1986 |
| Grant date | Jan 19, 1988 |
| Priority date | — |
| Expiry date | Aug 18, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/01
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A wellhead system having a casing hanger (C) with a first sealing surface (20) within a wellhead (W) with a second sealing surface (16) spaced from said first sealing surface (20) forming annulus (14) in combination with a pack-off assembly (P) including a wedge ring (42), which in this embodiment, supports a pack-off (64) which has a first metal-to-metal seal (S-1) which sealingly engages the first sealing surface (20) upon initial movement of the pack-off (64) into the annulus (14) and a second metal-to-metal seal (S-1) which sealingly engages the second sealing surface (16) upon further movement of the wedge ring (42) urging said second pack-off seal (S-2) radially outwardly towards the first sealing surface (20). Each metal-to-metal seal may be provided with elastomeric sealing means. Two types of metal-to-metal seals (S-1, S-2) and two types of lock down means, wicker ring (40) and split ring (10), are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.