Metal-to-metal/elastomeric pack-off assembly for subsea wellhead

Wells – Packers or plugs – Spaced sealing portions

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Details

166196, 277209, 285140, F21B 3304

Patent

active

047199717

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.

REFERENCES:
patent: 3489213 (1970-01-01), Hutchison
patent: 3797864 (1974-03-01), Hynes et al.
patent: 3871449 (1975-03-01), Ahlstone
patent: 4324422 (1982-04-01), Rains et al.
patent: 4381868 (1983-05-01), Croy et al.
patent: 4416472 (1983-11-01), Fowler et al.
patent: 4469172 (1984-09-01), Clark

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