Casing hanger locking device

Details Casing hanger locking device Casing hanger locking device

1985-09-06

1987-02-10

Novosad, Stephen J.

Wells

Expansible anchor or casing

Liner hanger

166217, 285141, E21B 4310

Patent

active

046417087

ABSTRACT:
A subsea well assembly has a casing hanger that lands inside the wellhead with a locking device to lock the hanger in the wellhead. The locking device includes a collar mounted to the hanger body and movable relative to the body between a lower storage position and an upper set position. The collar contacts a landing shoulder located in the wellhead to move to the set position. Washers located between the collar and the hanger body allow the hanger body to move downward when the collar contacts the landing shoulder. The washers deflect downwardly due to interference fit when the hanger moves to the set position to resist upward movement. As the hanger body moves downward, a split ring is pushed outwardly by inclined surfaces to engage locking grooves formed in the interior of the wellhead for supporting the casing hanger.

REFERENCES:
patent: 2887163 (1959-05-01), McGowen, Jr. et al.
patent: 3507329 (1970-04-01), Stone, Jr.
patent: 3721292 (1973-03-01), Ahlstone
patent: 3736984 (1973-06-01), Garrett
patent: 3893717 (1975-07-01), Nelson
patent: 3918747 (1975-11-01), Putch
patent: 4181331 (1980-01-01), Cowan
patent: 4402773 (1983-09-01), Morrill
patent: 4469172 (1984-09-01), Clark
SG Wellhead Systems Metal-to-Metal Casing Annulus Seal.
The McEvoy "Z-1" Wellhead System.

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