Positive lockdown for metal seal

Details Positive lockdown for metal seal Positive lockdown for metal seal

1993-01-26

1994-05-03

Dang, Hoang G.

Wells

Processes

Placing or shifting well part

166115, 166182, 166208, 166217, 166387, E21B 3304

Patent

active

053078799

ABSTRACT:
A casing or tubing hanger has a metal seal which also incorporates a locking device which locks the seal to the wellhead housing. An annular recess is formed in the bore of the wellhead housing. The seal has an energizing ring that moves downward to set the seal. A split lock ring is carried by the assembly and moves between a contracted position to an expanded position located in the wellhead housing recess. A wedge ring is carried above the lock ring by the energizing ring. The wedge ring moves with the energizing ring and has a tapered surface that engages the lock ring to push it to the expanded position when the energizing ring moves to the lower position. The lower portion of the wedge ring has a thickness that is selected so as to allow the lower portion to deflect once the lock ring is in an expanded position. This allows the energizing ring to continue downward movement if necessary to fully set the seal.

REFERENCES:
patent: 4496162 (1985-01-01), McEver et al.
patent: 4595063 (1986-06-01), Lennings et al.
patent: 4751965 (1988-06-01), Cassity
patent: 4900041 (1990-02-01), Hopkins et al.
patent: 4949786 (1990-08-01), Eckert et al.
patent: 5000266 (1991-03-01), Saunders et al.
patent: 5038865 (1991-08-01), Taylor et al.
patent: 5070942 (1991-12-01), McInnes
patent: 5110144 (1992-05-01), Burton et al.
patent: 5174376 (1992-12-01), Lingeltham

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