Metal-to-metal seal casing hanger

Details Metal-to-metal seal casing hanger Metal-to-metal seal casing hanger

1984-06-20

1986-06-17

Novosad, Stephen J.

Wells

Expansible anchor or casing

Set by wedge or cam at any point by drop only

166115, 166217, 166382, 166387, 277116, 2771162, 277118, 277236, 285141, 2853825, E21B 3304, E21B 4000

Patent

active

045950539

ABSTRACT:
A hanger for hanging a string of conduit within a wellhead has a metal-to-metal seal. The hanger has a body that locates within the wellhead and provides an annular clearance between the body and the wellhead. A locking device fits within this clearance to lock the hanger against axial movement. The metal-to-metal seal is an annular ring with inner and outer cylindrical sidewalls. The seal has a cavity into which a wedge ring is driven to urge the sidewalls apart to embed within the hanger body and wellhead bore. The locking device has reacting wedges that urge a split ring outward into engagement with the wellhead. A retaining mechanism is then moved downwardly with the seal to retain the split ring in locking engagement.

REFERENCES:
patent: 3134610 (1964-05-01), Musolf
patent: 4178020 (1979-12-01), Dopyera
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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