Wellhead annular seal
Patent
·
OSTI ID:6658428
An annular seal is described for sealing across the annular space between a wellhead housing and a hanger positioned within the housing comprising: an annular seal ring having a central ring with upper inner and outer rims and lower inner and outer rims, the upper inner and outer rims being spaced apart and the lower inner and outer rims being spaced apart, an upper wedge ring having a portion thereof projecting into the space between the upper rims and being wider than such space so that when moved fully into the space between the rims it wedges the rims outwardly for sealing engagement with inner and outer surfaces, a lower wedge ring having a portion thereof projecting into the space between the lower rims and being wider than such space so that when moved fully into the space between the rims it wedges the rims outwardly for sealing engagement with inner and outer surfaces, the free outer diameter of the sealing portions of the outer rims having a diameter less than the outer diameter of the lower wedge rings, means coacting with the seal ring and the wedge rings to retain the rings in assembled position, an actuating ring interengaged with the upper wedge ring and movable to provide a relative movement between the wedge rings and the seal ring and also to provide movement of the wedge rings and the seal ring into their ultimate sealing positions, and means for releasably securing the annular seal to the hanger until the rims are in their sealing position and then to release to allow movement of the annular seal on the hanger to position the rims against their respective sealing surfaces on the hanger and the wellhead housing.
- Assignee:
- Cameron Iron Works USA, Inc., Houston, TX
- Patent Number(s):
- US 4766956
- OSTI ID:
- 6658428
- Country of Publication:
- United States
- Language:
- English
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