Annular wellhead seal
A wellhead structure is described comprising a wellhead housing having an internal landing seat and internal annular gripping and sealing grooves therein above the landing seat, a hanger having a landing shoulder, an upwardly facing shoulder above the landing shoulder, an upwardly extending rim with internal annular gripping and sealing grooves therein and an internal rim tapered surface, an annular space defined between the exterior of the hanger rim and the interior of the housing above the upwardly facing hanger shoulder when the hanger is landed on the landing seat, a sealing sleeve positioned within the annular space with its lower end landed upon the upwardly facing hanger shoulder, and an actuating ring coacting with the sealing sleeve and having an external tapered surface for engaging the interior surface of the rim, a port communicating through the actuating ring, and sealing means above and below the port between the exterior of the actuating ring and the interior of the rim.
- Assignee:
- Cameron Iron Works USA, Inc., Houston, TX
- Patent Number(s):
- US 4749047
- OSTI ID:
- 7134141
- Country of Publication:
- United States
- Language:
- English
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