Casing tension retainer
Patent
·
OSTI ID:5981077
In a wellhead housing having an axial bore, an apparatus is described for supporting a string of casing, comprising in combination: a set of parallel annular wickers formed in the bore of the wellhead housing; a casing hanger having a lower end secured to the string of casing; a load ring mounted to the exterior of the casing hanger, the load ring being split, resilient and outwardly biased for movement between a retracted position and an expanded position in engagement with the wellhead housing; a set of parallel annular wickers formed on the load ring for meshing with the wickers in the bore of the wellhead housing when the load ring moves to the expanded position; a conical load shoulder formed on the casing hanger for contact with the load ring when the load ring moves to the expanded position, to transmit downward load on the casing hanger through the load ring to the wellhead housing; and retaining means for retaining the load ring in the retracted position until the casing hanger reaches a selected position in the wellhead housing, then for releasing the load ring to engage the wellhead housing to support the casing hanger with the casing in tension.
- Assignee:
- ABB Vetco Gray lac., Houston, TX (United States)
- Patent Number(s):
- A; US 5240076
- Application Number:
- PPN: US 7-670678
- OSTI ID:
- 5981077
- Country of Publication:
- United States
- Language:
- English
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