Casing tensioning mechanism for a casing hanger
Patent
·
OSTI ID:5260277
This paper discusses a wellhead housing having an axial bore, an apparatus or supporting a string of casing. It comprises a set of circumferential wickers formed in the bore of the wellhead housing; a casing hanger having a lower end secured to the string of casing; at least one load carrying member mounted around the exterior of the casing hanger; the load carrying member having a set of circumferentially extending wickers formed on its exterior for engaging the wickers in the bore of the wellhead housing; the exterior of the casing hanger having a recess for carrying the load carrying member, the recess having upper and lower shoulders, the upper shoulder facing downward and outward, the lower shoulder facing upward and inward and being parallel to the upper shoulder; the load carrying member having upper and lower parallel ends for mating with the shoulders of the recess and being movable from a retracted to an extended position; spring means for urging the load carrying member to the extended position; retaining means for retaining the load carrying member in the retracted position until the casing hanger reaches a selected position in the wellhead housing, then for releasing the load carrying member to engage the wellhead housing to support the casing hanger; and a seal assembly installed between the casing hanger and wellhead housing above the load carrying member after the load carrying member engages the wellhead housing and the casing has been cemented.
- Assignee:
- Vetco Gray, Inc., Houston, TX (USA)
- Patent Number(s):
- A; US 5002131
- Application Number:
- PPN: US 7-466985
- OSTI ID:
- 5260277
- Country of Publication:
- United States
- Language:
- English
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