Pipe joints or couplings – Frangible element
Patent
1980-12-22
1983-10-11
Arola, Dave W.
Pipe joints or couplings
Frangible element
285 24, 285 39, 285142, 285315, 285321, 166 88, 166217, F16L 3500
Patent
active
044087837
ABSTRACT:
A holddown assembly is mounted on a hanger suspending a string of casing or tubing into a well. A shoulder on the hanger engages a seat in the bore of the wellhead and has passages therethrough for connecting the annular spaces above and below the seat. The holddown assembly includes a rigid, radially expansible locking ring having an upwardly facing tapered surface, and a cam ring having an annular tapered surface for camming cooperation with the locking ring surface. The locking ring is disposed on the hanger shoulder opposite an internal groove in the wellhead. The cam ring threadingly engages the hanger and is releasably attached to the running tool whereby upon rotation of the running tool, the cam ring moves downwardly on the hanger threads and no seals are associated with the holddown assembly. The holddown assembly provides a positive holddown and permits locking the hanger down before, during, or after the cementing operation.
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Arola Dave W.
Conley Ned L.
Robinson Murray
Rose David Alan
Smith International Inc.
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