Pipe joints or couplings – Frangible element
Patent
1980-12-22
1983-11-22
Arola, Dave W.
Pipe joints or couplings
Frangible element
285 39, 285142, 285315, 285321, 285351, 166 88, 166217, F16L 3500
Patent
active
044164726
ABSTRACT:
The holddown and packoff apparatus is disposed on the shoulder of a hanger suspending casing in a well. The shoulder engages a seat in the bore of a wellhead. An expansible metal ring is slideably disposed on the hanger shoulder for engagement with an annular groove in the wellhead. A stop ring is insertable behind the expansible ring to expand and positively hold the expansible ring into holddown engagement in the wellhead groove. An independent sealing assembly is disposed on the stop ring and has one seal for the outer surface of the hanger and another seal for the inner surface of the wellhead. The seals operate in series whereby the sealing engagement of one does not hinder the sealing engagement of the other.
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Fowler John H.
Gruller David L.
Arola Dave W.
Conley Ned L.
Rose David Alan
Shull William E.
Smith International Inc.
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