Pipe joints or couplings – With assembly means or feature
Patent
1977-04-26
1979-02-06
Arola, Dave W.
Pipe joints or couplings
With assembly means or feature
166 85, 277235R, 285143, 285315, 285321, 285341, 285351, F16L 3500
Patent
active
041381440
ABSTRACT:
A sealing assembly for sealing the annulus between a wellhead and a casing hanger in which the assembly includes a recess for receiving a sealing element in which the recess includes a tapered surface and a tapered seat for coacting with a seal for setting the seal with a small setting force. A resilient sealing element is positioned in the recess and tapers downwardly and outwardly at a lower end. The sealing element is compressed in the recess to form a seal requiring only a low seating load and unseats with a low unseating load. An expandable metal ring is positioned in the lower outside portion of the sealing element to reduce extrusion of the element when set. A non-extrusive protective covering is positioned around the top, the outside and the outer portion of the bottom of the sealing element to protect it as it moves downhole in a well. Various seal modifications provide wedge actuated lip seals to increase the sealing area.
REFERENCES:
patent: 2430623 (1947-11-01), Taylor et al.
patent: 3013830 (1961-12-01), Milligan
patent: 3118682 (1964-01-01), Fredd
patent: 3284088 (1966-11-01), Pippert
patent: 3972546 (1975-08-01), Putch
patent: 4055205 (1977-10-01), Withoff
Arola Dave W.
NL Industries Inc.
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