Wells – Central chamber sealed with respect to prepositioned...
Patent
1989-06-21
1991-12-31
Dang, Hoang C.
Wells
Central chamber sealed with respect to prepositioned...
166182, 166208, 285140, E21B 3303
Patent
active
050763563
ABSTRACT:
There are disclosed several embodiments of wellhead equipment wherein a seal assembly is installed within a frusto-conically shaped space between the bore of a first wellhead member and a conically shaped surface about a second wellhead member to close same. In one embodiment, the first member is a casing hanger landed within the bore of a subsea casing head, the second member is a tubing hanger within the head, and the seal assembly closes off a space between the bore of the casing hanger and the outer surface of the tubing hanger. In another embodiment, the first member is a surface casing head, the second member is a tubing hanger landed within the bore of the head, and the seal assembly closes off a space between the bore and hanger. In a further embodiment, the first member is a Christmas tree adapter of a surface wellhead landed on a casing head, the second member is a tubing hanger landed in the bore of the head and having an upper extension within a counterbore of the adapter, and the seal assembhly closes off a space between the counterbore of extension.
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Dang Hoang C.
Dril-Quip Inc.
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