Wells – Expansible anchor or casing – Liner hanger
Patent
1989-04-07
1990-08-21
Neuder, William P.
Wells
Expansible anchor or casing
Liner hanger
166217, 285145, 285140, 285338, E21B 2300, E21B 3304
Patent
active
049497871
ABSTRACT:
A casing hanger seal member has a locking section that will lock the seal member to the casing hanger, to the wellhead, or to both. A set of serrations are formed on the wellhead and also on the casing hanger, across from each other. The seal member has a seal on its lower end that seals below the serrations. A locking section extends upward from the seal section. A locking section has inner and outer walls which are separated by an annular channel. Serrations are formed on the inner and outer walls for engaging the serrations on the wellhead and the casing hanger. An energizing ring locates within the channel, urging the inner and outer walls radially apart form each other to cause engagement of the serrations. The serrations on the inner and outer members have a pitch that is the same as the pitch on the wellhead and casing hanger, divided by a whole number greater than one.
REFERENCES:
patent: 4521040 (1985-06-01), Slyker et al.
patent: 4641708 (1987-02-01), Wightman
patent: 4665979 (1987-05-01), Boehm, Jr.
patent: 4678209 (1987-07-01), Guice
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patent: 4832125 (1989-05-01), Taylor
Brammer Norman
Nobileau Philippe C.
Bradley James E.
Neuder William P.
Vetco Gray Inc.
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