Pipe joints or couplings – Pipe to discreet nipple or sleeve to plate – Expandable detent engages plate to hold nipple
Patent
1987-12-28
1988-12-13
Novosad, Stephen J.
Pipe joints or couplings
Pipe to discreet nipple or sleeve to plate
Expandable detent engages plate to hold nipple
166 82, 166208, 166182, 277117, 277190, 277236, 285341, 285348, E21B 3304, E21B 33043
Patent
active
047905727
ABSTRACT:
A packoff assembly for sealing between a casing hanger and a wellhead for a subsea well uses a tapered wedge. The tapered wedge locates between inner and outer seal rings formed of metal. When moved downward, the wedge member pushes the seal rings outward to form a metal seal. The seal rings are formed separate from and carried on a base member. The wedge member extends down into a cavity in the base member. Pins connect the wedge member to the base member to retain the seal ring, but allow longitudinal movement of the wedge movement relative to the base member. An elastomeric seal locates between the upper ends of the seal rings and a drive member which moves the wedge member downward.
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patent: 3489219 (1970-01-01), Regan
patent: 4131287 (1978-12-01), Gunderson et al.
patent: 4469172 (1984-09-01), Clark
patent: 4595053 (1986-06-01), Watkins et al.
patent: 4653589 (1987-03-01), Alandy
patent: 4665979 (1987-05-01), Boehm, Jr.
patent: 4702481 (1987-10-01), Brammer
patent: 4714111 (1987-12-01), Brammer
patent: 4722391 (1988-02-01), Brammer
Bradley James E.
Novosad Stephen J.
Vetco Gray Inc.
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