Wells – Packers or plugs – With detachable setting means
Patent
1987-04-30
1988-06-21
Novosad, Stephen J.
Wells
Packers or plugs
With detachable setting means
166196, 166208, 166348, 277117, 277125, 277236, 285139, 285352, 2853825, E21B 33043
Patent
active
047519657
ABSTRACT:
The improved wellhead seal assembly includes an annular metal seal ring having upper spaced apart inner and outer rims with an upper energizing ring positioned between such rims and movable axially between them, a resilient seal embedded in and extending through ports in the central portion of the seal ring, lower inner and outer seal rings connected to said central portion of said seal ring by inner and outer bellows and a wedging ring depending from the central portion of the seal ring between such bellows and adapted to move downward between the inner and outer seal rings to wedge them apart into sealing engagement with the inner and outer sealing surfaces, such movement being responsive to downward movement of the upper energizing ring and the flexing of the lower bellows legs and continued movement of said upper energizing ring wedging said upper rims apart into sealing engagement with the inner and outer sealing surfaces, the upper energizing ring being releasably connected to the upper seal rims so that said upper seal is not set until the lower seal is completely energized and set.
REFERENCES:
patent: 3282346 (1966-11-01), Claycomb
patent: 4131287 (1978-12-01), Gunderson et al.
patent: 4353560 (1982-10-01), Tohill
patent: 4384726 (1983-05-01), Meyer
patent: 4411435 (1983-10-01), McStravick
patent: 4561499 (1985-12-01), Berner, Jr. et al.
patent: 4646845 (1987-03-01), Boeker
patent: 4665979 (1987-05-01), Boehm, Jr.
Cameron Iron Works USA Inc.
Dang Hoang C.
Novosad Stephen J.
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