Subsea wellhead seal assembly

Details Subsea wellhead seal assembly Subsea wellhead seal assembly

1987-04-30

1988-05-10

Leppink, James A.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166115, 166182, 166208, 166217, 166368, 277118, 277236, 285141, 285315, 285351, 2853825, E21B 33035

Patent

active

047428740

ABSTRACT:
An improved annular seal between tubular members in a subsea wellhead having an annular seal member with a U shape in section with the opening facing upwardly and two interengaged annular wedges for energizing the sealing surfaces of the inner and outer portions of the seal member at different levels. The interengagement of the wedges includes sufficient play to provide proper energizing of both inner and outer sealing surfaces at the same time. Further, the inner sealing surface is positioned at a much higher level than the outer sealing surface and close to the upper end of the inner member in which it is to seal to minimize the setting force for the inner sleeve and to minimize the amount of drag the seal will incur when retrieved. Also, the location of the outer sealing surface close to the inner member shoulder minimizes the reaction path of the lockdown sleeve. A ring engages with the upper interior of the outer leg of the seal and has a lower surface which is tapered downwardly and inwardly and is engaged by a mating taper on the upper surface of the outer wedge member to ensure release of the seal from set position.

REFERENCES:
patent: 3282346 (1966-11-01), Claycomb
patent: 4131287 (1978-12-01), Gunderson et al.
patent: 4595053 (1986-06-01), Watkins et al.
patent: 4600055 (1986-07-01), Durst et al.
patent: 4641708 (1987-02-01), Wightman
patent: 4646845 (1987-03-01), Boeker
patent: 4650225 (1987-03-01), Lee et al.

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