F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
277/66
F16L 35/00 (2006.01) E21B 33/043 (2006.01) F16J 15/12 (2006.01) E21B 33/00 (2006.01)
Patent
CA 1271789
ABSTRACT The subsea wellhead system includes a wellhead, a housing seat disposed and connected to the wellhead, a casing hanger landed and supported by the housing seat; a holddown and sealing assembly disposed in the annulus between the wellhead and casing hanger, a running tool attached to the casing hanger for lowering the casing hanger into the well and for initially actuating the holddown and sealing assembly, and other apparatus for applying hydraulic pressure to further actuate the seal of the holddown and sealing assembly. The housing seat and wellhead are connected by a breech block connection. The housing seat maintains a full 360° circum- ferential bearing surface with the casing hanger. The holddown and seal assembly includes an upper rotating member threadingly engaging the casing hanger and suspending a lower stationary member. The stationary member includes a Z-shaped portion composed of a plurality of frustoconical metal rings connected together by connector links so as to provide a positive connective link throughout the staionary member. The annular links form grooves for housing resilient elastomeric members where, upon the compression of the Z-shaped portion of the stationary member, the elastomeric members initially seal- ingly engage the wellhead and casing hanger and then, upon further compression, the annular links deform into metal-to-metal engage- ment with the wellhead and casing hanger so as to form a metal-to- metal primary seal. The seal is actuated initally by the application of torque through a running tool connected to the casing hanger. The seal is further actuated by the application of hydraulic pressure below the blowout preventer whereby a compression set of the seal is achieved which is greater than the working pressure of the well. The rotating member of the holddown and seal assembly re ?se of the compression get upon the removal of the hydraulic pressure. V1871/C
487752
Cooper Cameron Corporation
Smart & Biggar
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