Pipe joints or couplings – With assembly means or feature
Patent
1982-02-16
1986-10-07
Arola, Dave W.
Pipe joints or couplings
With assembly means or feature
285 39, 285 96, 285108, 285140, 285315, 285321, 285348, 285917, 166348, 166380, F16L 3500
Patent
active
046155449
ABSTRACT:
The subsea wellhead system includes a wellhead, a housing seat disposed in and connected to the wellhead, a casing hanger supported by the seat, a holddown and sealing assembly in the annulus between wellhead and hanger, a running tool attached to the hanger for lowering it into the well and initially actuating the holddown and sealing assembly, and apparatus for applying hydraulic pressure to further actuate the seal. The housing seat and wellhead are connected by breech block teeth. The seat maintains 360.degree. bearing surface with the hanger. The holddown and seal assembly includes an upper rotating member threadingly engaging the hanger and suspending a lower stationary member. The latter includes a Z-shaped portion having a plurality of frustoconical metal rings positively connected by links. The rings form grooves housing resilient elasotmeric members. Upon compression of the Z-shaped portion, the elastomeric members initially sealingly engage the wellhead and hanger and then, upon further compression, the rings deform into metal-to-metal engagement with the wellhead and hanger forming a primary seal. The seal is actuated initially by torque applied through a running tool connected to the hanger. It is further actuated by hydraulic pressure whereby a compression set of the seal is achieved. The rotating member follows further compression of the seal to prevent release of the compression set upon removal of hydraulic pressure.
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Arola Dave W.
Conley Ned L.
Rose David A.
Shull William E.
Smith International Inc.
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