Hydraulic and earth engineering – Marine structure or fabrication thereof – With work deck vertically adjustable relative to floor
Patent
1985-12-18
1987-04-14
Husar, Cornelius J.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With work deck vertically adjustable relative to floor
405195, 405171, 166341, 166366, 166350, E21B 1900
Patent
active
046574395
ABSTRACT:
A method and apparatus is set forth in the present invention for supporting the weight of a marine riser by use of a passive tensioning system which utilizes a buoyant member located upon the upper end of the riser. The member has a vertical slot defined through its side such that the riser may access the member from a lateral direction. Such lateral access of the riser to the member allows these buoyant members to be changed from beneath the riser when maintenance and/or inspection is required on a particular member.
Since the riser need only to move laterally to access any member, and the riser may be temporarily supported at the surface by other means, the lower end of the riser does not need to be disconnected from subsea equipment when maintenance and/or inspection operations are required on a buoyant member. Well operations do not need to be interrupted, therefore, during buoyant member maintenance operations.
REFERENCES:
patent: 3729756 (1973-05-01), Cook et al.
patent: 3911688 (1975-10-01), Behar et al.
patent: 4047579 (1977-09-01), Wilckens et al.
patent: 4174011 (1979-11-01), Zaremba
patent: 4422801 (1983-12-01), Hale et al.
patent: 4477207 (1984-10-01), Johnson
Hall Kristina I.
Husar Cornelius J.
Shell Offshore Inc.
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