Ships – Warships – Turret
Patent
1976-01-05
1976-10-05
Blix, Trygve M.
Ships
Warships
Turret
61 89, 175 7, B63B 3544
Patent
active
039838285
ABSTRACT:
This invention relates to the installation of a vertically moored platform over a selected well site. The platform or structure is supported on a buoyant gravity base and floated to a position over the subsea wall site. The gravity base is attached or held to the platform by a plurality of short sections of riser pipes. The gravity base is then ballasted to give it a negative buoyancy. A joint of riser pipe is then added to each of the short riser pipe sections. The gravity base is then lowered by lowering all the riser pipes simultaneously until the top of the newly added joints is reached. Then a second group of riser joints is added and the process repeated until the gravity base has been lowered to the ocean floor. When the gravity base has reached bottom, heavy ballasting material, such as cement slurry, can be added if needed. The riser pipes which were used to lower the gravity base are the riser pipes which anchor the floating platform to the gravity base which serves as an anchor. It is also through these riser pipes that drilling operations are conducted.
REFERENCES:
patent: 3209544 (1965-10-01), Borrmann
patent: 3457728 (1969-07-01), Pogonowski
patent: 3839873 (1974-10-01), Loire
patent: 3896628 (1975-07-01), Hansen
Blix Trygve M.
Gassett John D.
Goldstein Stuart M.
Standard Oil Company (Indiana)
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