Installation of vertically moored platform

Ships – Building – Canal and ferry boats

Patent

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Details

114 5D, B63B 3544

Patent

active

039760219

ABSTRACT:
This invention relates to the installation of a Vertically Moored Platform and equipment and apparatus used in effecting such installation. The floating structure, anchored only by essentially parallel and vertical elongated members under tension, is positioned with a gravity base over the subsea well site. The gravity base is lowered from engagement with the floating structure with cables to the sea floor while maintaining the floating structure in a positive buoyancy state. A large-diameter drive pipe is inserted through each receiving passage in the gravity base and into the soil or rock beneath the gravity base where it is anchored. A conductor is inserted through the drive pipe and anchored or cemented to the soil or rock beneath the drive pipe. A riser pipe is then inserted into the drive pipe and secured to the conductor. The upper end of the riser pipe is secured to the floating structure. Up to 32 or more such risers are connected between the floating structure and the gravity base. The riser pipes are then placed under tension and the cables used to lower the gravity base are then removed. Drilling operations then proceed through each of the risers. Modification of this installation and equipment necessary therefor are described.

REFERENCES:
patent: 3154039 (1964-10-01), Knapp
patent: 3648638 (1972-03-01), Blenkarn
patent: 3710580 (1973-01-01), Mott
patent: 3780685 (1973-12-01), Horton
patent: 3902843 (1975-09-01), Genini et al.

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