Installation of vertically moored platforms

Ships – Floating platform – Multiple leg

Patent

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Details

61 94, B63B 3544

Patent

active

040623130

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 well site. The gravity base is then ballasted to effect tilting in a controlled manner. Ballasting is continued to bring the gravity base and platform back to a vertical position. Then 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. In the preferred embodiment 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 then 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: 3366088 (1968-01-01), Gibson
patent: 3648638 (1972-03-01), Blenkarn
patent: 3780685 (1973-12-01), Horton
patent: 3859804 (1975-01-01), Koehler et al.
patent: 3919957 (1975-11-01), Ray et al.
patent: 3934528 (1976-01-01), Horton et al.

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