Ships – Floating platform – Multiple leg
Patent
1977-02-10
1977-12-13
Halvosa, George E. A.
Ships
Floating platform
Multiple leg
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.
Gassett John D.
Halvosa George E. A.
Sotelo Jesus D.
Standard Oil Company (Indiana)
LandOfFree
Installation of vertically moored platforms does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Installation of vertically moored platforms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Installation of vertically moored platforms will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-484178