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Battered column semi-submersible offshore platform

a technology of semi-submersible platforms and battered columns, which is applied in the direction of special-purpose vessels, vessel construction, transportation and packaging, etc., can solve the problems of fatigue damage, achieve the effect of facilitating the installation of scr, improving platform stability, and restoring larger and more easily

Inactive Publication Date: 2009-09-17
SEAHORSE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]In accordance with a preferred embodiment of the present invention, a semisubmersible platform includes a deck supported on the upper ends of support columns interconnected at the lower ends thereof by a horizontally disposed pontoon-ring. The columns are battered inwardly from the pontoon-ring to the deck. The outer perimeter dimension of the deck is smaller than the outer perimeter dimension of the pontoon-ring which also facilitates installation of SCR on the inside or outside faces of the pontoon-ring. The battered columns improve platform stability during free floating transportation and installation operations by providing a larger restoring moment at shallower drafts.

Problems solved by technology

SCR are stressed by platform motion caused by wave action and suffer fatigue damage during each stress cycle.

Method used

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  • Battered column semi-submersible offshore platform
  • Battered column semi-submersible offshore platform
  • Battered column semi-submersible offshore platform

Examples

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Embodiment Construction

[0011]Referring first to FIG. 1, a preferred embodiment of a battered column semisubmersible platform in accordance with the present invention is generally identified by the reference numeral 10. The platform 10 includes four columns 12 having upper ends projecting above the water surface 14 for engaging and supporting a platform deck 16 thereon. Horizontally disposed pontoons 18 interconnected by base nodes 30 enclose a central opening 20.

[0012]The columns 12 and pontoons 18 form an open structure hull 19 for supporting the deck 16 and the equipment mounted thereon above the water surface 14. The open structure of the hull 19 provides improved wave transparency and access to the seabed from the deck 16 through the hull 19. The columns 12 and base nodes 30 form the corners of the hull 19. The four support columns 12 extend upwardly from the base nodes 30 to the deck 16. The columns 12 are battered or inclined inwardly toward the central vertical axis of the hull 19. Preferably, the ...

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PUM

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Abstract

A semisubmersible platform includes a deck supported on the upper ends of support columns extending upwardly from a horizontally disposed pontoon-ring. The columns are battered inwardly and upwardly from the pontoon-ring to the deck. Mooring lines passing through fair leads on the outer faces of the base nodes anchor the platform to the seabed. The footprint of the battered columns is greater than the footprint of the deck supported on the upper ends of the columns.

Description

BACKGROUND OF THE DISCLOSURE[0001]The present invention relates to offshore floating platforms, more particularly to a semi-submersible offshore platform for installation and use in deep water offshore operations.[0002]Semi-submersible offshore platforms are connected to sub-sea wellheads and other installations via Steel Catenary Risers (SCR), also commonly referred to as risers or riser pipes. In deep water installations, the SCR are thousands of feet in length. SCR are stressed by platform motion caused by wave action and suffer fatigue damage during each stress cycle.[0003]An improvement in the motion performance of a semisubmersible platform may be obtained by battering the deck support columns, thereby reducing SCR stresses. Furthermore, battering the deck support columns increases the free floating stability of the semisubmersible platform, and reduces the overall system costs.SUMMARY OF THE INVENTION[0004]In accordance with a preferred embodiment of the present invention, a ...

Claims

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Application Information

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IPC IPC(8): B63B35/44
CPCB63B35/44B63B1/107B63B39/005B63B2001/128B63B2039/067
Inventor WILLIAMS, ANTHONY NEILHEIDARI, AMIR HOMAYOUNLARGE, SEAN
Owner SEAHORSE EQUIP
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