Compliant offshore platform

Hydraulic and earth engineering – Marine structure or fabrication thereof – With anchoring of structure to marine floor

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Details

405195, 405224, E02B 1702

Patent

active

046966030

ABSTRACT:
A complaint offshore platform in which the primary restoring force to lateral displacement is established by flex piles driven into the seafloor and fixedly secured to the platform legs a preselected distance above the seafloor. The platform includes a substantially rigid space-frame structure extending from the ocean bottom to a position above the ocean surface. A drilling and production deck is secured atop the space-frame structure. Shear piles extend through the base of the space-frame structure to prevent lateral displacement of the base while permitting the space-frame structure to pivot about its base. As the platform sways about its base in response to environmental forces, the flex piles establish a vertical couple at the location at which they are attached to the space frame structure. This couple resists movement of the platform away from a vertical orientation. In the preferred embodiment, the flex piles are secured to the platform at or near one-half the total height of the space-frame structure.

REFERENCES:
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"A New Deep-Water Platform--The Guyed Tower"; Journal of Petroleum Technology; Apr. 1978, pp. 537-544.
"Compliant Jacket Challenges Deep Water with New Design"; Oil & Gas Journal; May 6, 1985; pp. 112-115.

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