Aker Solutions Limited

Yijian Zeng

Tao Wang

Leiv Gunnar Wanvik

Renjian Roger Lu

Stein Rasmussen

An offshore floating structure () for the drilling and production of oil and gas includes a generally circular toroidal, hollow pontoon () of substantially the same radial width throughout a perimeter of the pontoon. The offshore floating structure includes a plurality of columns () of substantially a same cross-sectional area, each coupled at a coupling point, on a bottom end thereof to the pontoon at an equidistant point along the perimeter of the pontoon, and adapted to be coupled on a top end to a deck structure. The diameter () from a center of the radial width of the pontoon is greater than a distance () from a center of one column to a center of an adjacent column.

C-semi with minimum hydrodynamic forces

A deep draft semi-submersible production and drilling platform unit with dry trees is described. The platform unit preferably comprises four columns, a ring pontoon, a two-axis symmetrical hull with draft in the range of 100 to 155 feet, top-tensioned risers with push or pull tensioners of preferred combined vertical stiffness of 10% to 30% of the platform water plane stiffness, a wellbay with a well spacing in the range of 12 to 18 feet, a riser guiding system supported by the pontoons or at an elevated level, topside facilities supported by a box type of deck structure, mooring lines, and catenary risers.

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Katy, TX, United States of America

Yijian Zeng