Floating offshore structure

摘要

A floating offshore structure is disclosed. The floating offshore structure, which is for drilling or production, includes a semi-submerged platform body in the shape of a cylinder that is extended vertically above and below the sea level. The platform body is formed with a concave part that reduces its cross-sectional area. The concave part is discontinuously formed along an external circumferential surface of the platform body. The depth of submergence of the platform body is adjusted so that the water line is located at the concave part in an extreme marine condition.

主权项

1. A floating offshore structure used for drilling or production, the floating offshore structure comprising a semi-submerged platform body in a cylindrical shape that is extended vertically above and below a sea level, comprising:
an upper cylindrical portion; a lower cylindrical portion; and a middle portion disposed between the upper and lower cylindrical portions and extending from the upper cylindrical portion to the lower cylindrical portion, the middle portion comprising a plurality of receded parts and a plurality of protruding parts alternately arranged around a central axis of the middle portion such that each receded part is disposed between two of the protruding parts, wherein the receded parts each include an outer end surface, and the protruding parts each include an outer end surface and two side surfaces, the side surfaces extending from the outer end surface of the protruding part toward the central axis of the middle portion and being connected to the outer end surface of the receded part, the outer end surfaces and the side surfaces of the protruding parts and the outer end surfaces of the receded parts jointly define an outer circumferential surface of the middle portion, the outer end surfaces of the receded parts are closer to the central axis than the outer end surfaces of the protruding parts, a distance of the outer end surfaces of the protruding parts from the central axis is equal to a radius of the upper and lower cylindrical portions.