Floating offshore structure containing apertures
First Claim
1. An offshore floating structure comprising:
- an outer wall, said wall defining a centerwell through the longitudinal central portion of said structure;
an operating platform, said platform being attachable to said wall;
buoyancy tanks connected to the inner sides of said structure, said buoyancy tanks being sufficient to maintain the operating platform a predetermined distance above the surface of a body of water after said operating platform has been attached to said wall;
a first portion of said wall having a plurality of apertures, the total surface area of said apertures being less than or equal to the one third of the total surface area of said first portion of said wall, said first portion of said wall further including a coaming surrounding one or more of said apertures, each of said coamings protruding outwardly from said wall;
a second portion of said wall including a fluid retention tank connected to the inner sides of said wall, said tanks being characterized by the ability to retain variable volumes of fluid;
a ballast located beneath said fluid retention tank; and
a means for releasably mooring said structure.
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Accused Products
Abstract
A floating offshore structure for use in oil or gas drilling or production operations, having apertures in its sides in order to reduce the movement of the structure as a result of undersea currents is disclosed herein. The structure contains a production platform extending above the ocean'"'"'s surface, a series of buoyancy tanks providing the structure with the ability to float, apertures, surrounded by coamings, located around the structure such that ocean currents are allowed to flow laterally through the center of the structure and such that oil and gas can dissipate from the center of the structure if a rupture occurs, a fluid retention tank and ballast in order to lower the center of gravity of the structure and make it more stable, and a centerwell running through the longitudinal center of the structure which allows one or more risers to run from the ocean floor to the operating platform. The structure can then be moored to the sea floor through the use of a catenary or other mooring system.
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Citations
13 Claims
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1. An offshore floating structure comprising:
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an outer wall, said wall defining a centerwell through the longitudinal central portion of said structure;
an operating platform, said platform being attachable to said wall;
buoyancy tanks connected to the inner sides of said structure, said buoyancy tanks being sufficient to maintain the operating platform a predetermined distance above the surface of a body of water after said operating platform has been attached to said wall;
a first portion of said wall having a plurality of apertures, the total surface area of said apertures being less than or equal to the one third of the total surface area of said first portion of said wall, said first portion of said wall further including a coaming surrounding one or more of said apertures, each of said coamings protruding outwardly from said wall;
a second portion of said wall including a fluid retention tank connected to the inner sides of said wall, said tanks being characterized by the ability to retain variable volumes of fluid;
a ballast located beneath said fluid retention tank; and
a means for releasably mooring said structure. - View Dependent Claims (6)
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2. An offshore floating structure comprising:
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an outer wall, said wall defining a centerwell through the longitudinal central portion of said structure;
buoyancy tanks connected to said wall, said buoyancy tanks sufficient to maintain the buoyancy of said structure such that a portion of said wall is maintained a predetermined distance above the surface of a body of water;
a plurality of apertures in the sides of a first portion of said wall, the first portion of said wall containing no solid inner wall;
a means for lowering the center of gravity of said structure; and
a means of mooring said structure to the floor of a body of water. - View Dependent Claims (3, 4, 5, 7, 8, 9, 10, 11, 12)
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13. An offshore floating structure comprising:
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an outer wall, said wall defining a centerwell through the longitudinal central portion of said structure;
buoyancy tanks connected to said wall, said buoyancy tanks sufficient to maintain the buoyancy of said structure such that a portion of said wall is maintained a predetermined distance above the surface of a body of water;
a plurality of apertures in the sides of a first portion of said wall, with a coaming completely surrounding one or more of said apertures;
a means for lowering the center of gravity of said structure; and
a means of mooring said structure to the floor of a body of water.
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Specification