Removable bottom founded structure

Details Removable bottom founded structure Removable bottom founded structure

E - Fixed Constructions

02

B

61/12.1

E02B 17/02 (2006.01)

Patent

CA 1298712

ABSTRACT OF THE DISCLOSURE The Removable Bottom Founded Structure (RBFS) is an offshore platform for petroleum drilling and producing operations intended for deployment in waters with severe weather and iceberg conditions. It is a two-part struc- ture comprising (1) a platform which is made up of a deck structure, multiple columns and braces; and (2) a rein- forced concrete subbase that rests on the sea floor and upon which the platform is founded. The structure is normally held down by gravity for standard ? platform oper- ations, but during the deballasting procedure due to an iceberg emergency a hold-down system is employed to keep the platform on the subbase until full deballasting is achieved. The system that is used to hold the platform down onto the subbase is located where the platform meets the subbase. It operates on the principle of hydro- statics. On the underside of the columns there are mul- tiple chambers which may be evacuated by pumping and which are vented to the outside atmosphere. Flexible seals that define these chambers are positively inflated by water to create a fluid-tight seal so that no seawater will enter the evacuated chambers. The reduction of the buoyancy forces will hold the platform onto the subbase until such time as the platform is totally deballasted. Once that has occurred, the hydrostatic hold-down system is disen- gaged and the platform will quickly rise to the surface to assume its floating draft and avoid the iceberg danger. An effective load transfer system between the platform and the subbase is also disclosed.

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