Drilling platform
First Claim
1. A method for using an off-shore drilling platform or the like in ice-filled waters, which platform is supported by support legs standing on the bottom of the sea, said method including the steps of providing those portions of said drilling platform which are to be protected against ice pressure with protective structures below said platform and, when ice conditions occur, lowering said platform and/or said protective structures along said support legs to a level where said protective structures partly extend below the surface of the ambient water and maintaining the protective structures each in a rigid and fixed relationship with respect to the support legs.
2 Assignments
0 Petitions
Accused Products
Abstract
An off-shore drilling platform or the like supported by support legs standing on the bottom of the sea is converted to withstand ice pressure occurring in ice filled waters by providing those portions of said drilling platform, which are to be protected against ice pressure, with protective structures below the platform. The drilling platform and/or the protective structures are then, when ice occurs, lowered along the support legs to a level where the protective structures partly extend below the surface of the ambient water.
-
Citations
14 Claims
- 1. A method for using an off-shore drilling platform or the like in ice-filled waters, which platform is supported by support legs standing on the bottom of the sea, said method including the steps of providing those portions of said drilling platform which are to be protected against ice pressure with protective structures below said platform and, when ice conditions occur, lowering said platform and/or said protective structures along said support legs to a level where said protective structures partly extend below the surface of the ambient water and maintaining the protective structures each in a rigid and fixed relationship with respect to the support legs.
-
13. An off-shore drilling platform or the like having support legs for supporting the platform above the water by standing on the sea bottom, said platform being provided with protective structures for protecting the support legs against the force of moving ice when the structure is situated in ice-filled water, said protective structures being formed to break ice by bending, and said platform being provided with means for keeping the protective structures well above the surface of the water when the platform is situated in open water and for lowering them to the water surface level when ice occurs and maintaining them in a rigid and fixed relationship with respect to the support legs.
-
14. An off-shore drilling platform having a drill shaft for drilling the sea bottom, the platform being provided with a protective structure for protecting the drill shaft against the force of moving ice when the platform is situated in ice-filled water, said protective structure being formed to break ice by bending, and said platform being provided with means for keeping the protective structure well above the surface of the water when the platform is situated in open water and for lowering it to the water surface level when ice occurs and maintaining it in a rigid and fixed relationship with respect to the longitudinal direction of the drill shaft.
Specification