Method for improving the feasibility of a drilling rig of ja ck-up type and a drilling rig of jack-up type

摘要

PCT No. PCT/FI96/00307 Sec. 371 Date Dec. 1, 1997 Sec. 102(e) Date Dec. 1, 1997 PCT Filed Jun. 5, 1996 PCT Pub. No. WO96/41922 PCT Pub. Date Dec. 27, 1996A method and apparatus for an improved drilling rig of jack-up type is provided. The drilling rig has a frame part comprising a working deck and an essentially plane-shaped bottom. Three feet are provided in the frame and are operated by lifting devices. The feet support the frame on the sea bottom during a drilling operation and are lifted off the sea bottom when the drilling rig is transported. A drilling unit is movably arranged on the frame part and can be moved substantially outside the frame during a drilling operation. A residence unit is also provided on the frame and is movable in a direction opposite that of the drilling unit at least during the drilling operation. An air bed is blown into an airspace which is arranged below the frame part of the drilling rig. The air bed is dischargeable for transportation of the drilling rig.