SEMI-SUBMERSIBLE MOBILE DRILLING VESSEL WITH STORAGE SHAFT FOR TUBULAR DRILLING EQUIPMENT

摘要

The semi-submergible movable drill rig of the present invention comprises at least one body 1 and at least one column 2 and 4 supported on said at least one body 1 and having a drilling facility 7 11 are provided. In addition, the drill rig is provided with storage means 13, 15 for a tubular drilling rig 18, such as a riser, drill pipe, casing or liner. Storage means 13,15 comprise one or more shafts 15 disposed within said one or more columns 2, 4 and extending downwardly from said platform 11. [ In the shaft 15, the drilling rig 18 comprising the plurality of elements can be arranged vertically. A guide system such as a rack 13 may be provided on the shaft 15 to ensure fixed positioning of the tubular drilling rig 18. In addition, the shaft 15 may be open or partially open from above. Further, the shaft is preferably watertight from the floor to the freeboard deck 16.