| 摘要 |
The present invention also relates to a drilling vessel and a method for operating a drilling vessel adapted to run large diameters surface casing joints and build a surface casing string. The drilling vessel comprises a surface casing storage adapted to store therein multiple surface casing joints having a diameter of over 20 inch (51 cm) and a length of 30-50 feet (9-15 meters), a casing pre-assembly installation, adapted to interconnect three or more surface casing joints into surface casing stands having a length of over 100 feet (30 meters), and a surface casing stand storage on the main deck for storing multiple surface casing stands in a substantially horizontal position. Furthermore, a casing string handling capacity hoisting device is provided to lower relative to said tower the surface casing string. |
