| 摘要 |
PCT No. PCT/DK86/00120 Sec. 371 Date Jul. 7, 1987 Sec. 102(e) Date Jul. 7, 1987 PCT Filed Oct. 29, 1986 PCT Pub. No. WO87/02915 PCT Pub. Date May 21, 1987.Drilling equipment, especially for offshore use, comprises a drill floor or platform (11) with a derrick (10) extending upwards therefrom. A first hoist (12) connected to the upper part of the derrick is used for passing a length of a tubular body (19), such as a drill string or a well casing, through a drilling opening (18) defined in and extending through the drill floor. The tubular length is connected to or disconnected from the drill string or well casing during the drilling operation, and such tubular lengths are strored in a storage area (31, 32) of the drill floor. The tubular lengths may be transported from the storage area to the first hoist (12) and vice versa by means of first transporting means (22). The drill floor or platform (11) also defines a preparation opening (21) extending therethrough at a location spaced from the drilling opening and from the storage area, and a second hoist or a preparation hoist (20) is connected to the upper part of the derrick above the preparation opening. Two or more tubular sections may then be assembled to tubular lengths at the preparation opening by means of the preparation hoist while the drilling operation is going on at the drilling opening, and the prepared lengths may be transported to and stored in the storage area ready for use at the drilling opening. Similarly, tubular lengths may be disassembled into tubular sections at the preparation opening before they are to be transported from the drilling site. The possibility of assembling and disassembling tubular lengths form tubular sections at the preparation opening while the drilling operation is going on at the drilling opening substantially reduces the necessary idle time in drilling operations.
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