E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/12 (2006.01) B63B 21/50 (2006.01) E21B 7/128 (2006.01) E21B 17/01 (2006.01) E21B 19/00 (2006.01) E21B 43/017 (2006.01)
Patent
CA 2316737
A method for exploiting natural resources under the seabed, where a surface vessel (1) is anchored almost geostationarily by means of a turret (3) rotatable relative to the vessel (1) about a vertical axis (4) and having mooring cables (7) extending to the seabed, and where the drilling and/or production of a well (6) in the seabed (2) is carried out from the vessel (1). The drilling of the well (6) is carried out from a drilling section (5, 12) in the vessel (1) at a distance from the axis of rotation (4) of the turret (3). The drilling is carried out using a drill string through a riser (13) extending from the seabed (2) to the drilling section (5, 12), which riser (13) can be broken and shut off (14) between the seabed (2) and the vessel (1). By manipulating (hauling in and slackening) the mooring cables (7), the vessel (1) is held in position so that the derrick (5) is kept almost geostationary relative to the well (6) during drilling operations. A system for drilling a well in the seabed, comprising a surface vessel (1), means for holding the vessel (1) in a desired position above a point on the seabed (2), which means comprise a turret (3) rotatable relative to the vessel (1) about a vertical axis (4) and which can be anchored to the seabed (2) by means of a plurality of mooring cables (7), and a riser (13) extending from the seabed (2) to the vessel (1) through which the well can be drilled with a drill string from a derrick (5) in a drilling section on board the vessel (1). The turret (3) and the drilling section (12) are arranged so as to be spaced apart in the longitudinal direction of the vessel. The riser (13) is arranged in a circular sector around the turret (3) which is free of mooring cables (7) and possible production risers (16). The turret (3) includes means for manipulating (hauling in/slackening) the mooring cables. The riser (13) is capable of breaking and being shut off (14) between the seabed (2) and the vessel (1).
Bye Morten
Karp Terje
Wanvik Leiv
Bereskin & Parr
Kvaerner Oil & Gas A.s.
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