Offshore drilling vessel
First Claim
1. An offshore drilling vessel comprising:
- a hull with a bow and a stern and a main deck therebetween;
a moonpool extending through the hull;
a drilling mast having a top side and a base with a transverse girder connected to the hull and extending over the moonpool between sections of the hull on port and starboard side of the moonpool, the base being spaced from a bow side of the moonpool and from a stern side of the moonpool, thereby forming a first and second moonpool area, wherein the mast has an associated first side and an opposed second side;
a first hoisting device supported by the mast and having a load attachment device displaceable along a first firing line which extends on the outside of and adjacent to the first side of the mast and through the first moonpool area;
the first hoisting device being adapted to build and lower a riser string at the first side of the mast;
a second hoisting device supported by the mast and having a load attachment device displaceable along a second firing line, which extends on the outside of and adjacent to the second side of the mast and through the second moonpool area, the second hoisting device being provided with a rotary drilling drive and being adapted to assemble and disassemble a drill string at the second side of the mast and to effect drilling in the associated second firing line;
a riser tensioner system arranged at the second moonpool area, adapted to suspend the riser string from;
a suspended riser transfer device, which includes a support frame and a pair of associated rails which extend in longitudinal direction along the moonpool, being adapted to displace the support frame while the support frame supports the riser string, built by the first hoisting device, from the first moonpool area underneath the base of the mast to the riser tensioner system arranged at the second moonpool area, where the riser string is attachable to the riser tensioner system.
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Accused Products
Abstract
A monohull offshore drilling vessel includes a hull having a moonpool; a multiple firing line hoist system mounted on the hull at the moonpool and including a mast having a top side and a base connected to the hull, wherein the mast has a hollow construction with a first side and an opposed second side; a first hoisting device having load attachment means displaceable along a first firing line extending on the outside of and adjacent to the first side of the mast; a second hoisting device having load attachment means displaceable along a second firing line, which on the outside of and adjacent to the second side of the mast; wherein the first and second hoisting devices each include cable(s) and associated winch(es), the winches disposed in the hollow construction of the mast, to manipulate the position of each of the load attachment devices relative to the mast.
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Citations
14 Claims
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1. An offshore drilling vessel comprising:
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a hull with a bow and a stern and a main deck therebetween; a moonpool extending through the hull; a drilling mast having a top side and a base with a transverse girder connected to the hull and extending over the moonpool between sections of the hull on port and starboard side of the moonpool, the base being spaced from a bow side of the moonpool and from a stern side of the moonpool, thereby forming a first and second moonpool area, wherein the mast has an associated first side and an opposed second side; a first hoisting device supported by the mast and having a load attachment device displaceable along a first firing line which extends on the outside of and adjacent to the first side of the mast and through the first moonpool area;
the first hoisting device being adapted to build and lower a riser string at the first side of the mast;a second hoisting device supported by the mast and having a load attachment device displaceable along a second firing line, which extends on the outside of and adjacent to the second side of the mast and through the second moonpool area, the second hoisting device being provided with a rotary drilling drive and being adapted to assemble and disassemble a drill string at the second side of the mast and to effect drilling in the associated second firing line; a riser tensioner system arranged at the second moonpool area, adapted to suspend the riser string from; a suspended riser transfer device, which includes a support frame and a pair of associated rails which extend in longitudinal direction along the moonpool, being adapted to displace the support frame while the support frame supports the riser string, built by the first hoisting device, from the first moonpool area underneath the base of the mast to the riser tensioner system arranged at the second moonpool area, where the riser string is attachable to the riser tensioner system. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An offshore drilling vessel comprising:
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a hull with a bow and a stern and a main deck therebetween, the main deck including a rear main deck portion and a front main deck portion; a moonpool extending through the hull; a firing line hoisting system mounted on the hull, comprising; a drilling mast having a top side and a base mounted on the hull and extending over the moonpool; a hoisting device supported by the mast at a front side thereof and having a load attachment device with a rotary drilling device which is displaceable along a firing line extending through a bow side of the moonpool to perform drilling activities; a drill pipe cassette storage provided on or below the rear main deck portion; a rail transportation system provided on the main deck, having one or more trolleys and one or more associated rails forming a longitudinal track extending in longitudinal direction of the main deck between the rear main deck portion and the front main deck portion and passing along a side of the moonpool and a lateral side of the hull of the vessel, the rail transportation system being configured to transport drill pipe cassettes from the drill pipe cassette storage provided on or below the rear main deck portion to the front main deck portion to be used for drilling activities at a front of the mast, and vice versa, as well as to and from an area near the moonpool and the mast; and a crane provided at the front main deck portion near an end of the one or more associated rails, the crane being configured to lift a drill pipe cassette from a trolley of the rail transportation system and place the trolley in a storage position near the bow side of the mast, wherein the drill pipe cassette is stored in a horizontal orientation. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification