OFFSHORE DRILLING VESSEL

摘要

An offshore drilling vessel includes a main deck, a moonpool a firing line hoist system having a tower, a BOP transport system and a pivotally supported U-shaped working deck. The U-shaped working deck can be pivoted between an active position, in which it extends in a substantially horizontal direction such that it covers a portion of the moonpool, and a non-active position, in which it extends in a substantially vertical direction such that it provides room for a BOP to be moved by the BOP transport system from a storage position adjacent the moonpool into a launch position above the moonpool, in which launch position the BOP is located between the tower and the working deck.

主权项

1. An offshore drilling vessel comprising:
a hull having a moonpool; a main deck, which main deck is supported by the hull; a firing line hoist system, which firing line hoist system is supported by the hull, the firing line hoist system comprising:
a tower, which tower is arranged at said moonpool, and which tower has a top and a base, a first side and a second side, and wherein the base of the tower is connected to the hull of the drilling vessel at the moonpool such that the first side of the tower faces the moonpool; anda hoisting device, which hoisting device comprises a load attachment device displaceable supported by the tower, one or more cables and one or more associated winches to manipulate the position of the load attachment device relative to the tower in a vertical direction along a firing line, which firing line extends on the outside of and adjacent to the first side of the tower and through the moonpool, and the hoisting device is adapted for raising and lowering a BOP to the seabed; a BOP transport system, provided at the first side of the tower and configured for moving a BOP between a storage position adjacent the moonpool and a launch position above the moonpool, in which launch position the BOP is located in the firing line and can be manipulated by the hoisting device, which BOP transport system comprises:
a BOP transport track, which BOP transport track comprises two parallel guide rails that are supported by the hull such that they bridge the moonpool in a lateral direction thereof; anda BOP transport cart, which transport cart is movably supported by the guide rails; and a U-shaped working deck, which U-shaped working deck is provided at the first side of the tower above the parallel guide rails of the BOP transport system, which U-shaped working deck comprises a base part, and two leg parts, which leg parts are with a proximal end connected to said base part at spaced apart locations such that the leg parts between them define an elongate slot for receiving a tubular supported in the firing line, the elongate slot having a closed end, located in a central area of the U-shape working deck between the proximal ends of the legs, and an open end, located at a side of the U-shaped working deck between distal ends of the legs, wherein the U-shaped working deck is pivotally supported such that the U-shaped working deck can be pivoted about a working deck pivot axis, which working deck pivot axis extends parallel to the guide rails of the BOP transport track and is provided at a distance from the tower such that the BOP transport track extends between the pivot axis and the tower, and wherein a working deck pivot drive is provided that can pivot the working deck about said pivot axis between:
an active position, in which the working deck extends in a substantially horizontal direction such that it covers a portion of the moonpool while the firing line extends through the elongate slot at the closed end thereof; anda non-active position, in which the working deck clears the BOP transport track and extends in a substantially vertical direction such that the working deck provides room for a BOP to be moved by the BOP transport system into its launch position above the moonpool between the tower and the working deck, and wherein the working deck is pivotally supported at a base part thereof, such that when the U-shaped working deck is pivoted from the non-active position into the active position while a tubular is supported in the firing line, the tubular is received in the elongate slot between the two leg parts.