offshore drilling system, offshore drilling vessel, and method for drilling an underwater wellbore.

摘要

offshore drilling system comprising a drilling tower (10), a tubular column lifting device with a crown block (23) and a displacement block (24) suspended from said crown block in an arrangement multi-drop, a swing compensation system for providing swing compensation of the displacement block (24). the swing compensation system comprises a hydraulic pulley compensator (32, 33). the system further comprises a movable work platform (70) which is movable with respect to the drill turret (10) within a range of motion including a swing compensation range (72). the swing compensation system is further adapted to provide a swing compensation of the mobile work platform (70) by a hydraulic platform compensator (60), which is hydraulically connected via a hydraulic conduit (65, 66) to the hydraulic compensator. pulley (32, 33), so that in operation, the platform compensator (60) moves synchronously with the pulley compensator (32, 33) of the swing compensation system.