AN OFFSHORE DRILLING RIG AND A METHOD OF OPERATING THE SAME

摘要

An offshore drilling rig comprising a drill deck (2), at least one work center (3a) arranged in the drill deck; a diverter system (13) operatively connectable at least to a riser (15) extending towards the seafloor; a hoisting system (5a,5b) adapted for raising or lowering tubular equipment (35) through the work center; wherein the offshore drilling rig comprises a first positioning system configured for positioning at least the work center (3a) and/or the diverter system (13) and/or a riser tensioning system (23) selectively at a first horizontal position and a second horizontal position, different from the first horizontal position; and wherein the hoisting system is operable to raise or lower tubular equipment through the work center when said work center is positioned at said first horizontal position.