AN OFFSHORE DRILLING RIG AND A METHOD OF OPERATING THE SAME

摘要

An offshore drilling rig comprising a drill deck, at least one work center arranged in the drill deck; a diverter system operatively connectable at least to a riser extending towards the seafloor; a hoisting system adapted for raising or lowering tubular equipment through the work center; wherein the offshore drilling rig comprises a first positioning system configured for positioning at least the work center and/or the diverter system and/or a riser tensioning system 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.

主权项

1. An offshore drilling rig comprising:
a drill deck; a first work center arranged in the drill deck; a diverter system operatively connectable to a riser extending towards the seafloor; a first hoisting system adapted for raising or lowering tubular equipment through the first work center; a second work center arranged in the drill deck horizontally spaced apart from the first work center; a second hoisting system adapted for raising or lowering tubular equipment through at least the second work center wherein the offshore drilling rig comprises a first positioning system configured for positioning at least the diverter system selectively at a first horizontal position and a second horizontal position, different from the first horizontal position; and wherein the first hoisting system is operable to raise or lower tubular equipment through the first work center and through said diverter system at least when said diverter system is positioned at said first horizontal position and the drilling rig is operable to raise or lower tubular equipment through the diverter system by means of at least the second hoisting system when the diverter system is positioned at said second horizontal position.