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Offshore drilling rig and a method of operating the same

  • US 10,202,808 B2
  • Filed: 07/12/2017
  • Issued: 02/12/2019
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. An offshore drilling rig comprising:

  • a drill deck;

    a first work center arranged in the drill deck;

    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;

    a riser tensioning system operable to provide tension to said riser;

    wherein the offshore drilling rig comprises a first positioning system configured for positioning at least the riser tensioning system selectively at a first horizontal position and a second horizontal position, different from the first horizontal position; and

    wherein the first and second work centers are both primary well centers, each comprising a diverter system arranged below the primary well center, each diverter system operatively connectable to a riser extending towards the seafloor, andthe first hoisting system is operable to raise or lower tubular equipment through the said riser at least when said riser tensioning system is positioned at said first horizontal position and the drilling rig is operable to raise or lower tubular equipment through the said riser by means of at least the second hoisting system when the riser tensioning system is positioned at said second horizontal position.

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