Patent ID: 8342249

Claim:
A method for drilling an offshore wellbore at a single wellhead into a seabed from a platform positioned proximate to a water surface and above a water column, comprising: withdrawing, with a first conveyance assembly, a first tubular string from the wellbore into the water column at a location proximate to the seabed; running, with a second conveyance assembly, a second tubular string into the water column and then the wellbore at the location proximate to the seabed after withdrawing the first tubular string from the wellbore with the first conveyance assembly; and wherein each conveyance assembly has a load path and wherein a load path of the first conveyance assembly is laterally offset from a load path of the second conveyance assembly, and wherein the alternating of operations conducted in the wellbore from the first conveyance assembly and the second conveyance assembly can continue through both the top hole drilling phase and the bottom hole drilling phase through a blowout preventer until the well is completed.