New mud supply process saves time and expense in riserless deepwater drilling ///

Drilling riserless with a mud system that mixes correct-density drill fluids on demand allows surface casing to be set deeper and through shallow hazard zones. Case histories illustrate mud system that mixes correct-density drill fluids on the rig floor from pre-formulated fluids and seawater to run 20-in. casing riserless.

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