Schlumberger engineers design custom deepwater drilling systems to ensure superior performance to TD. The design process is incorporated into the planning phase of the well, using models from the Petrel E&P software platform and information in the DrillMAP drilling engineering and operations plan. Our team uses predictions for drilling parameters, fluid system needs, and downhole environment to test numerous possible outcomes of a comprehensive BHA in i-DRILL engineered drilling system design. These tools and expert analyses of performance have resulted proven successes, especially in the North Sea.