Because of the presence of both compressible and incompressible fluids, accurate multiphase flow modeling is necessary for the planning and implementation of most UBD projects.In underbalanced drilling (UBD), the pressure throughout the well bore is intentionally kept lower than the formation pressure, allowing the well to produce during the drilling operation. This is done for a variety of reasons including reducing formation damage, increasing rates of penetration, eliminating drilling problems such as lost circulation, all with the added benefit of characterizing the reservoir while drilling. To control the bottomhole pressure...

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