Abstract
An understanding of fluid flow through positive displacement motors, turbines, bits, and bit nozzles is of great importance in determining the performance and efficiency of the drilling assembly. It must be made clear at the outset that there is a vast difference in operating characteristics between a positive displacement motor, also known as a Moineau motor, and a turbine or turbodrill. Well-known examples of Moineau motors are the Christensen Navi-Drill, the Smith Dyna-Drill, and the Eastman Whipstock PDM motor. The Neyrfor turbodrills and the Eastman Whipstock turbine are examples of turbines.
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