PDM performance depends on internal geometries

PD MOTORS—1PDM performance can be predicted with analyses based on fluid mechanics and kinematic relationships.Downhole positive displacement motors (PDMs) are commonly used in directional drilling of oil and gas wells to navigate drill bits toward a lateral target.1 Many PDMs are available for use in bottomhole assemblies (BHA); each generally described by the lobe configuration. Each PDM has its own performance characteristics, which depend on internal geometry.This first of two articles explains the governing equations relating internal geometry and performance. The concluding article will give the rationale for selecting a particular PDM for a given drilling situation.Technical...

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