ANTIWHIRL PDC BIT DESIGNS REDUCE VIBRATIONS

Polycrystalline diamond compact (PDC) bits designed to eliminate whirling can improve penetration rates and create less vibration in downhole assemblies. They also can improve core recovery. The use of antiwhirl bits in directional drilling is promising and has prompted development of a number of field guidelines. These bits control whirl by the cutter locations which generate a resultant imbalance force that is directed toward a low friction gauge pad. The bit is then stabilized against the

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