A significant research and development effort plus extensive laboratory and field tests have resulted in a new generation of roller cone bits, namely an energy balanced roller cone bit. An energy balanced roller cone bit incorporates three patented features: (1) balanced cutting structure, (2) optimized tooth orientation, and (3) optimized anti-tracking mechanism. This paper details the principles of these three features and their application to rock bit design. Field performance of energy balanced bits is evaluated by rate of penetration, footage drilled, durability of cutting structure, and reliability of bearing/seal system. Significant performance improvement has been observed in the field.

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