A study of the effect of rock bit cutting structure on rock breaking efficiency was made with full scale bits for soft to medium formations on a laboratory testing rig. An analysis of the relationship between rock breakage and cutting structure based on the drilling rate, bottom hole pattern and operating parameters revealed the advantages and weak points of the cutting structures. Improvement of cutting structure for some of the tested bits will be adopted in new designs. This approach is also suitable for studying bits for medium to very hard formations.

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