mechanisms and a lack of bearings. The PDC bit cutting mechanism is rock shearing, whereas the diamond matrix is rock grinding. PDC bits are used in all nonabrasive rocks regardless of strength, whereas the diamond matrix bits are generally used in extremely hard abrasive formations. Drill bit selection is based mainly on past bit performance records. Past experience and learning are key factors in selecting the right bit for the right hole interval to be drilled.
Choosing and Using the Right R