Abstract
The selection of a suitable bit appears simple and straightforward if one merely reads bit comparison tables; however, in the field, bit selection is considerably more difficult. Many times bit selection is more of an abstract and intuitional decision based on experience rather than an analytical decision based on facts. The following bit selection procedure has five parts: determine the rock compressive strength; identify the type of bit on the basis of rock compressive strength; accurately grade and analyze the previously run dull bit; clearly identify the causes of bit wear and suggest possible improvements in operating practices and bit type; and determine the features on the next bit based on formation characteristics and wear pattern of previous bit. This diagnostic approach of bit selection imparts the desired weight to each factor: formation strength, formation properties, bit limitations, and operating practices. All the practical limitations of field operations have been kept in mind in designing these procedures. A flexible (large and diverse) inventory of bits near the drill site will facilitate the effective implementation of this bit selection procedure.
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