Abstract
ABSTRACT The IADC has adopted an improved rock bit dull grading system modeled after the previously used "T,B,G Remarks" approach. This paper discusses the improved system as it applies to roller cone bits (application of the new system for fixed cutter bits is presented in another paper). A complete definition of the system is given. Descriptions and possible causes of many dulling characteristics of roller cone bits are presented and briefly discussed. Some example dull bits are graded using the improved system. An application of the dull grading system as used in well planning is demonstrated.
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