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Keywords: grading system
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Proceedings Papers

Paper presented at the IADC/SPE International Drilling Conference and Exhibition, March 8–10, 2022
Paper Number: SPE-208740-MS
... that needed to grade dulls. Eight types of information about a worm bit can be recorded similar to the existing IADC grading system. The first four spaces explain the cutting structure. Unlike the first two spaces for "Inner" and "Outer" rows of the cutters of the existing IADC grading system, a single space...

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