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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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778 Drilling and Well Completions<br />

IADC CODE 537<br />

IADC CODE 627<br />

Ik4mL-J<br />

Figure 4-142. Cutting structures of insert bits [44]. (Courtesy SPE.)<br />

Dull Grading for Roller Cone Bits<br />

Grading a dull bit and evaluating the findings can increase drilling efficiency<br />

while lowering drilling cost. Also, the examination of the dull bit can often<br />

furnish information that will assist the selection of bit types and also help<br />

determine the advisability of changing operating practices. The bit life need not<br />

be totally used before it is graded, since the grading is to determine what<br />

happened to the bit during a specific drilling run. The condition of each bit<br />

should be reported in the “Bit Record” section of the IADC Daily Drilling<br />

Report form.

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