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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Drilling Bits and Downhole Tools 773<br />

STEEL TOOTH BITS<br />

BIT TYPE DESIGNATION S<strong>OF</strong>T MEDIUM HARD 1<br />

METALLURQY<br />

DESi6N<br />

FEATURES<br />

GEOMETRY<br />

TUNGSTEN CARBIDE BITS<br />

TYPE DESIQNATION S<strong>OF</strong>T MEDIUM HARD<br />

<strong>OF</strong>FItT<br />

Figure 4-138. Roller cone bit design trends [44]. (Courtesy SPE.)<br />

I

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