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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Drilling Bits and Downhole Tools 797<br />

100<br />

200<br />

300<br />

500<br />

I<br />

CRITICALSPEED<br />

I<br />

I I<br />

L<br />

w<br />

y 1000<br />

I<br />

I-<br />

c3<br />

5<br />

J<br />

L3<br />

g 2000<br />

I-<br />

v)<br />

J<br />

1 3000<br />

CT<br />

n<br />

5000<br />

10,000<br />

15,000<br />

20,000<br />

30,000<br />

20 30 50 100 200 300 400 600 800<br />

ROTARY SPEED-RPM<br />

Figure 4-149. Critical rotary speed for core bits [51]. (Courtesy API.)<br />

Greater bit design freedom is generally available with matrix body bits because<br />

they are “cast” in a moldlike natural diamond bits. Thus, matrix body bits<br />

typically have more complex profiles and incorporate cast nozzles and waterways.<br />

In addition to the advantages of bit face configuration and erosion resistance<br />

with matrix body bits, diamond compact matrix bits often utilize natural

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