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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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f Feeder<br />

792 Drilling and Well Completions<br />

I- Inside Diameter (ID.)<br />

Diamond Set Pad<br />

Junk Slot<br />

Face Discharge<br />

Ports<br />

(Primary)<br />

Collector<br />

(Secondary)<br />

3<br />

FLUID<br />

COURSES<br />

Control Diameters<br />

(TFA & Collector)<br />

Figure 4-145. Diamond core bit nomenclature [50]. (Courtesy Hughes<br />

Christensen.)<br />

Table 4-99<br />

Bottomhole Hydraulic Horsepower Required for Diamond Drilling [49]<br />

Penetration Rate, Whr 1-2 2-4 4-6 6-1 0 over 10<br />

Hydraulic Horsepower<br />

Required, HPJsq. inch 1-1.5 1.5-2 2-2.5 2.5-3 3-3.5<br />

bottom of the hole. This force is large at the higher bit hydraulic horsepower<br />

being utilized today and in some cases may require additional bit weight to<br />

compensate. For example, the pumpoff force on an 8 &-in. diamond bit having<br />

a pressure drop across the bit of 900 psi would be about 6,000 lb.

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