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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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898 Drilling and Well Completions<br />

2600<br />

2400<br />

2200<br />

Circulation Rate 348 gpm<br />

130<br />

120<br />

110<br />

100<br />

-500<br />

1800<br />

- 1600<br />

9<br />

& 1400<br />

v<br />

: 1200<br />

Y<br />

I- 1MM<br />

800<br />

90<br />

*_<br />

70 2<br />

0<br />

al<br />

60<br />

I:<br />

50<br />

40<br />

-<br />

-<br />

-<br />

400 -z<br />

P<br />

u<br />

0<br />

0<br />

m<br />

300 g<br />

c<br />

-<br />

m<br />

200<br />

600<br />

400<br />

30<br />

20<br />

-<br />

100<br />

200<br />

10<br />

0 100 200 300 400 500 600<br />

Differential Pressure (psi)<br />

0<br />

- 0<br />

Figure 4-213. Positive displacement motor, 6%-in. outside diameter, 1 :2 lobe<br />

profile, 348 gallmin, differential pressure limit 580 psi, Example 4. (Courtesy<br />

Smith International, Inc.)<br />

(lest continued from page 895)<br />

q2Tm<br />

= 7430C2d4<br />

(4-171)<br />

where C = nozzle coefficient (usually taken to be 0.95)<br />

de = hydraulic equivalent diameter in in.<br />

Therefore, Equation 4-171 is<br />

(348)'(11.6)<br />

500 =<br />

7,430( 0.98)' de4<br />

which yields<br />

de = 0.8045 in.

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