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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Drill String: Composition and Design 725<br />

N.C. 70<br />

7% REG.'<br />

6% F.H.<br />

5% 1.F.<br />

7 H-90*<br />

N.C. 61<br />

6% H-90<br />

6% REG.<br />

5% F.H.<br />

N.C. 56<br />

REG.<br />

I N.C.50<br />

Reference Line<br />

Figure 4-130a. Practical chart for drill collar selection-2 +-in. ID. (From<br />

Drilco, Division of Smith International, Inc.)

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