D-Exponent

Input(s)

d: Penetration Rate $(\mathrm{ft} / \mathrm{h})$

$\mathrm{N}$: Rotary Speed (rpm)

W: Weight on Bit in 1000lb (lb)

D: Bit Size (in.)

Output(s)

d: D Exponent (dimensionless)

Formula(s)

Reference(s)

Lyons, W. C., Carter, T., and Lapeyrouse, N. J., 2012, Formulas and Calculations for Drilling, Production and Workover Third Edition Gulf Professional Publishing, Page: 214.