(14.80)

The friction pressure drop is given by:

$\mathrm{\Delta}{p}_{f}=0.0052\frac{{f}_{f}\rho L{V}^{2}}{D},$ (14.81)

(14.81)

where *L* is the pipe length in ft.

Eqs. (14.77)–(14.81) generally over estimate actual friction values as polymers added in fracturing fluids can dramatically reduce fluid friction. Eqs. (14.77)– (14.81) should also apply to Newtonian fluids, in which *n* becomes 1 and *K* becomes the fluid viscosity. The friction for proppant laden fluids, especially at higher proppant concentrations, is even more difficult to estimate. Various correlations for estimating the friction ...

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