Undersaturated oil viscosity	μ_o	cp	p > p_b	$\begin{array}{l}\displaystyle \mu_o(p, T) = \mu_{ob} \cdot \left( \frac{p}{p_b} \right)^m\end{array}$ , $\begin{array}{l}m=c_1 \cdot p^{c_2} \cdot 10^a\end{array}$ , $\begin{array}{l}a = c_3 \cdot p +c_4\end{array}$ $\begin{array}{l}c_1 = 2.6, \ c_2 = 1.187, \ c_3 = -3.9 \cdot 10^{-5}, \ c_4 = -5\end{array}$

where

$\begin{array}{l}\mu_{ob}\end{array}$	cp	oil viscosity at bubble point pressure p_b
$\begin{array}{l}p\end{array}$	psia	Fluid pressure

References

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