A property characterising agility of the fluid \alpha-phase under pressure gradient with account of reservoir permeability and dynamic fluid viscosity:
| (1) | \left<\frac{k_\alpha}{\mu_\alpha} \right> = k_{air} \left<\frac{k_{r \alpha}}{\mu_\alpha} \right> |
where
\displaystyle k_\alpha | formation permeability to fluid \alpha-phase |
|---|---|
\displaystyle \mu_\alpha | dynamic viscosity of fluid \alpha-phase |
\displaystyle k_{air} | absolute permeability to air |
\displaystyle k_{r\alpha} | relative formation permeability to fluid \alpha-phase |
\displaystyle \left<\frac{k_{r \alpha}}{\mu_\alpha} \right> | relative phase mobility |
In most practical case of a 3-phase fluid model this will be:
\displaystyle \left<\frac{k_o}{\mu_o} \right> | oil mobility |
\displaystyle \left<\frac{k_g}{\mu_g} \right> | gas mobility |
\displaystyle \left<\frac{k_w}{\mu_w} \right> | water mobility |