A property characterising agility of the gas under pressure gradient with account of reservoir permeability and dynamic fluid viscosity:

(1)	$\begin{array}{l}\displaystyle M_g = \frac{k_g}{\mu_g} = k_{air}\cdot M_{rg}\end{array}$

where

$\begin{array}{l}k_g\end{array}$	formation permeability to gas
$\begin{array}{l}\mu_g\end{array}$	dynamic viscosity of gas
$\begin{array}{l}k_{air}\end{array}$	absolute permeability to air
$\begin{array}{l}k_{rg}\end{array}$	relative formation permeability to gas
$\begin{array}{l}\displaystyle M_{rg} = \frac{k_{rg}}{\mu_g}\end{array}$	relative gas mobility

Page tree

See also