Ability of reservoir fluid to translate fluid volumes throughout the pore volume:
(1) | \sigma = \bigg< \frac{k}{\mu} \bigg> \ h |
where
\bigg<\frac{k}{\mu} \bigg> | multiphase fluid mobility |
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h | effective formation thickness |
For a single-phase fluid it simplifies to:
(2) | \sigma = \frac{kh}{\mu} |
where
k | phase permeability |
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\mu | fluid viscosity |
h | effective formation thickness |