Normalised dimensionless difference between the drawdown survey wellbore pressure sandface bottomhole pressure (BHP)
and a model with non-damaged near-well reservoir zone and sandface reservoir pressure :| \displaystyle p({\bf r}, t) |_{{\bf r} \in \Gamma_s} |
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at the boundary of damaged reservoir zone : | LaTeX Math Block |
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S = \frac{2 \pi \sigma}{q_t} \cdot \left[ p_{wf}(t) - p^*_{wf}(t) \right] |
where
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It quantitatively characterises permeability change in a thin layer around the well or fracture plane caused by stimulation or deterioration during production, injection or well intervention.
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