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Normalised dimensionless difference between the sandface bottomhole pressure (BHP) and sandface reservoir pressure
and a model of a full-entry vertical well with homogeneous reservoir and non-damaged
near-well reservoir zone :
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S = \frac{2 \pi \sigma}{q_t} \cdot \left[ p_{wf}(t) - p({\bf r}, t) |_{{bf r} \nin A_sp^*_{wf}(t)} \right] |
where
By definition the skin-factor is a pressure adjustment at the well-reservoir contact and does not affect pressure distribution in reservoir away from wellbore
.
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