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Normalised dimensionless difference between the actual drawdown survey wellbore pressure 

LaTeX Math Inline
bodyp_{wf}(t)
and a model of a full-entry vertical well with homogeneous reservoir and non-damaged near-reservoir zone
LaTeX Math Inline
bodyp^*_{wf}(t)
:

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alignmentleft
S = \frac{2 \pi \sigma}{q_t} ( \cdot \left[ p_{wf}(t) - p^*_{wf}(t)) \right]

where

LaTeX Math Inline
bodyq_t
 – total sandface rate

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