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Normalised dimensionless difference between the actual drawdown wellbore pressure  p_{wf}(t) and a model of a full-entry vertical well with homogeneous reservoir and non-damaged near-reservoir zone  p^*_{wf}(t):

(1) S_G = \frac{2 \pi \sigma}{q_t} (p_{wf}(t) - p*_{wf}(t))
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