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Normalised dimensionless difference between the sandface bottomhole pressure (BHP)
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S = \frac{p_{wf}(t) - p_{ref}(t, r_w)}{ \left[ r \cdot \frac{\partial p}{\partial r} \right]_{r=r_w} } |
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p_{wf}(t) = \frac{q_t}{2 \pi \sigma} \, S + p_{ref}(t,r_w) |
where
| total sandface rate | ||||||||
| formation transmissibility outside the damaged reservoir zone
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| a model of a full-entry vertical well with homogeneous reservoir and non-damaged near-reservoir zone |
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