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J = \frac{q}{p_{\rm frm} - p_{wf}} = \frac{2 \pi \sigma}{ \ln \frac{r_e}{r_w} + \epsilon + S} |
where
| depending on application may mean a total sandface flowrate (
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| depending on application may mean a drain-boundary formation pressure (
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| wellbore radius (by drill bit) | ||||||||||||
| distance to a drainarea boundary | ||||||||||||
| total skin | ||||||||||||
| a model parameter depending on Productivity Index definitions and boundary type (
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Drain-area Productivity Index,
| Drain-boundary Productivity Index
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Steady State flow regime (SS) |
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Pseudo-steady State flow regime (PSS) |
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