The most accurate estimation of Productivity Index is based on 3D numerical computation but there are numerous proxy models covering popular categories of reservoir flow regimes, dynamic reservoir properties and well-reservoir contacts.
J = \frac{2 \pi \sigma}{ \ln \frac{r_e}{r_w} + \epsilon+ S} |
where
| for Steady State (SS) well flow regime | |
| for Pseudo Steady State (PSS) well flow regime |
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[ Definition specifics on formation pressure and productivity index ]
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