The most accurate estimation of Productivity Index is based on 3D numerical computation but there are numerous proxy models covering popular categories of 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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