(1) | J = \frac{q}{|p_{wf} - p_e|} |
where
q | flowrate (the specification of which may differ, see below) |
p_e | formation pressure |
p_{wf} | bottom hole pressure at sandface |
The definition of flowrate q and formation pressure p_e may vary depending on application of productivity index.
See Also
Petroleum Industry / Upstream / Production / Subsurface Production / Well & Reservoir Management