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