Composite IPR Productivity Index

J_i=\frac{q}{(P_r-P_b)+\frac{P_b}{1.8}\left[1-0.2\left(\frac{P_{wf}}{P_r}\right)-0.8\left(\frac{P_{wf}}{P_r}\right)^2\right]}

Tabular solver

Run the same equation across multiple cases and compare results in one table.