The productivity index is then calculated from the above Equation. It is important to note that the productivity index is a valid measure of the well productivity potential only if the well is flowing at pseudosteadystate conditions. When considering the performance of oil wells, it is often assumed that a well’s performance can be estimated by the productivity index. However, Evinger and Muskat pointed out that, for multiphase flow, a curved relationship existed between flow rate and pressure and that the straight-line productivity index did not apply to multiphase flow.
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It is important to note that the productivity index is a valid measure of the well productivity potential only if the well is flowing at pseudosteadystate conditions. If you do not directly track Good Count , it also needs to be calculated.
Performance takes into account Performance Loss , which includes all factors that cause the production asset to operate at less than the maximum possible speed when running including Slow Cycles and Small Stops.