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One of the  Productivity Index diagnostics methods based on plotting pressure integral 

LaTeX Math Inline
bodyPPt(t) = \int_0^t \left( p_{wf}(\tau) - p_e(\tau) \right) d\tau
 vs cumulatives 
LaTeX Math Inline
bodyQ(t) = \int_0^t q_t(\tau) d\tau

...

LaTeX Math Block
anchorpwf
alignmentleft
PPt(t) = J^{-1} Q(t)

where

LaTeX Math Inline
bodyJ

constant productivity index

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