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Pressure log-log plot of unit-rate drawdown survey pressure variationdrop 

LaTeX Math Inline
body\Delta delta p(t) = p_{wf}(0) - p_{wf}(t)
 and pressure log-derivative 
LaTeX Math Inline
body\Delta p'(t) = \frac{d \Delta delta p}{d \, \ln t}
 (see examples at Fig. 1 – Fig. 3).

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The pressure log-derivative 

LaTeX Math Inline
body\Delta delta p'(t)
 provides a zoomed insight into the pressure diffusion dynamics at different times which helps identifying the pressure diffusion model behind the pressure variation.

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