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titleProductivity Index Analysis


The The instantaneous Total Sandface Productivity Index for single-phase low-compressibility fluid and low-compressibility rocks  does not depend on on formation pressure, bottom-hole pressure and the flow rate and  bottomhole pressure and the flowrate and can be expressed as:

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J(t) = \frac{q_t}{p_i - p_{wf}(t)} =\frac{ 4 \pi \sigma }{ 2S - F \bigg( - \frac{r_w^2}{4 \chi t} \bigg)  }


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