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titleProductivity Index Analysis


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

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J_t = \frac{q_t}{p_i - p_{wf}(t)} =\frac{2 \pi \sigma}{\ln \frac{r_e}{r_w} + S} = {\rm const}


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