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LaTeX Math Inline
body\epsilon = 0.5
 for steady-state SS flow and 
LaTeX Math Inline
body\epsilon = 0.75
 for pseudo-steady state PSS flow.


Anchor
AOF
AOF

The alternative form of the constant Productivity Index  WFP – Well Flow Performance is given by:

LaTeX Math Block
anchor1
alignmentleft
\frac{q}{q_{max}} = 1 -\frac{p_{wf}}{p_R}

where 

LaTeX Math Inline
bodyq_{max} = J \, p_R
 – is the maximum flow rate which si also called AOF – Absolute Open Flow.


Dry Gas IPR

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For gas producers, the fluid compressibility is high and formation flow is essentially non-linear, inflicting the downward trend on the whole WFP – Well Flow Performance plot (Fig. 2).

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Fig. 2. WFP – Well Flow Performance for dry gas producer or gas injector into a gas formation



The popular dry gas IPR correlation WFP – Well Flow Performance correlation is Rawlins and Shellhardt:

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