GLOSSARY

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A value of of flowrate normalised by pressure difference between formation pressure and bottom hole pressure:

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The definition of flowrate 

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bodyq
 and formation pressure 
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bodyp_e
 may vary depending on application (see Definition specifics on formation pressure and productivity index).


Overall concept is applicable to both producers and injectors but can be split into specific definitionsexplicitly defined as:

Productivity Index of producerInjectivity Index of injector


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J^{\uparrow} = \frac{q^{\uparrow}}{p_e - p_{wf}}



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J^{\downarrow} = \frac{q^{\downarrow}}{p_{wf} - p_e}


LaTeX Math Inline
bodyq^{\uparrow}

production rate

LaTeX Math Inline
bodyq^{\downarrow}

injection rate

So when somone say 


The Productivity Index concept also applies to aquifer expansion:

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