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Productivity Index for injection wells:

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

where

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bodyqq^{\downarrow}

injection rate flowrate (the specification of which may differ, see below)

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bodyp_e

formation pressure

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bodyp_{wf}

bottom hole pressure at sandface under injection


The definition of flowrateinjection rate 

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bodyqq^{\downarrow}
 and formation pressure 
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bodyp_e
 may vary depending on application of productivity index. 

See Also

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Petroleum Industry / Upstream / Production / Subsurface Production / Well & Reservoir Management

Subsurface E&P Disciplines / Production Technology 

Productivity Index ]