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Ratio of the variation of the field-average formation pressure in producers to the total field cumulative water injection
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{\rm PIR}(T\delta t) = \frac{ \left<p_e(t=T+\delta t) \right>-\left<p_e(t=0)\right>}{Q_{WI}(t=T+\delta t) - Q_{WI}(t=0) } |
It measures how efficiently waterflood supports the formation pressure in producers and represents one of the key Waterflood Diagnostics.
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