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It measures how efficiently waterflood supports the oil production.
The PIR can be expressed through related to the current VRR as:
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{\rm PIR}= \frac{1}{\rm VRR} \cdot \frac{1-Y_w}{Y_w + (1-Y_w) \, \left[ \frac{B_o}{B_w} + \frac{B_g}{B_w} \, ( {\rm GOR} - R_s) \right] } |
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