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