Ratio of current Water injection rate $\begin{array}{l}q^{\downarrow}_{WI}\end{array}$ to current Liquid production rate $\begin{array}{l}q^{\uparrow}_L\end{array}$ :

(1)	$\begin{array}{l}\displaystyle {\rm PRR} = \frac{q^{\downarrow}_{WI}}{q^{\uparrow}_L}\end{array}$

It is normally calculated for the whole field or its sector and represents one of the key Production Analysis metrics.

Unlike VRR, the PRR does not have a direct correlation with reservoir pressure maintenance and is mostly used as engineering tool for a trackable target in field operations.

Most Reservoir Engineers make their analysis in VRR categories and then translate them into PRR so that Production Technologists can follow up.

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