Ratio of Cumulative water production $\begin{array}{l}Q^{\uparrow}_W\end{array}$ to Cumulative oil production (QO) $\begin{array}{l}Q^{\uparrow}_O\end{array}$ :

(1)	$\begin{array}{l}\displaystyle ΣY_w = \frac{Q^{\uparrow}_W}{Q^{\uparrow}_O}\end{array}$

where

$\begin{array}{l}Q^{\uparrow}_W\end{array}$	Cumulative water production
$\begin{array}{l}Q^{\uparrow}_O\end{array}$	Cumulative oil production

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