Percentage of total hydrocarbon reserves recovered by a given time moment $\begin{array}{l}t\end{array}$ :

(1)	$\begin{array}{l}\displaystyle {\rm RF}(t) = \frac{{ \rm V_{recovered \ reserves}}(t)}{{\rm V_{total \ reserves}}}\end{array}$

It always ranges $\begin{array}{l}0 \leq {\rm RF}(t) \leq {\rm EUR} \leq 100 \%\end{array}$ and is related to Depletion Factor (DF) as:

(2)	$\begin{array}{l}\displaystyle {\rm RF} (t) = {\rm EUR} \cdot {\rm DF}(t)\end{array}$

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