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Percentage of currently recovered  hydrocarbon reserves 

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body--uriencoded--Q_%7BHC%7D
from the Surface Tank Hydrocarbon Initial In Place (STHCIIP):

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{\rm RF}(t) = \frac{{ \rm VQ_{recovered \ reservesHC}}(t)}{{\rm V_{\rm STHCIIP}}} \cdot 100 \%


It always ranges 

LaTeX Math Inline
body--uriencoded--0 \leq %7B\rm RF%7D(t) \leq %7B\rm EUR%7D EURF%7D \leq 100 \%25
and is related to Depletion Factor (DF) as:

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{\rm RF} (t) = {\rm EUREURF} \cdot {\rm DF}(t)

where EUR is Estimated Ultimate Recovery.

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