Ratio of cumulative oil production  to STOIIP :

{\rm RFO} = \frac{Q^{\uparrow}_O}{V_{\rm STOIIP}}

Proxy Model NDR

For waterless period of production:

{\rm RFO} = \frac{c_t \cdot (p_i - p_e)}{1-s_{wi}}

where

Proxy Model WF

For isotropic homogenous water propagation and pressure maintenance at initial formation pressure:

{\rm RFO} = E_S \cdot E_D

where

See Also

Petroleum Industry / Upstream /  Production / Subsurface Production / Field Study & Modelling / Production Analysis / Recovery Factor

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