Instantaneous gas-oil ratio

Input(s)

$\mathrm{R}_{\mathrm{s}}$: Gas Solubility (SCF/STB)

$\mathrm{k}_{\mathrm{rg}}$: Relative Gas Permeability (dimensionless)

$\mathrm{k}_{\mathrm{ro}}$: Relative Oil Permeability (dimensionless)

$\mu_{\mathrm{o}}$: Viscosity of Oil $(\mathrm{cP})$

$\mu_{\mathrm{g}}$: Viscosity of Gas $(\mathrm{cP})$

$\mathrm{B}_{\mathrm{o}}$: Oil Formation Volume Factor (bbl/STB)

$\mathrm{B}_{\mathrm{g}}$: Gas Formation Volume Factor (bbl/SCF)

Output(s)

GOR: Gas Oil Ratio (SCF/bbl)

Formula(s)

$$ \mathrm{GOR}=\mathrm{R}_{\mathrm{s}}+\frac{\mathrm{k}_{\mathrm{rg}} * \mu_{\mathrm{o}} * \mathrm{~B}_{\mathrm{o}}}{\mathrm{k}_{\mathrm{ro}} * \mu_{\mathrm{g}} * \mathrm{~B}_{\mathrm{g}}} $$

Reference(s)

Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 16 .