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 .