Hydrocarbon pore volume occupied by evolved solution gas
Input(s)
\(\mathrm{N}\): Initial Oil in Place (STB)
\(\mathrm{N}_{\mathrm{p}}\): Cumulative Oil Production (STB)
\(\mathrm{R}_{\mathrm{si}}\): Gas Solubility at Initial Reservoir Pressure (SCF/STB)
\(\mathrm{R}_{\mathrm{s}}\): Current Gas Solubility (SCF/STB)
\(\mathrm{B}_{\mathrm{g}}\): Current Gas Formation Volume Factor (bbl/SCF)
\(\mathrm{R}_{\mathrm{p}}\): Net Cumulative Produced Gas-Oil Ratio (SCF/STB)
Output(s)
V: Volume of the Evolved Gas that Remains in the PV (PV)
Formula(s)
\[
\mathrm{V}=\left(\mathrm{N} * \mathrm{R}_{\mathrm{si}}-\mathrm{N}_{\mathrm{p}} * \mathrm{R}_{\mathrm{p}}-\left(\mathrm{N}-\mathrm{N}_{\mathrm{p}}\right) * \mathrm{R}_{\mathrm{s}}\right) * \mathrm{~B}_{\mathrm{g}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4, Page: 301 .