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 .