Cumulative gas production - Tarner's method

Input(s)

$N$ : Initial Oil-in Place (STB)

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

$R_{s i}$ : Initial Gas Solubility $(\mathrm{SCF} / \mathrm{STB})$

$B_{o}$ : Oil Formation Volume Factor at the Assumed Reservoir Pressure (bbl/STB)

$B_{o i}$ : Oil Formation Volume Factor at Initial Reservoir Pressure (bbl/STB)

$B_{g}$ : Gas Formation Volume Factor at the Assumed Reservoir Pressure (bbl/SCF)

$N_{p}$ : Cumulative Oil Production (STB)

$G_{p}$ : Cumulative Gas Production (SCF)

G_{p}=N *\left[\left(R_{s i}-R_{s}\right)-\left(\frac{B_{o i}-B_{o}}{B_{g}}\right)\right]-N_{p} *\left[\frac{B_{o}}{B_{g}}-R_{s}\right]

Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 5, Page: 340 .