Gas cap shrinkage

Input(s)

$\mathrm{G}_{\mathrm{pc}}$: Cumulative Gas Production from Gas Cap (SCF)

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

$\mathrm{m}$: Gas Cap Ratio (fraction)

$\mathrm{N}$: Oil in Place (STB)

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

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

Output(s)

$\mathrm{G}_{\mathrm{s}}$: Gas Cap Shrinkage (bbl)

Formula(s)

$$ \mathrm{G}_{\mathrm{s}}=\mathrm{G}_{\mathrm{pc}} * \mathrm{~B}_{\mathrm{g}}-\mathrm{m} * \mathrm{~N} * \mathrm{~B}_{\mathrm{oi}} *\left(\left(\frac{\mathrm{B}_{\mathrm{g}}}{\mathrm{B}_{\mathrm{gi}}}\right)-1\right) $$

Reference(s)

Ahmed, T., McKinney, P.D.2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 5, Page: 333 .