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 .