Gas expansion factor
Input(s)
\(\mathrm{E}_{\mathrm{gi}}\): Initial Gas Expansion Factor (SCF/bbl)
A: Drainage Area (acres)
\(\mathrm{h}\): Thickness \((\mathrm{ft})\)
Ø: Porosity (fraction)
\(\mathrm{S}_{\mathrm{wi}}\): Initial Water Saturation (fraction)
\(\mathrm{G}_{\mathrm{p}}\): Gas Produced \((\mathrm{SCF})\)
Output(s)
\(\mathrm{E}_{\mathrm{g}}\): Gas Expansion Factor \((\mathrm{SCF} / \mathrm{bbl})\)
Formula(s)
\[
\mathrm{E}_{\mathrm{g}}=\mathrm{E}_{\mathrm{gi}}-\left(\frac{1}{43560 * \mathrm{~A} * \mathrm{~h} * \emptyset *\left(1-\mathrm{S}_{\mathrm{wi}}\right)}\right) * \mathrm{G}_{\mathrm{p}}
\]
Reference(s)
Ahmed, T., McKinney, P.D.2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3, Page: 202.