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.