Water expansion term in gas reservoirs
Input(s)
\(B_{g}\): Initial Gas Formation Factor \(\left(\mathrm{MSCF} / \mathrm{ft}^{3}\right)\)
\(c_{w}\): Water Compressibility \((1 / \mathrm{psi})\)
\(s_{w}\): Initial Water Saturation (fraction)
\(c_{f}\): Formation Compressibility \((1 / \mathrm{psi})\)
P: Pressure Differential (psi)
Output(s)
\(E_{f}\): Expansion Term (fraction)
Formula(s)
\[
E_{f}=\frac{B_{g} *\left(c_{w} * s_{w}-c_{f}\right) * P}{1-s_{w}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. Advanced Reservoir Engineering, Gulf Publishing House, Burlington, MA, 2015.