Cumulative effective compressibility - Fetkovich
Input(s)
\(S_{w i}\): Initial Water Saturation (fraction)
\(\bar{c}_{w}\): Cumulative Total Water Compressibility \((1 / \mathrm{psi})\)
M: Dimensionless Volume Ratio (dimensionless)
\(\bar{c}_{f}\): Total PV (Formation) Compressibility \(\left(\mathrm{psi}^{-1}\right)\)
Output(s)
\(\bar{c}_{e}\): Effective Compressibility \((1 / \mathrm{psi})\)
Formula(s)
\[
\bar{c}_{e}=\frac{S_{w i} * \bar{c}_{w}+M *\left(\bar{c}_{f}+\bar{c}_{w}\right)+\bar{c}_{f}}{1-S_{w i}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3, Page: 215,216 .