Effective compressibility in undersaturated oil reservoirs - Hawkins
Input(s)
\(\mathrm{S}_{\mathrm{oi}}\): Initial Oil Saturation (fraction)
\(\mathrm{S}_{\mathrm{wi}}\): Initial Water Saturation (fraction)
\(\mathrm{c}_{\mathrm{o}}\): Oil Compressibility \((1 / \mathrm{psi})\)
\(\mathrm{c}_{\mathrm{w}}\): Water Compressibility \((1 / \mathrm{psi})\)
\(\mathrm{c}_{\mathrm{f}}\): Formation Compressibility \((1 / \mathrm{psi})\)
Output(s)
\(\mathrm{c}_{\mathrm{e}}\): Effective Compressibility (1/psi)
Formula(s)
\[
\mathrm{c}_{\mathrm{e}}=\frac{\mathrm{S}_{\mathrm{oi}} * \mathrm{c}_{\mathrm{o}}+\mathrm{S}_{\mathrm{wi}} * \mathrm{c}_{\mathrm{w}}+\mathrm{c}_{\mathrm{f}}}{1-\mathrm{S}_{\mathrm{wi}}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 5, Page: 334 .