Compressibility of a coalbed methane formation
Input(s)
\(W_{i}\): Total Volume of Water in the Reservoir (bbl)
\(W_{p}\): Total Volume of Water Removed (bbl)
\(P_{i}\): Initial Reservoir Pressure (psi)
\(P_{d}\): Desorption Pressure (psi)
Output(s)
\(c_{t}\): Total Compressibility \((1 / \mathrm{psi})\)
Formula(s)
\[
c_{t}=\left(\frac{1}{W_{i}}\right) *\left(\frac{W_{p}}{P_{i}-P_{d}}\right)
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter:3, Page: 219.