Dimensionless storage constant for gases
Input(s)
\(C^{\prime}\): Wellbore Storage \(\left(\right.\) tons \(\left./\left(\mathrm{kg} / \mathrm{cm}^{2}\right)^{2}\right)\)
Z: Real Gas Law Deviation Factor (ratio)
T: Absolute Formation Temperature \(\left({ }^{\circ} \mathrm{K}\right)\)
M: Molecular Weight \((\mathrm{g} / \mathrm{g} \mathrm{mol})\)
\(\varnothing\): Porosity (Per cent)
\(h\): Net Formation Thickness (m)
\(c_{t}\): Total System Effective Isothermal Compressibility \(\left(\mathrm{kg} / \mathrm{cm}^{2}\right)^{-1}\)
\(r_{w}\): Well Radius \((\mathrm{m})\)
Output(s)
\(C_{D}\): Dimensionless Storage Constant for Gases (dimensionless)
Formula(s)
\[
C_{D}=\frac{27 C^{\prime} Z T}{M \varnothing h c_{t} r_{w}^{2}}
\]
Reference(s)
Ramey Jr., H. J. (1981). Reservoir Engineering Assessment of Geothermal Systems. Department of Petroleum Engineering, Stanford University, Page: (5.18).