Dimensionless buildup time
Input(s)
\(k\): Effective Permeability of Flowing Phase (D)
\(t\): Time (h)
\(\varnothing\): Porosity (Per cent)
\(\mu\): Viscosity of Flowing Fluid (cP)
\(c_{t}\): Total System Effective Isothermal Compressibility \(\left(\mathrm{kg} / \mathrm{cm}^{2}\right)^{-1}\)
\(r_{w}\): Well Radius (m)
Output(s)
\(t_{D}\): Dimensionless time (dimensionless)
Formula(s)
\[
t_{D}=\frac{0.3604 k t}{\varnothing \mu c_{t} r_{w}^{2}}
\]
Reference(s)
Ramey Jr, H. J. (1981). Reservoir Engineering Assessment of Geothermal Systems. Department of Petroleum Engineering, Stanford University, Page: (5.7).