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).