Dimensionless radius of radial flow - Constant-rate production

Input(s)

r: Effective Radius/Reservoir Radius (ft)

$\mathrm{r}_{\mathrm{w}}$: Wellbore Radius ( $\mathrm{ft}$ )

Output(s)

$\mathrm{r}_{\mathrm{d}}$: Dimensionless Radius (dimensionless)

Formula(s)

$$ \mathrm{r}_{\mathrm{d}}=\frac{\mathrm{r}}{\mathrm{r}_{\mathrm{w}}} $$

Reference(s)

Lee, J., Rollins, J. B., \& Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of Petroleum Engineers, Page: 8.