Dimensionless wellbore storage coefficient of radial flow - Constant-rate production

Input(s)

$\mathrm{h}$: Reservoir Thickness (ft)

C: Wellbore Storage Coefficient (STB/psi) $\varnothing$: Porosity (fraction)

$\mathrm{c}_{\mathrm{t}}$: Total Compressibility $(1 / \mathrm{psi})$

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

Output(s)

$\mathrm{C}_{\mathrm{d}}$: Dimensionless Wellbore-Storage Coefficient (dimensionless)

Formula(s)

$$ \mathrm{C}_{\mathrm{d}}=\frac{0.8936 * \mathrm{C}}{\emptyset * \mathrm{c}_{\mathrm{t}} * \mathrm{~h} * \mathrm{r}_{\mathrm{w}}^{2}} $$

Reference(s)

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