Dimensionless wellbore storage coefficient (compressible fluids for pressure build-up test)
Input(s)
C: Well Bore Storage Coefficient (bbl/psi)
\(\emptyset\): Porosity (fraction)
\(c_{f}\): Formation Compressibility (1/psi)
\(\mathrm{h}\): Pay zone Thickness (ft)
\(r_{w}\): Well Bore Radius (ft)
Output(s)
\(\mathrm{C}_{\mathrm{d}}\): Dimensionless Wellbore Storage Coefficient (dimensionless)
Formula(s)
\[
C_{d}=\frac{0.8936 * C}{\emptyset * c_{f} * h * r_{w}^{2}}
\]
Reference(s)
Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of Petroleum Engineers, Page: 105.