Dimensionless pressure (radial-flow/constant pressure production)
Input(s)
\(P_{i}\): Initial Reservoir Pressure (psi)
\(P\): Final Reservoir Pressure (psi)
\(P_{w f}\): Well Flowing Pressure (psi)
Output(s)
\(P_{d}\): Dimensionless Pressure (dimensionless)
Formula(s)
\[
P_{d}=\frac{P_{i}-P}{P_{i}-P_{w f}}
\]
Reference(s)
Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of Petroleum Engineers, Page: 9.