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.