Shape factor - Earlougher
Input(s)
m: Slope of Transient Semi-log Straight Line (psi/log cycle)
\(\mathrm{m}\): Slope of Semi-steady State Cartesian Straight Line (psi/h)
\(\mathrm{P}_{1 \mathrm{hr}}\): Pressure at \(t=1 \mathrm{~h}\) from Transient Semi-log Straight Line (psi)
\(P_{f}\): Pressure at \(t=0\) from Pseudo-steady State Cartesian Straight Line (psi)
Output(s)
\(\mathrm{C}_{\mathrm{A}}\): Shape Factor (dimensionless)
Formula(s)
\[
\mathrm{C}_{\mathrm{A}}=5.456 *\left(\frac{\mathrm{m}}{\mathrm{m}^{\prime}}\right) * \exp \left(2.303 * \frac{\mathrm{P}_{1 \mathrm{hr}}-P \int}{\mathrm{m}^{\prime}}\right)
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 47.