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Dynamic Data Analysis – v5.12.01 - © KAPPA 1988-2017 Chapter - p68/743
3.B.7 Other specialized plots
Infinite Acting Radial flow is the most important but not the only flow regime characterized by
linearity of the pressure response when plotted versus the right time scale. Different flow
regimes require a specific plot of pressure versus the appropriate time scale to quantify
parameters specific to the flow regime.
The main flow regimes are:
Regime Model Linearity vs
Infinite Acting Radial Flow Homogeneous Infinite logarithm of time
Pseudo-Steady State Closed systems time
Pure wellbore storage Wells with storage time
Spherical flow Limited Entry wells inverse of square root of time
Bilinear flow Fractures with Finite Conductivity fourth root of time
Linear flow Fractures square root of time
Linear flow Channel shaped reservoirs square root of time
Semi-linear flow U-shaped reservoirs square root of time
Semi-radial flow Sealing fault logarithm of time
Partial radial flow Intersecting fault logarithm of time
Early time IARF Horizontal well logarithm of time
Linear flow Horizontal well square root of time
Fig. 3.B.7 – Square root plot Fig. 3.B.8 – Fourth root plot
Fig. 3.B.9 – One over square root of time plot Fig. 3.B.10 – MDH plot for intersecting faults