The formation pressure, time constant, and buildup magnitude can be determined by multiple linear regression of the buildup pressure curve [30, 31, 35].
(7) Test the response of buildup pressure for FPTWD.
The final buildup pressure decreases with permeability, while the pressure buildup amplitude increases with permeability.
A method for correcting pressure buildup pressure data free of wellbore storage effects at early times has been developed by Russell .
Vienot, "Rate normalization of buildup pressure by using afterflow data," Journal of Petroleum Technology, vol.