DefinePK

Abstract

Power-law fluids are very common in the oilfield industry. Engineers find them in completion and stimulation treatment works when using such fluids as polymers, foams and some heavy crude oils which obey a non-Newtonian model. Therefore, engineers must be able to identify and characterize pressure transient behavior on such systems. Several expressions have been developed to find reservoir permeability and skin factors. The most recent use the TDS Technique which basically uses some characteristic points and features on the pressure and pressure derivative versus time log-log plot. In this work a modification of the TDS Technique is introduced to account for a shorter version of a pressure solution model that makes a slight change in the determination of the slope of the pressure derivative curve during radial flow regime. The proposed simplification initially came with a trial-and-error procedure which is somehow tedious. Although, the variation is small, a tremendous impact on the permeability and skin factor calculation is found with absolute error values up to 76%.