1Department of Chemical Eng., Shahid Bahonar University, P.O. Box 76175-133, Kerman, I.R. IRAN
2Department of Petroleum Eng., Petroleum Industry University, Postcode 63431, I.R. IRAN
Analytical Solutions and type curves for the constant rate radial flow of fluid in both conventional and naturally fractured reservoirs including the effect of wellbore phase redistribution are presented. An automated procedure for non-linear least square minimization using the analytical solutions and their derivatives with respect to the unknown parameters developed to analyze the pressure build up data affected by phase redistribution. Field examples and analysis are also presented.