Chapter Eight - Well test analysis for characterizing unconventional gas reservoirs

Abstract

Unconventional well test analysis in multistage fractured reservoirs may be challenging due to extensive wellbore storage effects, significant effects of wellbore dynamics, fracture complexities and heterogeneity of the low permeability reservoirs. Well test analysis tends to have greater uncertainties following clean-up periods when there is multiphase flow of reservoir hydrocarbon with fracturing fluids. To overcome such issues, advanced well test analysis techniques integrated with rate transient analysis (RTA) and wellbore dynamics detection can be used to reduce uncertainties associated with estimation of the reservoir dynamic parameters.