Well test analysis of horizontal wells in a two-layered reservoir system: Mathematical derivation

Abstract

In this paper, a well test analysis procedure is discussed for a two-layered oil
reservoir drained from each layer by a horizontal well. Reservoir mathematical model are derived for each layer so that analysis can be done strictly for each layered reservoir. Procedures for obtaining all the directional permeabilities, wellbore skin, degree of crossflow and individual layers average pressures are discussed for a pressure drawdown test procedure