Reservoir heterogeneity is one of the main barriers that affect reservoir developing efficiently in the presence of a strong aquifer support. To identify high permeability channels, a coupled model of two phase flow in the formation and variable mass flow in the horizontal wellbore has been built in this paper. Keep the average vertical permeability and the permeability variation coefficient constant, change the distribution of vertical permeability, on the basis of which we can get different relations between cumulative watercut and oil recovery. The study shows that if there is a high permeability channel along the wellbore, a line segment and an inflexion will appear on the curve of cumulative watercut and oil recovery in semi-log coordinate when oil recovery reaches some value. The closer the distance between the high permeability channel and the heel is, the earlier the inflexion and the line segment will appear. At last, the actual curve is compared with the theoretical ones in the oil recovery when the inflexion and the line segment appear, by means of which the high permeability channel could be identified. The result calculated through the method is similar to the well log interpretation, and the method can be popularized.
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