Abstract: The fractured-vuggy reservoir in Tahe oilfield is characterized by strong heterogeneity. This paper presents a geologic model for reservoirs with varied permeability in Tahe oilfield, including the water fractional flow equation for such a reservoir after partial perforation derived by oil-gas flow theory, and analyzes the impacting factors on the fractional flow curves. The study shows that the derived equation can be used to precisely describe the water cut variations under the different reservoir conditions and the different producing pressure differentials. The proposed theory could be as a guide for production performance analysis and prediction of other fractured-vuggy reservoirs with bottom water.

Key words: Tarim basin, bottom-water reservoir, fractional flow equation, water cut