Determining Effective Fluid Saturation, Relative Permeability, Heterogeneity an Displacement Efficiency in Drainage Zones of Oil Wells Producing Under Waterdrive

摘要

A convenient, practical method is applied for rapid analysis and interpretation of after-water-breakthrough history of oil wells producing under waterdrive for determination of ef-fective fluid saturation, relative permeability, heterogeneity and displacement efficiency. Formulation and methodology are presented for the characterization of parameters of radial unsteady-state flow of oil and water through producing-well drainage regions in oil reservoirs. Validity and capabilities of this approach for diagnosis of conditions in production-well drainage zones in waterdrive reservoirs are confirmed by analysis of typical oil field case scenarios. The present approach is proven to yield significant information of prac-tical importance that can be used for effective selection of potential enhanced oil recovery (EOR)/improved oil recovery (IOR) methods for oil reservoirs.