Statistical regularity of oil-water relative permeability in Daqing Oilfield

Statistical formulas of connate water saturation, water saturation at residual oil, oil relative permeability at connate water saturation, water relative permeability at residual oil with the effective permeability and an average relative permeability curve were obtained on the basis of oil-water relative permeability curves of 617 natural cores in Daqing Oilfield by unstable state experiment. A computing method for some representative relative permeability curve of the reservoir rock with varying permeability was proposed. According to the relative permeability statistical regularity, the water-cut rising regularities of water-drive homogenous reservoirs with well distances of 250 m and 500 m and varying permeability in Daqing Oilfield were investigated by Buckley-Leverrett theory and reservoir numerical simulation.