Abstract: 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.

Key words: sandstone reservoir, relative permeability, statistical regularity, reservoir numerical simulation, water-cut variation, Daqing Oilfield

摘要： 以大庆油田617个天然岩心测量的非稳态油水相对渗透率曲线为样本,统计得到了束缚水饱和度、残余油下水饱和度、束缚水下油相相对渗透率、残余油下水相相对渗透率与有效渗透率间的统计关系和平均相对渗透率曲线,给出了利用油水相对渗透率统计规律计算不同渗透率储层岩石代表性的油水相对渗透率曲线的方法。根据相对渗透率的统计规律,用Buckley-Leverrett水驱理论和油藏数值模拟方法,研究了大庆油田不同渗透率级别的均质油藏,在250m和500m井距下水驱开采的含水上升规律。

关键词: 砂岩储层, 相对渗透率, 统计规律, 油藏数值模拟, 含水率变化, 大庆油田