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建立了裂缝性砂岩油藏周期注水数学模型 ,分别给出了数学模型的数值解和解析解 .应用该模型进行了周期注水模拟计算 ,分析了裂缝与基质孔隙度比值、油水粘度比、基质毛管力、周期注水开始时间、注水周期等因素对周期注水效果的影响 .结果表明 ,油水粘度比越小 ,基质的毛管力越大 ,裂缝性砂岩油藏周期注水的效果越好 ;当裂缝与基质孔隙度比值小于 0 .0 5时 ,周期注水与连续注水几乎没有差别 ;当裂缝与基质孔隙度比值大于 0 .2时 ,水驱采收率能够提高 2 .5%以上 .
The mathematical model of periodic injection of fractured sandstone reservoir is set up and the numerical solution and analytical solution of the mathematical model are given respectively.The cyclic injection simulation calculation is carried out by using this model and the ratio of fracture to matrix porosity, viscosity ratio of oil to water, The results show that the smaller the viscosity ratio of oil to water is, the larger the capillary force of matrix is, and the better the effect of periodic injection of water in fractured sandstone reservoirs. When the ratio of fracture to matrix When the porosity ratio is less than 0.05, there is almost no difference between cyclic injection and continuous injection; when the ratio of fracture to matrix porosity is greater than 0.2, the waterflood recovery can be increased by 2.5%.