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根据非均质砂岩油田地质特点 ,设计了平面非均质和纵向非均质岩心实验物理模型 ,进行了周期注水和常规注水驱油实验 .结果表明 ,周期注水有效地改善了纵向非均质砂岩油藏的开发效果 .对于平面非均质岩心 ,水驱采收率提高幅度为 1.0 %～ 1.5% ;对于纵向非均质岩心 ,水驱采收率提高幅度为 1.5%～ 2 .5% .实验过程中 ,由于忽略了弹性力的作用 ,从而验证了毛管力是周期注水的主要影响因素之一 .毛管力的宏观作用是引起高低渗透层位间的流体交换 ;微观作用是引起封闭式孔隙、细网通道与粗网通道之间的流体交换 .
According to the geological characteristics of heterogeneous sandstone oilfield, the experimental physical model of planar heterogeneous and longitudinal heterogeneous cores was designed and the experiments of cyclic water injection and conventional water flooding were carried out. The results show that cyclic water injection can effectively improve the longitudinal heterogeneity of sandstone For a planar heterogeneous core, the increase of waterflood recovery is 1.0% ~ 1.5%, while for longitudinal heterogeneous core, the waterflood recovery is increased by 1.5% ~ 2.5%. In the process of experiment, because of neglecting the effect of elastic force, it is verified that the capillary force is one of the main factors affecting the cyclic water injection. The macroscopic effect of capillary force is to cause the fluid exchange between the high and low permeable beds; the microscopic effect is caused by closed pores , Fluid exchange between fine mesh and coarse mesh channels.