Abstract: Starting from two phases(oil and water) Darcy's flow,an analytic expression of vertical flow includding gravity channelling,capillary channelling and additional channelling within a vertically heterogeneous reservoir in a cyclic water-flooding has been derived in this paper.Based on J faction,the characteristics of vertical capillary channelling and its effect have been further analyzed.The difference between conventional water flooding and cyclic water flooding has been explained and the mechanism of improved water flooding within a vertically heterogeneous reservoir by cyclic water-flooding has been demonstrated.A theoretical explanation of the widely used cyclic water-flooding is thus provided for its future use.

摘要： 由油水两相达西定律,推导出垂向非均质油层在周期注水作用下油水纵向窜流由重力窜流、毛管力窜流和附加窜流三部分组成的解析表达式.以J函数为基础,分析了毛管力纵向窜流特性及其对开发效果的影响,阐明了周期注水与稳定注水的本质差别,得出垂向非均质油层周期注水改善开发效果力学机理.

关键词: 垂向非均质油层, 周期注水, 重力窜流, 毛管力窜流, 附加压力差, 附加窜流