考虑毛管滞后的周期注水作用机理数值模拟  

Numerical simulation study on cyclic water flooding mechanism considering capillary hysteresis

作　　者：姜瑞忠[1] 卫喜辉[1,2] 王世朝 姜宇[3] 单理军 王睿恒[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中海石油(中国)有限公司深圳分公司,广东广州510240 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《油气地质与采收率》2013年第4期49-52,114,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2008ZX05013-002)

摘　　要：目前大多数周期注水开发油藏数值模拟计算的开发效果都好于实际油藏周期注水的开发效果。采用数值模拟方法,对周期注水中的毛管滞后现象和考虑毛管滞后的周期注水作用机理进行了研究。结果表明,周期注水时,含水饱和度变化方向发生周期性变化,其原因是油藏驱替过程中驱替和吸入交替进行,进而导致毛管滞后;毛管滞后将产生新的毛管压力曲线,它位于驱替毛管压力曲线和吸入毛管压力曲线之间。周期注水中毛管压力是主要的作用力,考虑毛管滞后时高、低渗透层间流体交渗量和高、低渗透网格间油的交渗量都小于不考虑毛管滞后(采用驱替毛管压力曲线)时的交渗量。考虑毛管滞后的周期注水数值模拟的开发效果较符合油田开发实际。Currently,the simulation results of most cyclic water flooding reservoirs are better than the observation of the practical cyclic water flooding reservoir.To solve this problem,the capillary hysteresis and cyclic water flooding mechanism considering capillary hysteresis are analyzed by numerical simulation.It is concluded that the water saturation direction in the cyclic water flooding is changed periodically,this means that the reservoir displacement mode alternates the drainage process and imbitition process,and the phenomenon of capillary hysteresis prevail in the reservoir.The capillary hysteresis will generate a new capillary pressure curve which lies in the drainage capillary pressure curve and imbitition capillary pressure curve.The capillary pressure is the main force in cyclic water flooding.When considering the capillary hysteresis,the liquid flux between high permeable layer and low permeable layer and the oil flux between high permeable grid and low permeable grid are less than that of the case not considering the capillary hysteresis(drainage capillary pressure curve is used).With the consideration of capillary hysteresis,the simulation results correspond to that of the practical reservoir.

关 键 词：周期注水 毛管滞后 数值模拟 作用机理 毛管压力 

分 类 号：TE319[石油与天然气工程—油气田开发工程]