【作者】 吴春新； 苏玉亮；

【Author】 Wu Chunxin,Su Yuliang (School of Petroleum Engingeering,China University of Petroleum,Dongying 257061,China)

【机构】 中国石油大学(华东)石油工程学院；

【摘要】 建立了考虑启动压力梯度的一维二氧化碳非混相驱油数学模型,并对其进行数值求解,分析了启动压力梯度和二氧化碳的特性对特低渗透油藏驱替特征的影响。计算结果表明:启动压力梯度的存在导致平均含气饱和度降低和含气率上升较快,驱替效率降低;二氧化碳在驱油过程中,对原油具有降黏膨胀作用,驱油效果较好。更多还原

【Abstract】 A linear dimension immiscible carbon dioxide displacement mathematics model considering threshold pressure gradient and Characteristics of carbon dioxide which describes extremely low permeability reservoir is established,after numerical resolution,analyze the influence of threshold pressure gradient and characteristics of carbon dioxide on the displacement characteristics of extremely low permeability reservoir.The results show that;the existence of threshold pressure gradient led to lower average gas saturation and gas rate increased rapidly,reducing the efficiency of displacement; during carbon dioxide flooding,the expansion and viscosity reduction of crude oil make effect displacement better.更多还原