二氧化碳非混相驱油粘性指进表征方法及影响因素  

Characterization and controlling factors analysis on viscosity fingering during CO_2 immiscible drive

作　　者：李东霞[1] 苏玉亮[2] 高海涛[3] 吴春新[2] 姜书荣[4] 

机构地区：[1]中国石油大学(华东)物理科学与技术学院,山东东营257061 [2]中国石油大学(华东)石油工程学院,山东东营257061 [3]中国石化股份胜利油田分公司纯梁采油厂,山东滨州256504 [4]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2010年第3期63-66,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家重点基础研究发展规划"973"项目"温室气体提高石油采收率的资源化利用及地下埋存"(2006CB705804);泰山学者建设工程专项经费资助项目(TS20070704)

摘　　要：针对二氧化碳非混相驱油过程中的粘性指进问题,建立数学模型并进行求解,研究了一维CO_2非混相驱油粘性指进的表征方法,重点分析注采压差与油层温度等因素对CO_2非混相驱油粘性指进的影响,并回归了这些因素对CO_2非混相驱油粘性指进的影响规律。结果表明,CO_2非混相驱油时粘性指进距离随驱替时间的推进呈指数形式增长。在计算参数范围内,相同油层温度下,当注采压差小于7MPa时,随着注采压差的增大,CO_2非混相驱油粘性指进程度增大;当注采压差大干7MPa时,随着压差增大,粘性指进程度逐渐降低。注采压差一定时,随着油层温度升高,CO_2在原油中的溶解度降低,原油粘度降低速度减缓,油气流度比增大,CO_2非混相驱油粘性指进程度高。A mathematical model for the immiscible flood of CO_2 is built and solved to study the characterizing methods of viscous fingering for linear dimension immiscible flood of CO_2,in which the influence of the drawdown pressure and the reservoir temperature is especially analyzed, and the regression curve is also obtained.The results indicate that with displacement time increases,the viscosity fingering velocity of CO_2 speeds up exponentially.At the same temperature,the level of the viscosity fingering increases with the increase of the drawdown pressure when the injector-producer drawdown pressure is less than 7MPa,which gradually decreases when the injector-producer drawdown pressure is more than 7MPa.At the same injector-producer drawdown pressure,with the increase of reservoir temperature,the solubility of CO_2 decreases and the oil-gas mobility ratio increases,which favors the fingering level.

关 键 词：二氧化碳驱油 粘性指进 表征方法 影响因素 

分 类 号：TE357.42[石油与天然气工程—油气田开发工程]