降低CO_2驱最小混相压力的调节剂研究  

Studies on the chemical agent system for reducing in the minimal miscibility pressure of CO_2 flooding

作　　者：吴莎[1] 何佳[2] 李遵照[1] 林伟民[1] 王青涛[3] 吴发英[1] 赵斌[1] 张俊瑾[1] 

机构地区：[1]中国石化中原油田分公司石油工程技术研究院,河南濮阳457001 [2]中国石化中原石油工程设计有限公司,河南濮阳457001 [3]中国石化中原油田分公司油气技术部,河南濮阳457001

出　　处：《中国科技论文》2015年第18期2161-2164,共4页China Sciencepaper

基　　金：国家油气科技重大专项资助项目(2008ZX05009-004-02)

摘　　要：针对中原油田部分区块油藏CO2驱最小混相压力高于地层压力,不能实现混相驱的问题,采用高温高压界面张力仪测定了5种不同类型化学试剂（乙二醇丁醚、柠檬酸异丙酯、烷基酚聚氧乙烯醚、司盘80和混苯）对CO2与原油间界面张力的影响。实验表明,加入调节剂能够降低CO2与原油间的界面张力,界面张力降低幅度范围在8.55%~25.51%之间。通过油溶性表活剂与混苯进行复配实验,优选了一种具有协同增效作用的调节剂体系。采用界面张力消失法测定了CO2与原油间最小混相压力。结果表明,该调节剂能够降低CO2与原油间的界面张力,从而降低CO2与原油间最小混相压力17.86%。Based on the minimum miscibility pressure（MMP）in the part of the Zhongyuan Oilfield block reservoir is higher than the formation pressure and CO2 flooding is hard to form miscible.The effect of five different chemicals（diethylene glycol monobutyl ether,isopropyl citrate,alkylphenol polyoxyethylene ether,Span 80 and mixed benzene）on the interfacial tension of CO2 and the formation of oil was measured using an interfacial tensiometer.The results show that adding chemical regulators into the crude oil can reduce the interfacial tension of CO2 and crude oil 8.55%-25.51%.A chemical regulator with synergistic interaction characteristics was obtained through a formulation experiment and derived from the surfactant and mixed benzene.The MMP between the CO2 and crude oil was measured using the vanishing interfacial tensions technique.The experimental results show that the chemical regulators obtained in this study can reduce the interfacial tension between CO2 and crude oil,thereby reducing the MMP between CO2 and crude oil by 17.86%.

关 键 词：CO2驱 最小混相压力 界面张力 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]