摘要
CO2-原油体系的最小混相压力是CO2驱油技术研究中的一个重要参数。采用高压悬滴法测定了延长油田特低渗油藏原油在44℃油藏温度下CO2-原油体系界面张力随压力的变化。实验结果表明:CO2-原油两相间的界面张力随体系压力的升高而呈近线性下降趋势。根据外推法得出两相体系界面张力为0时的最小混相压力为23.56 MPa。利用该方法既可以较精确地得到CO2-原油体系最小混相压力数据,又可以直接地观察到CO2-原油混相互溶时的状态。实验操作时间较短,且简单易行,对同类实验的测定方法具有一定的参考价值。
The minimum miscibility pressure of CO2 and crude oil system is an important parameter for the research of CO2 flooding technology. The interfacial tension data of CO2 and crude oil system were measured by pendant drop method under the conditions of reservoir temperature of 44℃ and different pressure. The oil samples are produced in low permeability reservoir of Yanchang Oilfield. The experiment results show that the interfacial tension of CO2 and crude oil decreased almost linearly as increasing pressure. According to the extrapolated method, the minimum miscibility pressure is 23.56 MPa when the interracial tension of CO2 and crude oil is zero. This method can be used to not only obtain the minimum miscibility pressure of C02 and crude oil system, but also directly observe the miscible phase picture of CO2 and crude oil. The experiment is easier in operation and needs less time than the others, so it has a certain reference value on the measurement for similar experiments.
出处
《岩性油气藏》
CSCD
北大核心
2015年第1期127-130,共4页
Lithologic Reservoirs
基金
国家科技支撑计划项目"陕北煤化工CO2捕集
埋存与提高采收率技术示范"(编号:2012BAC26B00)资助
关键词
界面张力
最小混相压力
二氧化碳
悬滴法
inteffacial tension
minimum miscibility pressure
carbon dioxide ： pendant drop method
