对CO2驱油过程中油气混相特征的再认识  

RE-UNDERSTANDING OF OIL AND GAS MISCIBLE PHASE CHARACTERISTICS DURING CO2 FLOODING

作　　者：计秉玉[1] 王凤兰[2] 何应付[2,3] 

机构地区：[1]中国石化勘探开发研究院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]西南石油大学,四川成都610500

出　　处：《大庆石油地质与开发》2009年第3期103-109,共7页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技支撑计划课题“二氧化碳气驱提高采收率试验研究”（2006BAB03B06）赞助.

摘　　要：利用理论分析与组分模型数值模拟计算发现，由于油田开发以后油藏不同部位地层压力变化很大，CO2与原油在注入井附近为混相状态，在生产井附近为非混相状态，在井间一定范围内为半混相状态，过去那种简单的混相驱或者非混相驱的概念存在很大局限性。为此，定义了混相体积系数、半混相体积系数和非混相体积系数描述CO2驱混相情况，给出了相应的计算方法，对大庆油田芳48区块和树101区块进行了实例计算。由于大庆油田原油重质含量较高，导致全混相体积系数较低，而非混相体积系数较高，是否大规模开展CO2驱还要通过现场试验及技术经济指标综合评价才能得出结论。Based on theoretical analysis and numerical simulation calculation of composition model, formation pressure in different parts of reservoir has much variation since oilfield put into development, CO2 and oil are miscible near injector, immiscible near producer and half-miscible in a certain interwell range respectively. The earlier simple concepts of miscible and immiscible flooding are significantly limited. Miscible volume factor, halfmiscible volume factor and immiscible volume factor are defined to describe CO2 flooding and provide correspondent calculation method, with calculation cases of Fang 48 and Shu 101 blocks in Daqing Oilfield. High heavy material content in oil of Daqing Oilfield causes low whole-miscible volume factor and high immiscible volume factor. Whether perform large scale of CO2 flooding or not depends on field test or technical and economic indexes.

关 键 词：CO2驱 全混相体积系数 半混相体积系数 数值模拟 

分 类 号：TE357[石油与天然气工程—油气田开发工程]