延长油田特低渗油藏注CO_2对储层物性影响研究  

The Influence of Reservoir Properties Induced by CO_2 Injecting in Ultra-low Permeability Reservoir of Yanchang Oilfield

作　　者：汤瑞佳 江绍静 黄春霞 余华贵 王贺谊 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《石油石化节能与减排》2015年第4期21-25,共5页

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";项目编号:2012BAC26B00

摘　　要：CO2地质封存技术作为CO2减排重要方法之一已得到国际社会普遍认可。CO2-EOR技术利用CO2提高原油采收率的同时又能解决CO2排放问题,实现CO2地质封存,达到生产"绿色石油"目的。以延长油田靖边特低渗油藏储层岩石为研究对象,研究了注CO2前后储层物性变化规律,包括岩石孔隙度、渗透率和润湿性。实验结果表明:压力升高,岩心孔隙度增大;温度、压力升高,岩心渗透率呈增大趋势;CO2—岩石—地层水作用后,岩石表面亲水性增强;岩石—CO2—地层水相互作用后储层岩石及其胶结物发生了溶蚀,同时伴随碎屑颗粒物在多孔介质中的运移,综合作用导致储层岩石的孔隙结构和渗透率发生了改变。The technology of CO2 storage as one of the important methods for CO2 emissions has been widely recognized by the international community. Using CO2 for enhanced oil recovery while solving the problem of CO2 emissions, it can be achieved geological storage of CO2 and production of 'green oil'. With the rock of ultralow permeability reservoir of Yanchang oilfield for the study, the variation of reservoir properties is studied before and after CO2 injecting, including rock porosity, permeability and wettability. The results show that: with the pressure increases, the porosity of core is increasing trend; with temperature and pressure rise, the permeability of core basically shows increasing trend; When CO2- rock- formation water interactions, the surface hydrophilic of the rock will be enhanced. In the CO2 storage and flooding process, not only the dissolution of rock and cement, but also accompanied by migration of debris particles in the formation. The result of mixing is the pore structure and permeability of rock changed.

关 键 词：二氧化碳 溶蚀 储层物性 润湿性 渗透率 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]