摘要
中东地区碳酸盐岩储层以孔隙介质为主,注水是未来重要的开发方式,而注入水的性质影响了注水提高采收率的效果。利用中东地区M层碳酸盐岩油藏岩心,通过改变注入水矿化度、钙离子和硫酸根离子质量浓度,研究注入水性质对驱油效果的影响。结果表明,随着注入水矿化度的减小,水驱采收率增大;降低矿场注入水中钙离子质量浓度或相对比例、增加矿场注入水中硫酸根离子质量浓度或相对比例,均有利于提高水驱采收率,改善驱油效果。矿场注水过程中可以通过改变注入水矿化度和离子质量浓度提高驱油效果,还须进一步结合现场水源水量及其他限制条件优选注入水源。
Carbonate reservoirs in Middle East are mainly porous. Water flooding will be a useful development scheme,and water flooding recovery is influenced by properties of injected water. Based on the core displacement experiments of carbonate reservoir in M layer of Middle East,effects of salinity and mass concentration of calcium ion and sulfate ion of the injected water on oil displacement were studied. The results show that water flooding recovery can be effectively enhanced and oil displacement can be effectively improved when the salinity and calcium ion concentration of injected water decrease and sulfate ion concentration of injected water increases. The oil displacement effect may be enhanced through the change of salinity and ion mass concentration of the injected water in the process of water flooding in the field. The experiment results can be used for guiding optimal selection and improving the source of injected water of carbonate reservoir in M layer of Middle East.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2017年第2期116-120,共5页
Petroleum Geology and Recovery Efficiency
基金
中国石油科技重大专项"中国石油海外油气上产2亿吨开发关键技术研究"(2011E-2501)
关键词
碳酸盐岩
注入水性质
矿化度
离子组成
驱油效果
中东地区
carbonate rock
properties of injected water
salinity
ionic composition
oil displacement effect
the Middle East area
