特高含水油藏CO_2微观驱油机制  

Research on microcosmic oil displacement mechanism of CO_2 flooding in extra-high water cut reservoirs

作　　者：崔茂蕾 王锐[1,2,3] 吕成远 伦增珉[1,2,3] 赵淑霞[1,2,3] 王友启 唐永强[1,2,3] 

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100083 [2]中国石化海相油气藏开发重点实验室,北京100083 [3]中国石化石油勘探开发研究院,北京100083

出　　处：《中国石油大学学报（自然科学版）》2018年第1期119-125,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家油气重大专项(2016ZX05048003)

摘　　要：根据常见的水驱剩余油类型,提出盲端、孤岛、簇状3种理想剩余油微观模型,应用自主研发的高温高压微观可视化实验装置研究特高含水对CO_2与剩余油的微观作用过程影响,建立CO_2与油水接触的微观数学模型。结果表明:水的屏蔽作用明显延缓了CO_2与原油的微观接触过程,使得混相过程更加复杂化,无论水膜厚度多大,CO_2都能穿透水膜溶解于剩余油中;注入压力越高,CO_2在的扩散速度越快,达到混相的时间越短;CO_2混相驱能够在水驱的基础上进一步提高原油采收率;高含水油藏在实施CO_2驱过程中应采用高压低速的注气方式。On the basis of the residual oil forms after water flooding,three kinds of ideal core models were proposed,which are dead-end model,shaped island model,and cluster model.The microcosmic process influence of extra-high water cut on CO_2 and residual oil was investigated using a micro-visualization experiment device,which was independent developed under high temperature and high pressure.And the microcosmic mathematic model of CO_2-water-oil interaction was established.The results show that water blocking significantly postpones the micro contact process between CO_2 and trapped oil,which makes the miscible process more complex.And no matter how thick the water film is,CO_2 can diffuse through the water film into the trapped oil.Higher injection pressure leads to the faster CO_2 diffusion into oil,which results in achieving more easily miscibility.It is concluded that CO_2 miscible displacement contributes to oil recovery largely after water flooding.And High-pressure low-rate injection mode of CO_2 is suggested in extra-high water cut reservoir.

关 键 词：特高含水油藏 高温高压 CO2混相驱 可视化 微观驱油机制 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]