润湿性的改变对提高原油采收率的影响研究  

Research on the Influence of Wettability Alteration upon Enhanced Oil Recovery

作　　者：付美龙[1,2] 周玉霞[2] 

机构地区：[1]湖北省油气钻采工程重点实验室 [2]长江大学石油工程学院,湖北武汉430100

出　　处：《石油天然气学报》2012年第12期128-132,9,共5页Journal of Oil and Gas Technology

基　　金：湖北省自然科学基金重点项目(2011CDA022)

摘　　要：注水开发几乎不能从低渗油湿性油藏中采出原油,如果油藏岩石的润湿性得到改变,通过自然的渗吸其采收率就能得到改进。因此,了解润湿性改变的影响因素及其机理对提高原油采收率意义重大。岩心流动试验表明:水驱时中性润湿岩心的采收率最高,强水湿岩心其次,强油湿岩心最低。润湿性由亲油向亲水方向的变化,油水相渗曲线右移,残余油饱和度下降了25%,油水共渗区范围明显增大,采出程度提高。目前认为加入表活剂改变油藏岩石的润湿性是提高原油采收率比较可行的方法。Waterflooding almost could not produce oil from low permeability and oil-wet reservoirs,oil recovery efficency of an oil-wet rock could be improved by natural adsorption of water if the rock wettability was changed.Therefore it was of great significance for improving oil recovery by understanding the influential factors of wettability changes.Core flooding experiment indicates that neutral wettability core has the highest recovery of 45.26%.followed by strong water wet core with the recovery of 35.96%,the strong oil-wet core has the lowest recovery of 32.61%.The wettability is changed from oil wet to water wet,the oil-water permeability curve is turned to right,the remaining oil saturation decreases 25% with obvious enlargement of water-oil complex permeability zone,the recovery percent is evidently improved.Injecting surfactant to change the reservoir wettability is a more feasible way to enhance oil recovery.

关 键 词：润湿性改变 采收率 表面活性剂 低渗透油气藏 

分 类 号：TE357[石油与天然气工程—油气田开发工程]