注水开发对原油性质的影响规律研究  

RESEARCH ON THE INFLUENCE OF WATER FLOODING DEVELOPMENT ON CRUDE OIL PROPERTIES

作　　者：史长林[1] 纪友亮[1] 李清山[1] 谭振华[2] 

机构地区：[1]中国石油大学地球科学学院,北京昌平102249 [2]中国石油大港油田公司,天津大港300280

出　　处：《西南石油大学学报（自然科学版）》2010年第3期112-116,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家科技重大专项课题(2008ZX05009-003)

摘　　要：砂岩油藏长期注水开发,注入水对储层孔隙中的原油物性有较大影响,主要表现为:随着注水开发时间的延长,原油密度、黏度、含蜡量、凝固点逐渐增大;原油黏度的变化表现出一定的阶段性,含水率在20%以下,原油黏度上升幅度较大,含水率为20%～85%时,原油黏度上升幅度比较平稳,含水率90%以上时,原油黏度上升幅度又变大;不同地区、不同层位原油性质变化特征具有明显差异;水洗前后原油性质参数之间的关系也发生变化,水洗后相同密度原油所对应的黏度明显增加,相同密度、黏度的原油所对应的凝固点明显升高。原油性质变化机理研究表明:油藏温度变化、原油轻质组分分离、脱气和注水水质是引起原油性质变化的主要原因。In water flooding sandstone reservoir,injected water has large impact on crude oil properties.The density,viscosity,wax content and freezing point of crude oil gradually increase along with the time of water flooding development.The change of crude oil viscosity shows the feature in stages that the viscosity increases sharply before the stage of 20% water cut,and increases smoothly in the stage of 20% to 85% water cut,then increases rapidly after the stage of 90% water cut.The change of crude oil properties is different in different areas or layers.The relationship among crude oil properties also changes before or after water breakthrough.After water breakthrough,the viscosity of oil with the same density is larger than before,and the freezing point of oil with the same density or viscosity becomes higher than before.This study on the change mechanism of crude oil properties shows that the change of reservoir temperature,separation of light component from crude oil,degassing and injected water quality are the primary causes of the change of crude oil properties.

关 键 词：注水开发 原油性质 含水率 注水水质 油藏温度 

分 类 号：TE341[石油与天然气工程—油气田开发工程]