大庆外围油田润湿性研究  

Study on reservoir wettability in Daqing periphery oilfield

作　　者：毛伟[1] 余碧君[1] 侯小玲[1] 

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《石油地质与工程》2007年第5期90-92,共3页Petroleum Geology and Engineering

摘　　要：润湿性影响着油水在岩石孔道中的微观分布,决定着毛管压力的大小和方向,因而是油田注水开发中的一项重要参数。对大庆外围油田润湿性进行了研究,润湿性以亲水为主。分析了大庆外围油田润湿性影响因素,随原油中非烃、沥青质含量的增加,亲水性逐渐减弱;随地层水矿化度、束缚水饱和度的增加,亲水性逐渐增强。为了对油层的润湿性有更形象直观的了解,建立了润湿指数和接触角之间的数学模型,该模型可确定油藏的平均接触角,可将依据润湿指数判断润湿性的方法转为依据接触角判断润湿性的方法,可实现压汞法毛管压力曲线和油层条件下油水毛管压力曲线的准确转换,从而为储层微观孔隙结构研究、相对渗透率预测、油藏数值模拟计算提供可靠的数据支持。Wettability is an important parameter in water flood- ing development,because it determines oil-water micro -distribution and capillary and its direction in rock pore and throat.Wettability in Daqing periphery oilfield is studied in this paper and the wettability mainly appears as hydrophilicity.The analysis of the influencing factors of wettability in Daqing periphery oilfield shows that hydro- philicity decreases as non-hydrocarbon and asphaltene increases;while hydrophilicity increases as water salinity and irreducible water saturation increases.In order to have a better understanding of wettability,a mathematical model between wettability index and angle of contact is established.This model can be used to determine the av- erage angle of contact,reahze accurate transformation be- tween capillary curve based on mercury and oil-water capillary curve under the condition of reservoir,and pro- vide reliable support for pore structure,relative permea- bility prediction and reservoir numerical simulation.

关 键 词：润湿性 影响因素 润湿指数 接触角 毛管压力 

分 类 号：TE311[石油与天然气工程—油气田开发工程]