Washburn高度法对新型双季铵盐复配改性膨润土的润湿性研究  

The Washburn Height Rise Method Used to Study the Wettability of Bentonite Modified by New Type Compounded Bis-Quaternary Ammonium Salts

作　　者：胡昭朝 高芒来[1] 谷峥 罗忠新 薛广海 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室理学院,北京102249

出　　处：《高校化学工程学报》2013年第4期669-675,共7页Journal of Chemical Engineering of Chinese Universities

摘　　要：Washburn方程是研究粉体对液体润湿性的有效工具,但实际使用存在一定的局限性。今对Washburn方程进行了变换,并通过六甲基乙二铵二甲硫酸盐(EDAS)与六甲基己二铵二甲硫酸盐(HDAS)复配改性膨润土对水和正庚烷的润湿性验证了变换Washburn方程的可靠性,并比较了不同改性浓度及复配比例对膨润土润湿性的影响。结果表明,与钠土相比,改性膨润土对水的润湿性均有较大程度的增强,而对正庚烷的润湿性均有一定程度的减弱。50%复配比例下改性先后顺序对膨润土的水润湿性影响较小,25%HDAS和75%HDAS改性膨润土的水润湿性均较其他复配比例强。1.5CEC,25%HDAS的油水相对润湿系数β值最大,该条件下改性剂可使强亲油岩石润湿性发生改变。Washburn’s equation is a useful tool for studying the wettability of powder,but it has certain limitation in practice.In this paper,Washburn’s equation was transformed and its reliability was identified through the water and n-heptane wettability of bentonite modified by hexamethyl ethyl diammonium methylsulfate（EDAS） mixed with hexamethyl hexyl diammonium methylsulfate（HDAS）.In addition,the effects of different concentrations and component ratios of the modifier on the wettability of modified bentonite were compared.The results show that the water wettability of modified bentonite is stronger than that of sodium bentonite,while the n-heptane wettability of modified bentonite is weaker.Meanwhile,the order of modifying has little effect on the water wettability of 50% HDAS,and the water wettability of bentonite modified with 25% HDAS and 75% HDAS are stronger than that of bentonite modified with any other component ratios.The oil water relative wettability coefficient β reaches its highest value when bentonite modified with 25% HDAS at 1.5 CEC,which indicates that the wettability of strong oil-wet rock can be converted by bentonite modified with such condition.

关 键 词：Washburn方程 双季铵盐 复配 改性膨润土 润湿性 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]