【摘要】 本文通过系统测试各种油基泥浆组分及两种纯表面活性剂对硅石-水和水-油界面Zeta电位的影响,发现界面电性改变是导致油藏岩石的润湿性由亲水向亲油方向转化的一个重要因素。润湿性改变的程度,与表面活性剂的类型有关。由于阳离子型表面活性剂在两种界面上的吸附,使位于岩石与油之间水膜的稳定性减弱,使溶于油中的表面活性物质容易直接吸附在硅石表面,造成原来是亲水的表面转变为亲油。而阴离子型表面活性剂的吸附,有利于水膜的稳定,由它所引起润湿性改变的程度要比阳离子型表面活性剂小得多。油基泥浆中的基础油,由于基本不含表面活性物质,对界面电性和润湿性的影响均较小。更多还原

【Abstract】 The systematic measurements have been conducted dealing with the effect of oil-based mud components and two pure surfactants on the zeta potential of silica-water and watr-oil interfaces. It has been found that the change in the electrical properties of interfaces is a major facror resulting in the wettability alterrion of reservoir rocks from water-wet to oil-wet conditions. The extent of the wettability alteration heavily depends on the types of surfactants. Since the absorption of cationic sutfactants at two kinds of interfaces reduces the stability of the thin water film between the rock and oil,the surfactants soluble in the oil phase might be easily absorbed onto the silica surface,leading to a great change in wettability. On the other hand, the absorption of anionic surfacrants tends to form a stable water film, therefore, the extent of the wettability alteration caused by cationic surfactants. The base oils have little effect on both electrical properties and the wettability of rocks because of the absence of any surfactants in these oils.更多还原