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以实验方法研究了地层水中Na~+和Ca~2+等无机阳离子与油基泥浆的协同作用对油藏岩石润湿性的影响。研究结果表明,离子浓度的增加使砂岩孔隙表面的水湿性减弱或油湿性增强,在相同浓度下多价离子的影响大大超过单价离子的影响。并且发现这种影响主要发生在无机离子与阴离子型表面活性剂共存的体系中,无机离子通过改变界面电性使水膜稳定性减弱,从而导致活性剂在固体表面的吸附量增加并改变其离子的排列方向。无机离子对阳离子烈表面活性剂的润湿作用影响较小。
The influence of the synergistic effect between inorganic cations such as Na ~ + and Ca ~ 2 + in formation water on oil rock wettability was studied experimentally. The results show that the increase of ion concentration decreases the water wettability or oil wettability of sandstone pore surface, and the effect of polyvalent ions at the same concentration greatly exceeds that of monovalent ions. And found that this effect occurs mainly in the coexistence of inorganic ions and anionic surfactants in the system, inorganic ions by changing the electrical properties of the interface to make water film stability weakened, resulting in increased adsorption of active agent on the solid surface and change its ions The direction of the arrangement. Inorganic ions have little effect on the wetting action of cationic surfactant.