在这项研究中,构建了平板陶瓷膜实验装置,研究了油田采出水膜污染界面的热力学。测量了陶瓷膜在三种模型溶液中的通量随时间的变化,以及表面张力,固体的接触角和Zeta电位。结合XDLVO理论探讨了三种模型解的膜污染界面的热力学机理。对陶瓷板膜界面的热力学研究表明,在膜污染初期,膜与油滴之间的总相互作用能随着两个界面之间距离的增加而减小。最终从相互吸引转变为相互排斥。储层与油滴之间的总相互作用能表现为相互吸引。总相互作用能随储层与油滴界面距离的增加而减小。原油的Zeta电位在一定程度上受到盐度的影响。盐离子的静电屏蔽作用导致三种溶液的ζ电位降低。它们的顺序是:模型解A>模型解B>模型解C。这导致静电相互作用(EL)的减少。由于油层与油滴具有相同的成分,三种溶液中的EL相互作用可以表现为相互排斥。
In this
study, a flat sheet ceramic membrane experimental device was constructed, and the thermodynamics of membrane fouling interface was studied for oilfield produced water. The flux of ceramic membrane in three kinds of model solutions were measured with time, as well as the surface tension, contact Angle and Zeta potential of solid. The thermodynamic mechanism of membrane fouling interface combined with
XDLVO theory were explored for three kinds of model solutions. The thermodynamic
study of the interface of ceramic plate membrane shows that the total interaction energy between membrane and oil droplets decreases with the increase of the distance between two interfaces at initial stage of membrane fouling, and finally transforms from the mutual attraction to the mutual repulsion. The total interaction energy between reservoir and oil droplet is shown as mutual attraction, and the total interaction energy decreases with the increase of the distance between reservoir and oil droplet interface. The zeta potential of crude oil was affected by salinity to some extent. The electrostatic shielding effect of the salt ions leads to a decrease in the ζ-potential of the three solutions. They are in the order: model solution A > model solution B > model solution C. This leads to a decrease in the electrostatic interaction (EL). And since the oil layer has the same composition as the oil droplets, the EL interactions in the three solutions can behave as mutual repulsion.