胜利原油与水的界面张力研究

STUDY ON INTERFACIAL TENSION BETWEEN SHENGLI CRUDE OIL AND WATER

采用滴体积法测定了胜利原油与水的界面张力 ,用界面移动法测定了原油油滴在水中的电迁移率。并考察了水相盐浓度、pH值对油水界面张力及油滴电迁移率的影响。研究结果表明 ,原油 水的界面张力先是随水相中NaCl浓度的增大而减小 ,而后随水相中NaCl浓度的增大而增大 ,水相中NaCl的浓度为 2 %时 ,油水界面张力出现最小值。相应地 ,油滴在水中的电迁移率则是先增大后减小 ,在NaCl浓度为 2 %时达到最大值。在水相 pH值为 2～ 12时 ,原油水界面张力随pH值的变化规律是先增大后减小 ,在pH值为 4时达到最大值 ,而油滴在水中的电迁移率却随

The interfacial tension between Shengli crude oil and water was measured. The effect of brine and pH value on interfacial tension was studied with the drop volume method. The interfacial tension gets a minimum value, and the electrophoretic mobility goes through a maximum value with the increasing of salt concentration in aqueous phase. The interfacial tension and electrophoretic mobility reach the minimum and maximum values respectively when the salt concentration in water is about 2%. When the pH values are within 2～12, the interfacial tension first increases and then decreases with the increasing of pH values of aqueous phase, and it goes up to a maximum when pH value is about 4.