Abstract: An experimental study on the viscosity-temperature characteristics and phase inversion process in aging oil emulsion was carried out. By using the static crude oil electrostatic coalesce experimental device, the effect of phase inversion on electrostatic coalescence and dehydration was examined. The effects of electric field intensity and frequency on dehydration were also studied in the case of aging oil emulsion ware passing through the high frequency and voltage electric field by using a specific electrostatic coalesce experimental device. The results showed that the water content at the phase inversion point was about 40%, the viscosity of aging oil emulsion increased obviously during phase inversion process, which hindered the dehydration. The dehydration efficiency was up to 97.8% under the optimal conditions of electric field intensity 1.25 kV/cm and frequency 2.5 kHz when the water content was 30%, the dehydration efficiency was only 4.2% under the same electric field parameters except 50 Hz frequency. High frequency electric field was more effective than regular electric field.

Key words: aging oil, water-in-crude oil emulsion, emulsion phase inversion, high frequency and voltage electric field, demulsification, centrifugal dehydration

摘要： 在测定老化油乳化液粘度-温度曲线、含水率反相点曲线的基础上，采用静态静电聚结破乳实验装置研究了油水反相特性对电场破乳脱水效果的影响，使用自主搭建的动态破乳脱水特性快速评价装置研究了高频/高压脉冲交流电场下电场强度和频率对老化油乳化液破乳脱水效果的影响. 结果表明，流花油田老化油反相点含水率约为40%，油水反相过程中乳化液粘度增加，电场破乳脱水难度增大；老化油乳化液含水率为30%时，最优电场强度1.25 kV/cm、电场频率2.5 kHz下破乳后的离心脱水率为97.8%，远高于工频电场下的离心脱水率(4.2%)，高频/高压电场破乳比工频/高压电场破乳优势明显.

关键词: 老化油, W/O型原油乳化液, 乳化液反相, 高频/高压脉冲交流电场, 电场破乳, 离心脱水