老化油乳化液在高频/高压脉冲交流电场下的破乳脱水实验研究

基于中海油深圳分公司流花11-1油田老化油配制的W/O型乳化液，采用静态静电聚结破乳实验，并辅助以离心机强化脱水，针对高频/高压脉冲AC电场下电场强度、频率、电压波形、含水率等因素对老化油乳化液电场破乳脱水效果的影响进行研究。结果表明：老化油乳化液的反相点位于40%~50%之间，W/O型老化油乳化液破乳脱水的最优电场参数为电压6 kV、频率2 kHz、波形为矩形波；以含水率40%较稳定老化油乳化液为例，其脱水率可达74.074%；改变乳化液含水率，最优电场破乳参数不变。上述研究结果为流花油田老化油处理流程的改造提供设计参考，并可为生产运行参数的改进提供依据。

DEMULSIFICATION AND DEHYDRATION OF AGING OIL EMULSION UNDER HIGH FREQUENCY AND HIGH VOLTAGE PULSED ELECTRIC FIELD

In this paper, based on the prepared aging oil W/O emulsion from Liuhua 11-1 oilfield, the influence of electric field intensity, frequency, waveform and moisture content on electric demulsification and dehydration under high frequency and high voltage electric field was investigated. A static electrostatic coalescing device with a centrifuge assisted to enhance the dehydration rate. The experiment results indicated that the phase inversion point of aging oil emulsion is between 40% and 50%, the optimal electric field parameter for W/O emulsion demulsification and dehydration is field strength (voltage) of 6 kV, frequency 2 kHz and AC square wave. The dehydration efficiency of stable W/O emulsion is 74.074% when the moisture content reaches 40%. These optimal electric field parameters do not vary with moisture content. This study can provide design references for the modification of aging oil treatment process in Liuhua oil field and a foundation for the improvement of production.