Abstract:

The solidifying point of shale oil is high, and the wax content is high and the emulsification degree of shale oil is high. As a result, it is not easy to dehydrate shale oil emulations by using the traditional thermochemical method, which is difficult to meet the export standard. High frequency pulse dehydration technology is an effective method to dehydrate, but there are few studies on the optimization of treatment parameters of shale oil produced fluid. In this study, the effect of high frequency pulse dehydration technology on Dagang shale oil emulsion was studied, and the treatment parameters were optimized. The results show that high frequency pulse dehydration technology can achieve effective demulsification of shale oil produced liquid and significantly reduce the water content of shale oil. Through the comparison and selection of treatment parameters, it is found that the increase of electric field intensity and electric field frequency is conducive to improve the dehydration efficiency. Besides, there are electric field action time, operation temperature and demulsifier concentration parameters with the best dehydration efficiency. It is proposed that under the electric field strength of 200 kV/m, electric field frequency of 5 kHz, electric field action time of 60 min, operating temperature of 75 ℃, demulsifier mass fraction of 0.010%, the water content of shale oil after dehydration is 0.48%, and the comprehensive benefit is the best. The research results provide technical support for the optimization of shale oil produced fluid treatment parameters.

Key words: Shale oil, High frequency pulsed, Parameter optimization, Demulsifier, Water content

摘要：

页岩油具有凝点高、含蜡量高、乳化程度高的特点，导致传统热化学脱水工艺对页岩油采出液处理效果欠佳，难以达到外输标准。高频脉冲原油处理技术可以高效脱水，但对页岩油采出液处理参数的优化研究较少，因此研究了高频脉冲原油处理技术对大港页岩油采出液的处理效果，并对处理参数进行了优化。结果表明，高频脉冲脱水技术可以实现页岩油采出液有效破乳，显著降低页岩油含水率。通过处理参数的优化发现，电场强度和电场频率的提高均有利于提高脱水效率，同时，存在脱水效果最好的电场处理时间、操作温度以及破乳剂质量分数参数；在电场强度为200 kV/m、电场频率为5 kHz、电场处理时间为60 min、操作温度为75 ℃、破乳剂质量分数为0.010%的条件下，页岩油脱水后含水率为0.48%，综合效益最好。研究结果为页岩油采出液处理参数优选提供了技术支撑。

关键词: 页岩油, 高频脉冲, 参数优化, 破乳剂, 含水率