含蜡原油乳状液磁处理降黏实验  

Experiment on viscosity reduction of waxy crude oil emulsion by magnetic treatment

作　　者：柴冲 侯磊[2] 李雪莹 贺思宸 黄亚楠 CHAI Chong;HOU Lei;LI Xueying;HE Sichen;HUANG Yanan(PipeChina Institute of Science and Technology;Collge of Mechanical and Transportation Engineering,China University of Petroleum(Beijing//MOE Key Laboratory of Petroleum Engineering))

机构地区：[1]国家管网集团科学技术研究总院分公司,河北省廊坊市065000 [2]中国石油大学(北京)机械与储运工程学院·石油工程教育部重点实验室,北京市102249

出　　处：《油气储运》2023年第1期87-95,共9页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金面上项目“磁场作用下含蜡原油乳状液黏度变化机理的多尺度表征研究”,51974335。

摘　　要：油田集输工艺中油水混合物形成的原油乳状液流变特性较为复杂,可能影响管道安全经济运行。为探究磁处理对含蜡原油乳状液的降黏效果,利用自行研制的静态永磁处理装置,调整磁场强度、磁处理温度及磁处理时间,对乳状液的黏度变化进行实验研究。对磁处理前后原油乳状液黏度与油水界面张力进行测量,观察乳状液液滴分布情况,分析乳状液降黏原因。通过磁处理实验发现,当磁处理温度为58℃、磁场强度为200 T、磁处理10 min时,乳状液黏度降低幅度最大,降黏率达到14.5%;通过界面与显微实验发现,乳状液经磁处理后油水界面张力降低,施加不同的磁处理条件后液滴分布不变,磁场作用通过降低油水界面张力与原油黏度进而降低乳状液黏度。研究成果可为含蜡原油乳状液降黏输送技术提供指导,保障原油集输安全。(图10,表4,参26)The crude oil emulsion formed by oil-water mixture in the process of oilfield gathering and transportation has complicated rheological properties, which may affect the safe and economic operation of pipelines. In order to explore the viscosity reduction effect of magnetic treatment on waxy crude oil emulsion, the viscosity change of emulsion was experimentally studied by adjusting the magnetic field intensity, as well as the temperature and time of magnetic treatment, with the self-developed static permanent magnet treatment device.Then, the crude oil viscosity and oil-water interfacial tension before and after magnetic treatment were measured, the droplet distribution of emulsion was observed, and the reason for emulsion viscosity reduction was analyzed. Through the magnetic treatment experiment, it is found that the viscosity reduction rate of the emulsion is the highest(14.5%) when the magnetic treatment lasts 10 min at the magnetic treatment temperature of 58 ℃ and the magnetic field intensity of 200 mT. It is also found through the interface and microscopic experiment that the oil-water interfacial tension of the emulsion decreases after magnetic treatment, the droplet distribution remains unchanged after the application of different magnetic treatment conditions, and the viscosity of emulsion is reduced under the action of magnetic field that decreases the oil-water interfacial tension and crude oil viscosity. Generally, the research results could provide guidance for the viscosity reduction and transportation technology of waxy crude oil emulsion, thus ensuring the safe gathering of crude oil.(10 Figures, 4 Tables, 26 References)

关 键 词：油田集输 含蜡原油 乳状液 磁处理 界面张力 液滴分布 降黏率 

分 类 号：TE81[石油与天然气工程—油气储运工程]