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针对油田生产中含表面活性剂原油电脱水极为困难,缺乏理论指导的现状,采用动态微观实验的方法,研究含表面活性剂的油水系统中液滴在电场力作用下聚并排液的情况,计算液滴的聚结时间,并观测液滴发生形变直至破裂时各个阶段的现象。结果表明,表面活性剂可引起液滴界面排斥力上升,聚并过程中液面出现形变,降低液滴聚结速度。此外,液滴表面所吸附的表面活性剂分子会加剧液滴形变率,降低液滴破裂所需临界场强,并改变液滴破裂机制,增加了次级微小液滴的产生。须严格控制电场强度,以避免液滴变形破裂,提高聚结效率,确保电脱水的效果。
In view of the fact that it is very difficult and not theoretical to guide the dehydration of surfactant-containing crude oil in oilfield production, a dynamic microscopic experiment is used to study the situation that the liquid droplets in the surfactant-containing oil-water system converge and drain under the action of the electric field force. Droplet coalescence time, and observe the droplet deformation until rupture of the various stages of the phenomenon. The results show that the surfactant can cause the repulsion of the droplet interface to increase, and the liquid surface deforms during the process of aggregation, reducing the droplet coalescence rate. In addition, the surfactant molecules adsorbed on the droplet surface will aggravate the droplet deformation rate, reduce the critical field strength required for droplet breakage, and change the droplet breakage mechanism and increase the generation of secondary droplet. The electric field intensity must be strictly controlled to avoid deformation and rupture of the droplets, improve coalescence efficiency and ensure the effect of electric dehydration.