Abstract: The acidizing cleanup emulsion phenomenon is serious, and it can not enter the power off process. In view of the above problems, indoor simulation experiments were carried out to explore the influence of temperature, pH value, moisture content, the oil phase of the returned liquid, the water phase of the returned liquid, the iron-containing compound and the mud content on electric dehydration of returned acidizing fluids. It was found that when the impurities in the oil were less, the water phase and water content of the returned acidizing fluids had little effect on the electric dehydration, the increasing of the temperature was beneficial to the effluent demulsification, and neutral pH value was the most suitable condition for the demulsification of the returned fluids. The ferric hydroxide colloid which was wrapped with crude oil, sludge and free water in oil, forming a very high conductivity intermediate layer between the oil phase and the water phase, was the main cause of electric dehydrator trip.

Key words: Acidification, Returned fluid, Electric dehydration, Demulsification

摘要： 针对油井酸化后返排液乳化现象严重,无法进入电脱流程的问题,通过室内模拟实验从温度、pH、含水率、返排液油相、返排液水相、油中泥质、含铁化合物等方面进行了探究,发现当乳化不严重时返排液水相和含水率对电脱影响不大,温度升高有利于返排液破乳,pH 处于中性时最适合返排液破乳,而氢氧化铁胶体包裹着原油、油中污泥和游离水,形成了处于油水两相之间的电导率极高的中间层,是导致返排液过流的主要原因。

关键词: 酸化, 返排液, 电脱水, 氢氧化铁