| The nature of well produced fluid becomes increasingly complex, with many oil fields gradually entering high water cut stage, especially the wide range of applications of the secondary oil recovery and enhanced oil recovery technology. The difficulty of crude oil dehydration is growing, and conventional thermal chemical and electrochemical dehydration technology can not meet the needs of production of crude oil dehydration. We hope to develop energy-saving technologies, which can meet the requirements of dehydration of the complex oil produced fluid. Ultrasonic dehydration is a new type of crude oil dehydration technology, which is proposed in this situation.A set of visual equipment for observing water droplets'behaviors is constructed in the paper, and we obtain the motion pictures of water droplets with the action of ultrasound by high-speed camera. Water droplets'behaviors are studied in the paper, such as movement, collision, aggregate, emulsion and division. Analysis of the relationship between the rate of water droplets'coalescence and sound pressure is made, so we can recognize the effect of ultrasound on the dehydration intuitively.Under the static experimental conditions, we get the best ranges of factors through studying the effect of water content, temperature, treating time, sound pressure, ultrasound frequency, settling time and demulsifier on the dehydration. The results show that ultrasound can greatly enhance the effect of thermal chemical dehydration, and the higher water content, the better the effect of dehydration.We simulate the process of on-site dewatering of the oil field and have designed a set of small dynamic experiment device on the basis of the static experiment. We study the effect of sound pressure, temperature, treating time, settling time and velocity of flow on the dehydration by orthogonal experiment, and get the best dehydration parameters, which provide guiding significance for the practical application of ultrasonic dehydration technology.
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