Dehydration Characteristics And Mechanism Of Crude Oil Emulsion Under Combined Action Of Electric Field And Magnetic Field

Crude oil dehydration is an important link in the industrial production of oilfield.With the oilfield gradually entering the stage of high water cut exploitation,single electric field can not meet the requirements of crude oil production site for dehydration.In order to explore more effective dehydration methods,this paper carried out the research on dehydration characteristics and dehydration mechanism of crude oil emulsion under the combined action of electric field and magnetic field,In order to improve the existing crude oil electric dehydration technology and provide guidance for crude oil production.In this paper,through the construction of crude oil dehydration platform to carry out crude oil electric dehydration experiment,the dehydration characteristics of oil-water emulsion under the combined action of electric field and magnetic field were studied.Finally,through the establishment of the force model of water droplets under the combined field,the influence law of the movement and deformation of water droplets in the emulsion is analyzed,and the dehydration mechanism of crude oil emulsion under the combined field is explored.The results show that the dehydration rate of emulsion under the combined action of AC square wave electric field and magnetic field is better than that under the action of single electric field.When the water content is low,the dehydration efficiency of emulsion can be improved by appropriately prolonging the action time of combined field;Under the combined action of DC electric field and magnetic field,the movement direction of water drops is related to the direction of electric field and magnetic field.When the direction of Lorentz force on charged water drops is consistent with the direction of water drop settlement,it can accelerate the water drop settlement speed and improve the dehydration efficiency.Through the orthogonal experimental analysis of electric field,magnetic field and physical property parameters of water drop,the influencing factors of electric dehydration experiment were determined,and the order of influencing factors on dehydration rate and the optimal combination relationship among various factors were obtained.Finally,the multiple linear regression model is established,and the empirical formula between the dehydration rate of emulsion under the combined action of electric field and magnetic field and the factors in the experiment is obtained and verified.Combined with the force model of water drop under the combined action of electric field and magnetic field,the expressions of vibration amplitude and motion displacement of water drop under the combined action of AC square wave electric field and magnetic field are obtained,and the mathematical expressions of motion velocity of charged water drop under the combined action of DC electric field and magnetic field are obtained,so as to determine the electric field strength,electric field frequency,magnetic induction strength,electric field frequency,electric field frequency,electric field frequency,electric field frequency,electric field frequency,electric field frequency,electric field frequency,electric field frequency,electric field frequency The influence of droplet radius and emulsion viscosity on droplet motion was studied.The research results of this paper can provide a reference for the selection of crude oil dehydration parameters under the combined action of electric field and magnetic field,provide a basis for the development of efficient dehydration technology,and lay a foundation for the research of new dehydration technology and dehydration mechanism.