Experimental Study On Pulse Demulsification

The water content of crude oil is one of the common problems in the oilfield production.From oil production,refining,transportation to storage,all will lead to a series of problems,such as: increasing the difficulty and cost of mining equipment,pipeline corrosion fouling,refining accidents etc.Therefore,it's imperative to study demulsification of oil emulsion.The high voltage pulse electric field can effectively prevent the formation of water chain,make the demulsification effect significantly,make small energy consumption,but the effect of optimization of high voltage pulsed electric field operating conditions and parameters on demulsification performance to further system.In this paper,the influence law of each parameter is studied from two aspects.The experiment mainly explores the effects of different pulsed electric field strength(83.33KV/m,91.67KV/m,100KV/m,108.33KV/m and 116.67KV/m)to change the frequency range(1~4kHz)and other parameters of crude oil,the main conclusions are as follows:(1)field strength increases,the disperse phase coalescence force increases,deformation increases,easy coalescence,good demulsification effect,but the electric force drops too big to make the emulsion dispersion phase in coagulation before the tensile fracture formation of two small droplets,resulting in lower breaking rate;(2)with the increase of frequency,the demulsification rate increases first and then decreases,and there is an optimal value.The best demulsification frequency exists in the frequency range,and the optimal frequency is about 3KHz;(3)the experimental parameters such as temperature,processing time and duty cycle have different effects on demulsification.Finally,the COMSOL software was used to simulate the deformation coalescence process of the dispersed phase.