Optimizing The Electrode Form Of High Frequency Pulse Electrocoalescer

With the development of domestic oil field,the nature of crude oil is becoming more and more complex,and the difficulty of demulsification and pre-dehydration of crude oil production fluid is greatly increased,which puts forward higher requirements for the effect of crude oil dehydration equipment.However,the existing electric dehydration equipment has a single plate type,which has a poor demulsification effect for complex emulsions.Based on this,this paper uses self-designed electric dehydration coalescing device,changes the electric field parameters and plate geometry structure and layout,and studies the influence of plate type in high frequency and high voltage electric coalescer on the effect of electric dehydration.In this paper,both the method of simulation and experiment are used for research.The electric field distribution is created and analyzed using COMSOL Multiphysics software.Under the simulated conditions,the electric field distribution formed by several different plate geometry structures is non-uniform.The dielectrophoretic force distribution is more obvious under the plate with folded Angle or tip of the geometrical structure,which is conducive to the directional movement of droplets and the migration and coalescence process.For the droplet motion under non-uniform electric field,the droplet tends to move from low field intensity gradient to high field intensity gradient.QC320 # conducting oil is used as the continuous phase.Deionized water is used as the dispersed phase.Water-in-oil emulsion with a moisture content of 10%.The effects of different electric field parameters on droplet coalescence of high frequency and high voltage coalescence are studied.The experimental results showed that: increasing the voltage amplitude and pulse width ratio would greatly improve the electric dehydration efficiency,and the influence of frequency parameters was small;over-high voltage amplitude will cause short circuit of pole plate,electric field instability and high energy consumption.Secondly,experiments are carried out with different geometric plates to study the effect of different plate structure characteristics on dehydration process.The results show that the electric field generated by the newly designed electrodes can enhance dehydration process by optimizing the electric field distribution and electric coalescence behavior.The results show that the electric fields created by our proposed electrodes can aid the dehydration process by optimizing the electric field distribution and the electropolymerization behaviors.Furthermore,the results indicate that the non-uniform fields formed by the proposed electrodes can lead to acceleration in the movement of water droplets as well as a facilitated sedimentation stage.The appropriate tilt Angle of flat electrode can enhance the process of electric dehydration,but the excessive tilt Angle will decrease the efficiency of electric dehydration.Water film formed by copper net electrode can induce the bonding of water drop interface.A water film created by a copper mesh electrode can induce a droplet–interface coalescence.The geometry of a grid electrode can promote a two-phase oil and water movement,and the geometry of a grid electrode can promote a two-phase oil and water movement.These results could provide insights for the future design of the best electrode geometry for efficient electrocoalescence.