Research On Intensified Separation Mechanism And Technology Of Electric Dehydrator

In recent years,many oil fields in the world have entered a period of high water cut development,and the water content in the crude oil produced is as high as 80%.Moreover,in the middle and late stages of oil field exploitation,with the arrival of "tertiary oil recovery" and the use of a large amount of the liquid composition is complex,the liquid film is difficult to rupture,and dehydration becomes more and more difficult.Traditional electric dehydrators can no longer work efficiently.Therefore,it is important to optimize the structure of the traditional electric dehydrator and study the influence of different electric field parameters and operating parameters on the relative dehydration rate of the emulsion,so as to determine the optimal parameters for enhancing the separation of the electric dehydrator.Based on the above background,this article focuses on macroscopic experiments,supplemented by numerical simulations,and comprehensively considers the parameters of electric field strength,frequency,water content,emulsion stability,electric field action time,and polymer concentration to study the dehydration of the emulsion.Clarified the law of influence of different factors.The influence of the inlet pipe and electrode plate on the separation effect of the electric dehydrator is analyzed,and the relationship between the electric field and flow field distribution and the separation effect of the electric dehydrator is clarified,and the optimal parameters suitable for the dehydration of different emulsions are obtained.A structural design scheme for improving the quality and efficiency of the electric dehydrator is presented.The main research contents and conclusions of this paper are as follows:A small sample tank experimental system was designed,and the emulsion was prepared with oils of different properties,and the water content of the emulsion before and after powerup was calculated by distillation,so as to calculate the relative dehydration rate.The influence rules and mechanisms of electric field parameters such as electric field intensity and waveform at different frequencies,as well as operating parameters such as polymer concentration,electric field action time,water content,and emulsion stability,on the efficiency of emulsion dehydration are clarified.Different emulsions have different optimal dehydration electric fields,and the higher the frequency,the lower the required dehydration field strength.For heavy oil,high-water emulsions and polymer aqueous solutions,ordinary power frequency electric fields are prone to tripping,while ultra-high frequency electric fields can be applied to emulsions of different properties.Observation of the microscopic droplets of the emulsion after the action of the electric field reveals the advantages of ultra-high frequency dehydration.The flow field distribution in the dehydrator and the electric field distribution between the plates are studied,and the Fluent and COMSOL Multiphysics simulation software are used for simulation.By calculating the uneven coefficient of the mass flow distribution at the outlet of each liquid distribution pipe,the streamline diagram in the pipe is analyzed.With the velocity cloud diagram of each outlet,and the field strength and electric field distribution between the plates,the relationship between the different structures and the separation effect of the electric dehydrator is obtained.The liquid distribution between the electrode plates is prone to eddy currents and uneven flow distribution.The dehydration field strength between the horizontal circular hole electrode plates is the largest,followed by the vertical fence horizontal electrode and the horizontal fence horizontal electrode,and the horizontal long hole electrode plate and the horizontal long-hole electrode plate has the smallest dehydration field strength.A set of electric dehydrator was manufactured according to the structure design after simulation optimization.The dehydration effect of the device under the action of the ultra-high frequency adaptive dehydration power supply was investigated,and the dehydration performance of the device was tested.Combining the conclusions of theory and small sample tank experiment,the emulsion dehydration under the action of ultra-high frequency was studied,and the influence of electric field parameters on the dynamic dehydration of emulsion under different water content and power-on time was clarified.UHF transformer C is a kind of selfadaptive power-off equipment.During the dehydration process,the transformer always maintains a "self-optimizing" working state,and will adjust itself according to the type,nature and separation of the emulsion.The best electric field parameters ensure that the emulsion has minimal energy consumption under the condition of high-efficiency dehydration.After the experiment is completed,the water content of the oil outlet distillation measurement is less than0.5%,and the test prototype meets the requirements.The results show that power frequency transformers are only suitable for ordinary crude oil emulsions with low water content.For high water content emulsions,heavy oil emulsions and polyaddition aqueous solutions,high-frequency transformers and ultra-high frequency adaptive transformers need to be considered.Due to its low energy consumption,high efficiency and stable work characteristics,dehydration is more advantageous.