Study on the velocity of oil droplet motion and aggregation law under the action of the gravitational field
Due to the decline of production in the middle and late stages of oil wells,water injection development technology is widely used.In order to optimize the water quality of injection water and purify the formation,it is necessary to improve the oil-water separation efficiency in the extracted water.The efficiency of oil-water separation depends on the mastery of oil-water two-phase motion law and the correct application of separation methods.In this study,based on the theory of oil droplet motion,the deformation and aggregation dynamics of oil droplets in the flow field are finely described with the help of Fluent finite element simulation software.The rising velocity of oil droplets with viscosities of 5.7 mPa·s and 54 mPa·s and diameters of 3.0 mm to 8.5 mm in the gravitational field and their deformation laws were tested experimentally.The results show that oil droplets with larger diameters have larger acceleration and reach the maximum velocity in advance,and their deformation coefficients in the uplifting process gradually increase with the increase of oil phase viscosity.The aggregation of multiple oil droplets and their velocities are mainly influenced by the viscosity change of continuous phase.On the basis of the original oil droplet velocity calculation model,the influence of surface tension on the deformation of oil droplets is considered,and the error of velocity calculation of oil droplets is±7%in the new model obtained,which significantly improves the calculation accuracy of oil droplet velocity.
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