Structural optimization of mini-hydrocyclone for downhole oil-water separation based on response surface methodology
To address the problem of the significant impact of structural parameters on the separation performance of micro cyclones,a mathematical model for the relationship between the five main structural parameters of micro cyclones,including the diameter of the bottom flow port,and separation efficiency and pressure loss,was constructed using second-order polynomial basis functions based on numerical simulation methods and Box Behnken design.Numerical simulation and indoor experiments were conducted on the micro cyclones before and after optimization.The accuracy of the mathematical relationship model was verified through variance analysis of simulated data,and the contour plot clarified the interaction between structural parameters and the degree of impact on separation efficiency and pressure loss.The results indicate that the diameter of the bottom flow port,small cone angle,and overflow port diameter are important structural factors that affect the separation efficiency and pressure loss of the micro cyclone;The structural parameters of the optimized micro cyclone are L1=9.554 mm,Dd=2.184 mm,Do=2.977,θ=9.39°,θ2=2°,and the separation efficiency is increased by 3.7%compared to the initial structure.The research results can provide reference for the design of high-performance downhole oil-water separation micro cyclones.
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