Optimization of Sand Washing Nozzle Performance in a Novel Sand Removal Device Based on Taguchi Method and CFD
Due to the later stage of production in many oil and gas wells within the Tuha oilfield,sand production has emerged as a prominent factor impacting output.To enhance the efficiency of mid-to-late stage wells and mitigate reservoir sand burial risks and achieve cost reduction and efficiency increase,a novel sand removal device was proposed.After fully analyzing the working principle of the device,it was found that this device could effectively impact and remove sand particles or layers at the well bottom.Because the structure and specific dimensions of the sand washing nozzle significantly influence overall performance(sand washing depth)of the device,an optimization approach combining Taguchi method and computational fluid dynamics(CFD)was employed.Sand washing depth was defined as experimental indicator,the outlet diameter,length-to-diameter ratio of outlet cylindrical section and nozzle con-traction angle were defined as control factors,the group experiments were conducted respectively.The results were subsequently analyzed using signal-to-noise ratio analysis method and variance analysis method.The results show that optimal performance for this sand wash-ing nozzle is achieved when utilizing an outlet diameter of 8 mm,inlet diameter of 16 mm,contraction angle of 15°,length of outlet cy-lindrical section at 20 mm,and length of inlet cylindrical section at 32 mm,farthest sand washing depth can reach 0.594 m.Compared with the nozzle before optimization,the optimized nozzle sand washing ability is improved by 31.3％.
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