The splitter packer is the most important tool in the sand scraping and flushing technology,which directly affects the efficiency of sand flushing and well washing.In view of the problem that the cups of the splitter packer is prone to tearing and wear,the study on the mechanical characteristics of the cups was carried out.Using a combination of finite element method and experiments,the effects of the outer and bottom diameters of the push cylinder,the horizontal distance and inner and outer diameters of the cup on the sealing performance of the splitter packer were studied,and the structural parameters of the cup assembly were optimized.The results show that the main factors affecting the cup seal are the outer diameter,inner diameter,horizontal distance of the cup,bottom diameter and outer diameter of the push cylinder in order.The optimal structural parameters are 192 mm outer diameter of the push cylinder,188 mm bottom diameter,185 mm inner diameter of the cup,216 mm outer diameter and 46 mm horizontal distance.The test results show that the optimized cup meets the using requirements of 244.5 mm casing,and the static seal pressure of 20 MPa and dynamic seal pressure of 10 MPa.The overall performance is improved and the accuracy of finite element simulation analysis is verified.The results of the study can provide reference for the overall performance improvement and application of the splitter packer.