Mechanical Analysis And Structural 0ptimization Of The Shaping Necking Sleeve Of The Hydraulic Ball Shaper

Compared with the traditional shaping technology,rolling shaping technology is a safe and efficient casing shaping technology.This technology has less damage to the casing and a large amount of single shaping.In the vertical well,deep well section and horizontal well section where casing deformation and damage accidents often occur,this technology can fully show its workover ability.As the main application tool of rolling shaping technology,the rationality of its structure has a direct impact on the shaping efficiency of rolling shaping technology.Therefore,this study focuses on the mechanical analysis and structural optimization of the shaping necking sleeve of the hydraulic ball shaper.Based on the actual structure of the hydraulic ball shaper,the three-dimensional double nonlinear finite element model of the rolling shaping reducing sleeve of the shaper body with multi-stage balls was established by using the finite element analysis method,and the mechanical analysis was carried out.In this paper,four grid generation methods were selected to analyze the rationality of grid generation.The final analysis determines that when the axial and circumferential lengths of the casing element are 20 mm and the meshing scheme is the most efficient and reasonable.The results show that when the axial displacement of the shaper is 193 mm,the casing reaches the strength limit and the residual stress of the casing is 781.01 Mpa.The large residual stress weakens the ability of the casing to bear external load after shaping.Considering the spiral motion state of the shaper in the rolling process,the motion process of the single-stage ball in the casing was analyzed in this paper.Finally,the loading condition of the shaper is that when the shaft speed is 1 mm / s,the speed should not be less than 0.12 rad/s.Then,five sets of shaft speed parameters and rotational speed parameters were set respectively,and the influence of two construction parameters on the rolling shaping of reduced diameter deformed casing was studied.The research shows that although the increase of shaft speed has little influence on the diameter expansion of casing,it will make it easier for the casing to reach the strength limit in advance in the shaping process,resulting in damage.The increase of rotating speed will not only make the inner wall of the casing rolled more evenly,but also increase the diameter expansion of the casing.However,it has little influence on the residual stress of casing.The research shows that when the shaft speed is 1mm / s and the speed is 0.48 rad/s,the best construction parameters are determined.In this paper,the parameters of the shaper structure were correlated and the total length,pitch and ball radius were determined as the optimal design variables.By analyzing the geometric relationship of each parameter,the value range of each design variable was obtained and the structural optimization mathematical model of hydraulic ball shaper was established.Using the experimental design method of optimal space filling,30 groups of sample points were generated and calculated.The Kriging response surface model was established by using the sample point data and the response surface model was verified.The response surface model was optimized by genetic algorithm and the shaping data of the optimized shaper structure was compared with the original model data.The results show that the diameter expansion of casing increases by 24.3%.The research results have certain guiding significance for the construction of rolling shaping site.