封隔器胶筒结构优化及优化方法比较

Structural Optimization of Packer Rubber and Optimization Method Comparison

以接触应力和胶筒体积作为优化目标,采用有限元方法对封隔器胶筒进行结构优化设计。首先对胶筒坐封过程进行分析,在此基础上分别以胶筒与套管的接触应力和胶筒的截面积为目标函数,采用不同的优化方法获得相应优化序列。以接触应力为优化目标时,优化后胶筒主要尺寸为长度65 mm,窄头宽度10 mm,肩部倾斜角45.12°,外径113 mm,胶筒与套管间的平均接触应力比优化前提高8.40%。以胶筒体积为优化目标时,优化后胶筒主要尺寸为长度65 mm,窄头宽度10 mm,肩部倾斜角47°,外径110 mm,胶筒体积比优化前减小17.39%。将不同优化方法所得结果对比可知,一阶优化法的精确度较高。

Taking contael stress and nlhber size as the nptimized objects, the finite element nlethod was used to conduct the optimized design of packer rubber strueture. First, the setting process （if packer ruhber was ana- hzed. on file hasis of this, the contact stress of rubber and easing, and the seetional area of ruhber were taken as the objective funetions respectively. The different optimization methods were used in order to obtain the correspond- ing oplimizatinn sequence. When the contact stress was taken as the optimized object, the main dimensions of rub- her after optinlizalion are as follows. The length is 65 mm, the narrow end width is 10 mm, the shoulder angle of in- clination is 45. 12°, and the external diameter is 113 mm. The average contact stress between rubber and casing in- creases by 8.40%, compared with that heft）re optimization. When the ruhber size was taken as the optimized ob- je, the inain dinlcnsions of ruhher after optimization are as follows. The length is 65 mm, the narrow end width is 10mm,the shoulder angle of inclination is 47°,and the external diameter is 110mm .The rubber size decreases by 17.39%,compared withthat before optimization .A comparison of the findinges obtained by the different optimiza-tion methods indicates that the precision of the first-order optimization method is relatively high.