封隔器胶筒结构改进及有限元分析

The Structure Improvement and Finite Element Analysis of Packer Rubber

封隔器密封失效主要由胶筒损坏引起,为了提高封隔器胶筒的密封性能,减小肩部突出,更有效地满足生产需要,设计了新型封隔器胶筒结构。利用ANSYS软件对常规和新型封隔器密封胶筒进行有限元分析计算,得到了胶筒的变形状况和接触应力沿胶筒轴向的分布情况。结果表明,靠近加载端的上胶筒所受接触应力最大,起主要密封作用;在相同条件下,对比两种结构封隔器胶筒的变形和接触应力,可知新型封隔器胶筒与套管的最大接触应力较大,接触长度较长,且肩部突出较小。因此,采用新型封隔器胶筒结构可以提高封隔器的密封性能。

Packer rubber is an elastic seal component,the seal failure is mainly caused by the rubber damage,in order to improve the sealing property of rubber,reduce the extent of shoulder extrusion and meet the production needs,this article designed a new structure of packer rubber.The finite element analysis model of the conventional and new packer were established,and the deformation and contact pressure of rubber under axial compressive forces were calculated through finite element software.As a result,the distribution of contact pressure along rubber axial direction was obtained.The result showed that the maximum contact pressure lied on the upper rubber,and it played a leading role on sealing property.Through the comparison of the deformation and contact pressure of the two kinds of packer under the same condition,the new type of packer rubber had the larger maximum contact pressure,longer contact length,smaller shoulder extrusion.Therefore,the new type of rubber can improve the sealing property of packer and has a good prospect of application.