封隔器卡瓦接触应力研究

封隔器上的卡瓦锚定后起到支撑封隔器、锁定胶皮筒的作用,其性能好坏直接影响到油井的产量和生产安全。卡瓦与套管间的咬合力分布决定了封隔器在使用中的成败。咬合力的分布是否合理,将直接关系到套管的损伤程度及卡瓦的寿命。文中同时应用有限元法和三维光弹性技术对封隔器卡瓦进行了接触应力分析,介绍了实验模型的建立和实验步骤以及计算模型的建立和边界条件的考虑,比较了数值计算与三维光弹实验的结果,分析了造成误差的原因。实验应力分析结果为有限元计算模型的建立及边界条件的确定提供了重要的实验保证。研究工作获得了一些重要的结果,为封隔器卡瓦的优化设计提供了相关的参数。

A Study on Contact Stress of Packer Slip

The slips in the packer is for supporting packer and for locking rubber after anchoring.The capability of the slips influences directly on oil well yield and productive safety.Distribution of occlusive force between slip and sleeve is a key for success of packer in engineering application.The rational distribution of occlusive force is related to the damage level of sleeve and lifespan of slip.In this article,the finite-element method and 3-D photoelastic technique were both performed to analyze the contact stress of the packer slip.The formation of the experimental model,experimental procedure,the formation of calculation model and the consideration of boundary conditions were presented.The numerical results were compared with the experiment data of 3-D photoelastic model and the induced error is analyzed.The results of experimental stress analysis offer important assurance for construction of finite element model and confirmation of boundary conditions.Some important results are gained from present study and some correlative parameters are provided for optimum design of the packer slip.