套管的椭圆度缺陷对套管的强度等性能有显著的影响。利用有限元法建立了考虑壁厚不均缺陷的膨胀套管的非线性接触力学模型,进行了有限元模拟分析,得到了套管椭圆度在膨胀前后的变化规律及其对膨胀后套管力学性能的影响,为膨胀套管的设计和进一步研究提供了一定的理论依据。
Ovality has great effect on casing strength. In this paper, by means of finite-element method the non-linear contact mechanics model is established and large numbers of simulations have been done. The variation laws of the ovality and its influence on the property of expanded casing. The results provide theoretical reference for the design of expandable casing and the further study.