双层组合套管受均匀或非均匀载荷作用的强度分析

THE STRENGTH ANALYSES OF DUAL CASING STRING FORCED IN HOMOGENEOUS AND INHOMOGENEOUS STRESS

练章华 张先普 王钢 何明烛 李渊 曾久长

Lian Zhanghua Zhang Xianpu Wang Gang He MingZhu Li Yuan Zeng Jiuchang

西南石油学院 华北石油管理局

利用EPF软件对双层组合套管进行弹塑性有限元仿真分析,其结果与西德克劳塞尔技术大学M.Brkowsky等的试验结果完全一致,证明本文的弹塑性有限元力学模型、基本假设及弹塑性增量理论的应用是正确的。因此可利用EPF软件对任何组合形式下的套管,在计算机上进行均匀或非均匀载荷作用的模拟试验来取代实际试验过程,减少实验设备的投资及实际试验的一些困难。利用EPF软件已成功地为华北油田荆丘地区提供了套管的组合形式,并建立了强度分析及径向位移变化的数学模型。本文首次对组合套管受非均匀载荷作用进行定量研究,为组合套管强度分析奠定了理论基础。

The elasticoplastic finite element simulation analyses nave been made for the dual casing strings by EPT software.The analyses results are identical with M.Brkowsky’s testing results in German Technology University.The relative error of casing collapsing strength is about 0 to 3.8 Percent.When dual casing strings forced in homogeneous stress,the casing inner diameter displacement simulated by EPT is very close to the exact solution,so that elasticoplastic finite element model,basic assumes,and the elasticoplastic of increasement theory presented in this paper have been proven.The simulating test of casing strings forced in stress can replace the real test process and decrease the expeniment equipment and the problems in real test.The EPT software has been successfully used in Huabei oil field to determine the casing strings and establish the models of change of radial displacement as well as strength analyses.

10.3969/j.issn.1000-7393.1994.04.002