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Multi-scale elastoplastic mechanical model and microstructure damage analysis of solid expandable tubular

Chinese Physics B 2020年第10期29卷 336-348页

作者： Hui-Juan Guo Ying-Hua Liu Yi-Nao Su Quan-Li Zhang Guo-Dong Zhan Department of Engineering Mechanics AMLTsinghua UniversityBeijing 100084China Drilling Mechanical Department CNPC Engineering Technology R&D Company LimitedBeijing 102206China Drilling Technology Division EXPEC Advanced Research CenterSaudi Arabia

We present an in-depth study of the failure phenomenon of solid expandable tubular (SET) due to large expansion ratio in open holes of deep and ultra-deep wells. By examining the post-expansion SET, lots of microcracks are found on the inner surface of SET. Their morphology and parameters such as length and depth are investigated by use of metallographic microscope and scanning electron microscope (SEM). In addition, the Voronoi cell technique is adopted to characterize the multi-phase material microstructure of the SET. By using the anisotropic elastoplastic material constitutive model and macro/microscopic multi-dimensional cross-scale coupled boundary conditions, a sophisticated and multi-scale finite element model (FEM) of the SET is built successfully to simulate the material microstructure damage for different expansion ratios. The microcrack initiation and growth is simulated, and the structural integrity of the SET is discussed. It is concluded that this multi-scale finite element modeling method could effectively predict the elastoplastic deformation and the microscopic damage initiation and evolution of the SET. It is of great significance as a theoretical analysis tool to optimize the selection of appropriate tubular materials and it could be also used to substantially reduce costly failures of expandable tubulars in the field. This numerical analysis is not only beneficial for understanding the damage process of tubular materials but also effectively guides the engineering application of the SET technology.

关键词： solid expandable tubular(SET) material microstructure damage multi-scale elastoplastic model virtual failure

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