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中文摘要：
在油田固井质量优化的研究中,由于地质条件和施工工艺等因素对固井水泥环的影响,套管外壁所受载荷的非均匀性增强,处于复杂的应力状态下,容易发生损坏现象。以N80套管为例,根据岩石力学和弹塑性力学理论,运用ABAQUS有限元分析软件建立地层-水泥环-套管机理研究的有限元模型,针对水泥环性能、居中情况、缺失情况等不同固井质量下,进行了仿真分析。研究结果表明,高强度、大刚度、无缺失、居中良好的固井水泥环是保护套管防止损坏的最佳固井质量。上述方法的研究成果为固井质量差导致套管失效提供了理论依据。
英文摘要：
Due to the geological conditions, the drilling construction technics and other reasons, the heterogeneity of load on the casing will get increased , and be under complex stress state , which leads it prone to failure and dam- age. As an example with N80 casing wear, based on the theory of rock mechanics and elastic-plastic mechanics, we used a software ABAQUS to construct the model of formation concluding cement and cased for finite element analysis in view of the problems on the performance of cement sheath, degree of centered and deficiency of material. The re- sults of research demonstrate that the cementing quality with higher strength, larger stiffness, no deficiency and better centered degree is the best to protect easing from failure. The method and achievements in the paper provide the theo- retical supports for casing damage by poor cementing quality.
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