The results show that the natural fracture length and dip angle have great influence on the casing failure, and the increase of casing wall thickness could not reduce casing failure.
分析结果表明：天然裂缝长度和倾角对套损有较大影响，但增加套管壁厚不能缓解套损。
The influence of wall thickness nonuniformity on the property of the expandable casing is analyzed by the finite element analysis.
采用有限元法分析了壁厚不均缺陷对膨胀套管性能的影响。
A 5tool measures the casing-wall thickness either electromagnetically or mechanically.
下井仪器按照电磁学原理或者机械原理测量套管壁厚。
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