油井管の曲げ圧潰強度のFEM解析と計算式

概要

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In a directional well, which is promising for future well construction, a well casing is subjected to bending load due to the deviated well trajectory. Collapse strength of commercial casing under bending has rarely been evaluated, making it impossible to design casing strings for a directional well. The authors performed collapse tests under four-point bending, analyzed the collapse strength as an unstable problem by the elastic-plastic finite-element method (FEM), and established an empirical formula based on Mises' yield criterion. the elastic-plastic FEM is highly applicable, since values calculated by the FEM program agree well with those of experiments. It was found that the bending load has little influence on collapse strength compared with the conventional estimation, and that the proposed empirical formula can well estimate the collapse strength under bending.
1996-01-25