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采用非线性有限元方法 ,按平面应变问题处理 ,分析了含磨损套管受井下非均匀外压作用时的挤毁极限载荷及挤毁失效方式 ,同时计算了含磨损套管受均匀外压作用时的挤毁极限载荷 ,与试验结果比较吻合。研究结果表明 ,套管在均匀外压下发生挤毁时 ,极限载荷最大 ,挤毁模式是套管磨损部位的管壁向管外凸出 ,屈服区主要分布在套管塌陷部位外壁及磨损部位的内壁。非均匀外压下发生挤毁时 ,挤毁模式是套管磨损部位的管壁向管内方向塌陷 ,屈服区域主要分布在套管挤毁后凸出部位内外壁及塌陷部位的内外壁。且外压分布越不均匀 ,挤毁极限载荷越低 ;套管偏心度越大 ,抗挤能力越差。
The non-linear finite element method was used to deal with the problem of plane strain. The ultimate crushing load and failure failure mode of the casing with wear under non-uniform external pressure were analyzed. At the same time, When squeezing the ultimate load, compared with the test results. The results show that the ultimate load is the highest when the casing is crushed under a uniform external pressure. The collapse mode is that the wall of the casing at the worn part protrudes out of the tube. The yield zone is mainly distributed on the outer wall of the casing collapsed part and the worn part The inner wall. In the event of collapse under non-uniform external pressure, the collapse mode is that the wall of the casing at the worn part collapses into the tube. The yield zone is mainly distributed on the inner and outer walls of the protruding part and the inner and outer walls of the collapsed part after casing collapse. And the more uneven the external pressure distribution, the lower the ultimate crush load. The larger the casing eccentricity is, the worse the anti-extrusion ability is.