The bending failure stability accrued with the increase of the running load, when the small size casing, which was run into the wellbore under the deep well, encountered the resistance.
深井小尺寸套管下入遇阻时，随着下放力的增加，将产生失稳弯曲。
In bending failure test pieces, after crack chemistry grouting, the bending rigidity slightly has increased, but the limit load-carrying capacity has no obvious variety.
正截面试件，裂缝灌浆后刚度略有提高，但极限承载力无明显变化。
In bending failure test pieces, after crack chemistry grouting, the bending rigidity slightly has increased, but the limit load-carrying capacity has no obvious variety.
正截面试件，裂缝灌浆后刚度略有提高，但极限承载力无明显变化。
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