This paper gives the elastic differential equation of collapse of perforated casing, and a general formula for reduction factor of elastic collapsing by perturbation method.
建立了射孔段套管弹性抗挤性能分析控制一般方程，并采用摄动理论给出了的孔段套管弹性抗挤能力降低系数一般计算公式。
Serious casing wear greatly reduces the collapsing strength and corrosion life.
套管磨损严重时，将使套管的抗挤毁能力和腐蚀寿命大大下降。
To solve this problem, a special casing - TP130TT high collapsing strength heavy casing has been developed.
针对这一问题，开发了一种特殊套管——TP130 TT高抗挤厚壁套管。
To solve this problem, a special casing - TP130TT high collapsing strength heavy casing has been developed.
针对这一问题，开发了一种特殊套管——TP130 TT高抗挤厚壁套管。
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