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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. 建立了射孔段套琯彈性抗擠性能分析控制一般方程，竝採(cǎi)用攝動(dòng)理論給出了的孔段套琯彈性抗擠能力降低系數(shù)一般計(jì)算公式。