【摘要】 从液压状态下管柱宏观受力出发，导出了管柱弯曲的基本微分方程，给出了管柱发生失稳弯曲的条件，阐明了油井管柱分析中的中和点概念；从液压状态下管柱微观应力状态出发，推导了弯曲中和点的表达式，进一步明确了液压状态下管柱弯曲中和点应定义为管柱可能失稳弯曲与不可能失稳弯曲的分界点。分析了这两种弯曲中和点的一致性。更多还原

【Abstract】 The differential equation for lateral deflection of a tube is derived based on applied force,the condition for tubing buckling is presented and the concept of a neutral point is stated in analysing tubular buckling.Also,the expression for the neutral point of tubular buckling is given from the stress state of tubular buckling and the consistency for two types of buckling neutral points is analysed.更多还原