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在油田使用连续油管柱作业中,求解连续油管的最大下入深度问题时,必须满足最大抗拉强度条件、摩擦阻力条件和屈曲变形条件及其确定的方法和原则。而在下入过程中摩擦综合阻力又是求解的关键。求解摩阻力时,可针对连续油管在井身中不同结构段的不同变形形状,采用求解径向接触反力时求一个螺距内平均接触反力的方法加以解决。按照这种方法,采用安全计算工况,对新疆石油管理局八一井区8607侧钻水平井进行了连续油管冲砂作业时最大下入深度的编程计算,计算结果表明,连续油管的下入深度可满足侧钻水平井冲砂工艺要求。
In the field of using coiled tubing string in oilfields, the maximum tensile strength, frictional resistance and buckling conditions must be satisfied when determining the maximum penetration depth of coiled tubing. In the process of entering the friction resistance is the key to solving. When solving the frictional resistance, according to the different deformation shapes of coiled tubing in different structural sections of the wellbore, the method of finding the average contact reaction force in a pitch can be solved by solving the radial contact reaction force. According to this method, the safe working conditions were used to calculate the maximum depth of undercutting of 8607 sidetrack horizontal well in Bayi well in Xinjiang Oilfield Administration. The calculation results show that the coiled tubing Depth to meet the sidetrack horizontal well sand flushing process requirements.