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水平井造斜后井迹弯曲，使管柱入井时受到的阻力远比直井大，给钻井作业增加了难度，因此对管柱摩擦阻力的分析计算是保证管柱顺利入井的关键。通过建立管柱受力平衡方程，推导出水平井管柱入井时摩阻计算的力学模型，分析计算了在稳定和旋转方式下管柱入井时的大钩载荷和井口扭矩等重要技术参数的解析公式。实例计算分析表明，摩擦阻力计算结果可为钻井设备选型、优化管柱参数和井身结构以及选择下入方式提供可靠依据。
After the horizontal well is bent, the track is bent, which makes the resistance of the pipe string larger than that of the vertical well. This makes it more difficult for the drilling operation. Therefore, the analysis of the frictional resistance of the pipe string is the key to ensure the pipe string entering the well smoothly. Through the establishment of the stress equilibrium equation of the pipe string, the mechanical model of the frictional resistance of the horizontal well string into the well is deduced. The analytical formula of the important technical parameters such as the hook load and the wellhead torque when the pipe string enters the well under steady and rotating modes is analyzed and calculated . The case study shows that the calculation results of frictional resistance can provide a reliable basis for selecting drilling equipment, optimizing the parameters of wellbore and the structure of wellbore, and choosing the way in and out.