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采用段铣套管开窗方式进行侧钻中半径水平井时，设计确定出合理的段铣套管长度及井眼轨迹，对于施工时有效控制井眼轨迹尤为重要。该文在理论和实践基础上，提出了段铣套管长度及井眼轨迹的设计方法，并给出相应的计算模式。
When using the section milling casing to open the window for the radius horizontal drilling in the sidetrack, the design of the section length and well trajectory is reasonable, which is very important for controlling the well trajectory effectively. On the basis of theory and practice, this paper puts forward the design method of the section length and well trajectory of section milling and gives the corresponding calculation mode.