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摩阻和摩扭是限制大位移井水平位移的关键问题，优选造斜段曲线可以减小摩阻和摩扭。研究了造斜段曲线的优选问题。提出了一种新的大位移井轨道，即侧位悬链线轨道及其设计方法。计算分析表明：与圆弧、抛物线和悬链线轨道相比，侧位悬链线轨道井眼长度最短，摩阻、摩扭最小，而且不需要圆弧过渡段，给设计和施工带来了方便。文中不仅给出全部计算公式，而且给出计算实例．对现场设计施工具有一定的指导意义。
Frictional resistance and frictional torsion are the key issues that limit the horizontal displacement of a large-displacement well. It is preferable that the curve of the bevel-forming section can reduce frictional resistance and frictional torsion. The optimal problem of curve making is studied. A new large-displacement well trajectory is proposed, which is the lateral catenary track and its design method. Computation and analysis show that compared with arc, parabola and catenary tracks, the lateral catenary track borehole length is the shortest, the friction resistance and the friction torque are the smallest, and the arc transition section is not needed, which brings the design and construction Convenience. The paper not only gives all the calculation formulas, but also gives the calculation examples. On-site design and construction has a certain significance.