Taking into account the rotating effect of the drillstring, this paper presents a bifurcating differential equation for the rotating slender drillstring being in tension in vertical well section.
考虑到垂直井中钻柱受拉段在旋转时的转动效应，建立了顶部悬挂、受分布浮重作用的旋转细长钻柱的分岔微分方程。
参考来源 - 垂直井中旋转钻柱受拉段分岔研究 STUDY ON BIFURCATION FOR TENSILE·2,447,543篇论文数据，部分数据来源于NoteExpress
Drilling a horizontal well is more difficult than a vertical well.
水平井比垂直井更难钻。
Study shows that horizontal well is better than vertical well for improving production result.
研究表明：水平井比直井更利于改善和提高油田开采效果。
The technology is the same with vertical well, also with high Angle deviated hole, and has broad application range.
该项工艺不仅适用于直井，也适用于大斜度井，因而，适用范围大，应用前景广。
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