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
水平井比垂直井更难钻。
Drilling a horizontal well is more difficult than a vertical well.
按该理论方法还可以导出垂直井、压裂井的试井计算式。
From the theory and analysis method presented here we can also derive well testing calculation equations for vertically fractured well.
无论垂直井还是水平井系统，采收率都随流度比的增加而减少。
For both vertical and horizontal well systems, oil recovery decreases with increasing mobility ratio.
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