Sand plug always occurred during fracturing in slant well or directional well.
斜井或定向井在压裂过程中，经常因出现砂堵导致施工失败。
Directional well has been one of the development trends in petroleum industry.
定向井已成为世界石油工业的发展趋势之一。
The control of azimuth is a knotty problem in controlling directional well trace.
在定向井轨迹控制中，方位控制是个棘手问题。
Well, it's actually the directional derivative in that direction.
它其实是那个方向的方向导数。
Well, it's actually the directional derivative in that direction.
它其实是那个方向的方向导数。
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