东9井由于地层倾角大，用常规防斜措施难以保证井身质量。
Because of the big stratigraphic dip in the well Dong 9, it is hard to keep the well bore quality by means of conventional deviation control measures.
河坝1井上部陆相地层属于高陡构造，地层倾角大，极易发生井斜。
The upper continental formations are high dip angle structures in Heba 1 Well.
玉门油田青西区块地质情况复杂、地层倾角大、容易发生井斜，长期以来一直是提高钻井速度的一个瓶颈。
Due to complicated geology and high dip Angle, hole deviation is easy to take place in Qingxi area of Yu-men oilfield, it is the bottle-neck for improving penetration rate for a long period.
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