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.
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。
This paper mainly points at produced bigger deviation problem when apply formulas about the hydraulic calculation of DIP in recent years, and analyses some common formulas about head-loss.
本文主要针对近年来普遍使用的球墨铸铁管在套用已有的水力计算公式进行计算时产生偏差较大的问题，对常用的几个水头损失计算公式进行了一些分析。
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.
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.
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。
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