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。
Formations were unconsolidated and hole deviation Angle was high, so it was difficult to recover cores from this well.
由于地层疏松，该井井斜角较大等造成取心难度大。
Formations were unconsolidated and hole deviation Angle was high, so it was difficult to recover cores from this well.
由于地层疏松，该井井斜角较大等造成取心难度大。
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