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。

youdao

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。

youdao