Formations were unconsolidated and holedeviation 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。
3
Due to complicated geology and high dip Angle, holedeviation 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.