...井壁稳定性 井斜[gap=1758]nics ; air drilling; rock breaking; anisotropy; finite elements; wall stability; hole deviation...
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大坝观测孔有效铅垂空间的确定-中国矿业商务网_资讯中心 关键词 大坝 观测孔 孔斜 有效圆 约束圆 [gap=441]Key words dike-dam, observation hole, hole deviation, valid circle, restrained circle
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... 垂深和测深vertical depth and measured 水平投影长度hole deviation 水平位移displacement or closure distance ...
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Also it is difficult to control hole deviation.
因此，钻进效率低，回次进尺短，孔斜不易控制。
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。
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。
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