In oilfield experiment several different kinds of offset-axes bottom-hole assembly are applied in various formation and borehole size in order to study deviation controlling ability of it.
试验过程中，通过在不同地层、不同井眼尺寸条件下应用不同的偏轴钻具组合方式，研究偏轴钻具的防斜能力。
In view of the leakage of complex formations, in which the size and shape of leakage path change with the variation of borehole pressure, the concept of "Strong cohesiveness" is presented.
针对漏失通道的尺寸、形状随井内压力变化的复杂井漏，提出了“强粘接性”概念。
Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
The large-diameter gas drainage well laid out in the Xuandong No. 2 Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
The large-diameter gas drainage well laid out in the Xuandong No. 2 Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
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