The difference between large diameter drilling and oil drilling is reviewed with their characteristics.
论述了大直径钻井工程与石油钻井的不同特点。
The theoretical and technical problems to be researched for large diameter drilling are outlined with its application prospect appraised.
简述了大直径钻井需要研究的理论和技术问题，并对应用前景作了评价。
Based on the historical experience of drilling technology, it is proposed to study the bottom process of large diameter reverse circulation rotary drilling.
根据钻探技术的历史经验，建议应进行大直径反循环回转钻进井底过程的研究。
So it is novel tool for drilling of large diameter spiral.
从而，为大口径螺旋钻施工提供了一种新型钻具。
The effect is not apparently when using methods of large-diameter barrels, cementation and so forth during branching drilling in Cenozoic loose beds.
采用粗径岩心管、水泥封闭等方法在新生界松散层中人为叉孔有时效果不太明显。
The entering-rock problem of pouring pile through large-diameter hole drilling is always the biggest difficult problem in the fundamental construction of Guangxi.
大口径钻孔灌注桩的入岩问题，历来是广西基础施工中的一大难题。
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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