Air and Gas drilling is one of the most important parts of under-balanced drilling techniques, which now is being used all over the world because of its benefits.
空气钻井是欠平衡钻井的重要分支。
参考来源 - 空气螺杆钻具螺杆衬套副设计研究·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
Air drilling is a kind of under-balanced drilling technology with air, whose rock breaking form is different from conventional mud drilling.
空气钻井技术是以空气作为循环介质的欠平衡钻井技术，其钻头的破岩形式与常规泥浆钻井有很大的区别。
Calculation results show that they accurately reveal the distribution pattern of pressure in wellbore during under-balanced drilling operation.
计算结果表明，该套公式较为精确地模拟了欠平衡钻井过程中井眼压力分布的规律。
The under-balanced drilling technology is based on how to control the bottom negative pressure which is related to the pressure computation of multiphase flow in annulus .
井底负压值控制是欠平衡钻井技术的基础，而井底负压值的大小与环空多相流的有关压力计算有关。
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