pressure balanced drilling bumper sub 压力平衡式钻井震击器
non balanced drilling 非平衡钻进
balanced drilling techniques 平衡钻进
under-balanced drilling technique 欠平衡钻井技术
under-balanced drilling technology 欠平衡钻井技术
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
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。
The principle of reaching balance drilling and under balanced drilling using foam mud in water well drilling in Karst formation was presented.
分析了岩溶地层水文水井施工中，泡沫实现平衡压力或欠平衡压力钻井的原理及影响泡沫钻井有效井眼压力的因素。
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。
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