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。
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。
Under-balanced drilling and under-balanced logging are very important techniques for directly identifying and protecting hydrocarbon reservoirs and enhancing productivity.
欠平衡钻井和欠平衡测井技术对于直接发现和保护油气层、提高单井产能和勘探开发成功率具有非常重要的意义。
Based on data review, the corrosion and erosion of metal drilling tools in under-balanced drilling are analyzed, including affecting factors, composition and application of corrosion inhibitors.
在对文献调研的基础上，综述了国内外在欠平衡钻井中对金属钻具的腐蚀与磨蚀方面所做的工作，主要包括各种影响因素的分析、相应防腐剂的组成和应用。
Comparing with the method of the drilling balance holes, it is clear that new type axial balance devices must be balanced better and accord with the engineering applications.
为了更能说明问题，并与开平衡孔方法平衡轴向力相比较，可以看出新型轴向力平衡装置轴向力平衡能力很强，更能满足工程实际。
The two technical problems faced by the technology of under-balanced horizontal well drilling with gas injection are the down-hole motor and the conventional MWD can't work normally.
注气欠平衡钻水平井技术面临的两大技术难题是井下动力钻具不能正常工作和常规MWD无法正常工作。
Analysis for a variety of vibrating screen are widely used in drilling that balanced elliptical vibration screen is the best.
分析得出目前广泛应用于钻井现场的各种运动轨迹振动筛中平动椭圆运动轨迹的振动筛筛分效果最好。
Analysis for a variety of vibrating screen are widely used in drilling that balanced elliptical vibration screen is the best.
分析得出目前广泛应用于钻井现场的各种运动轨迹振动筛中平动椭圆运动轨迹的振动筛筛分效果最好。
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