初步实践表明，负压钻井技术完全适用于高压低渗地层和低压易漏地层，其效果明显。
The preliminary practices show that underbalanced pressure drilling is completely fit to high pressure and low permeability as well as low pressure and leakage formations.
在低压储层进行欠平衡钻井时常选用气体型低密度流体。
Gas drilling fluid is often used in UBD in low pressure formation.
空气钻井采用空气作为循环介质，最适低压和低渗透储层的开采。
The use of air as a circulating medium for drilling is the best way for the development of low pressure and low permeable formation.
空气钻井是目前钻速最快、最经济的欠平衡钻井作业方式之一，是低压低渗漏特别是恶性井漏钻井最实用的技术。
Air drilling is one of the fastest and cheapest drilling methods up to now. It is the most practical technology to penetrate the low - pressure and low -permeability reservoirs and leak - off zones.
本文着重低压井进行井底压力研究，参考前人欠平衡钻井流体力学参数设计理论、方法，对不同的流体介质进行了分析和研究。
Refering to the theories and methods on drilling fluid mechanic parameter design, This paper focuses on study on the pressure of bottom-hole; and then analyzes and studies different fluids media.
空气钻井主要应用于中低压地层，可以大幅度提高钻井速度，缩短建井周期，降低钻井成本，但需要昂贵的地面设备。
The air drilling may largely enhance the drilling speed, shorten the drilling time, decrease the drilling cost. The technology, however, needs expensive surface equipments. A …
空气钻井主要应用于中低压地层，可以大幅度提高钻井速度，缩短建井周期，降低钻井成本，但需要昂贵的地面设备。
The air drilling may largely enhance the drilling speed, shorten the drilling time, decrease the drilling cost. The technology, however, needs expensive surface equipments. A …
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