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.
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