利用气体型流体进行欠平衡钻井，或钻易漏地层时，流体密度及井下液柱压力的确定十分重要。
When underbalanced drilling or drilling easy leaky zone by using aeration fluid, the determination of fluid density and downhole fluid column pressure is very important.
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.
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