在钻井工程上，钻井液密度（Drilling Fluid Density）和钻井液比重（Mud Weighi）是两个等同的术语。控制密度对于预防井喷是必不可少的，有时，为了稳定井壁也必须控制密度。
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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.
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。
By using the technique of aerating Nitrogen gas in the low density base drilling fluid, excellent exploration results have been successfully obtained in Well Fengshen-1.
通过在低密度基液中利用充氮技术，丰深1井成功地进行了勘探施工，取得了良好的勘探效果。
The low density drilling fluid has borehole excavation effect on compensated neutron porosity logging, and by this way apparent porosity is lower than the true value.
低密度井眼流体会对补偿中子孔隙度测井产生井眼挖掘效应，使视孔隙度值低于真孔隙度，且井眼流体密度越小，井眼尺寸越大，地层孔隙度越大，井眼挖掘效应越明显。
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