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。
2
It requires a certain degree of fence, a certain density (refers to the vertical column), but also a certain intensity.
它要求护栏有一定的高度，一定的密度(指竖栏)，还要有一定的强度。
3
With an example of eccentric column capacity, a potential function that satisfies the boundary conditions is formed to obtain corresponding electromagnetic field and its energy density.