Mud Loss Calculation
The length of the annulus or the length of the low-density fluid and mud
density of the lost circulation can be calculated based on annulus capacity
behind the drill collar. If the lost circulation volume is smaller than the annulus volume against the drillpipe, the length of the annulus (i.e., loss height)
can be expressed in terms of the volume of the low-density fluid pumped
to balance the formation pressure, and annulus capacity. Mathematically,
If Vl
< Van_dp, the length of the low-density fluid required in order to balance the formation pressure is given by:
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