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A LOT is intended to determine the point of leak-off.
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A high permeability zone that takes fluids from the wellbore and the conventional filter cake building materials have no effect on fluid losses.
Same as lost circulation control materials.
During circulation, when less fluid returns to the surface than was injected into the well. Severe lost circulation is the loss of all returns.
The fluid lost from the well expressed in volume per time.
In a drilling context, kwn is kill weight mud.