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Lost circulation material for oil well drilling

In oil or gas well drilling, lost circulation occurs when drilling fluid, known commonly as "mud", flows into one or more geological formations instead of returning up the annulus. Lost circulation can be a serious problem during the drilling of an oil well or gas well.
Lost circulation can be divided into the following categories:

Seepage: up to 10 barrels per hour

Partial: 10 - 50 barrels per hour

Severe: >50 barrels per hour

Total: 100%

The "Condor 39" has been proved to be a good LCM for oilfield applications. The deformable plastic solid particles can efficiently plug/seal high permeability formations. Based on industrial experiences this can be extended to fractured/vugular formations as well.  

LCM "Condor 39"