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Just as drilling fluids are integral to the bore well drilling process, additives that are very much a part of their composition, have a unique role to play. Most of these additives have distinct properties that specifically help in countering specific challenges encountered during the drilling process. They help in accomplishing the drilling work with efficiency and precision. They also help in minimizing human hazards.

Weighting Compounds —Primarily, weighting materials or compounds are used for increasing the mud density. Common examples would be barium sulfate or barite. The density of the mud needs to be increased because it is important to equilibrate the well bore pressure and the formation pressure, especially when the challenge is to drill through zones that are heavily pressurized.