Acid Corrosion Inhibitors Asphaltene Inhibitors Oxygen Scavengers Iron Sulphide Scavengers Hydrogen Sulfide Scavengers Oil Mud Thinners Bactericides Anti-Foulants Wetting Agents Rheology Modifiers Mutual Solvents Fluid Loss Additives Coagulating Agents Silt Suspenders Silt Suspenders Anionic Surfactants Foaming Agents Caustisized Lignite Non-Ionic Surfactants Defoaming Agents Friction Reducers Primary Emulsifiers Iron Control Agents Anti-Sludge Secondary Emulsifiers Clay Stabilizers Emulsion Breakers