Asphasol Supreme sulfonated-asphalt shale inhibitor is used to aid in stabilizing shale sections, controlling solids dispersion, and improving filter cake characteristics. It is also used as a supplemental high-temperature fluid-loss additive for water-based drilling fluid systems.

This inhibitor is a free-flowing powder and can be added directly to the mud system through the mixing hopper. It is not necessary to pre-mix Asphasol Supreme inhibitor with oil. It contains no surfactants.

Normal concentrations of this inhibitor range from 3 to 6 lbm/bbl [8.6 to 17.1 kg/m3] for shale stabilizing control and 6 lbm/bbl [17.1 kg/m3] for high-temperature fluid-loss control.