SP-101 water-based-mud fluid loss control additive is a medium-molecular-weight, anionic additive used to reduce fluid loss in freshwater and seawater muds. This synthetic additive has a high temperature limit and is not subject to bacterial degradation.

SP-101 additive is an effective additive for reducing fluid loss and stabilizing rheology in a wide range of water-based systems, including low-solids, non dispersed, and dispersed weighted systems. It is most effective in freshwater fluids that are low in soluble calcium. This additive is used most often in low-solids, non dispersed polymer systems such as the POLY-PLUS system and in high-temperature applications. Normal treatments range from 0.5 to 1 lbm/bbl [1.43 to 2.85 kg/m3].