GLYSLIDE is a medium cloud point polyalkylene glycol synthesized through the open-loop polymerization of starters, ethylene oxide (EO), and propylene oxide (PO). In water-based drilling fluids, GLYSLIDE enhances lubricity, stabilizes active shales, controls rheology, and maintains thermal stability. Its effectiveness stems from its ability to form protective films, suppress hydration, and enhance rheological properties. Combining GLYSLIDE with salts such as KCl, NaCl, or NaHCOO in drilling fluids creates a synergistic effect, leveraging the unique properties of each component to improve overall performance. This combination is particularly effective in shale stabilization and maintaining wellbore integrity. GLYSLIDE polyalkylene glycols have a distinctive capacity to enhance the performance of water-based drilling fluids without necessarily increasing viscosity.