It is a classic anti-collapse plugging agent and lubricant/drag reducer in water-based drilling fluid systems, and also has auxiliary functions such as reducing filtration loss, inhibiting shale hydration, and improving mud cake quality. Its core characteristics are strong plugging ability, excellent lubrication, and temperature and salt resistance. It is suitable for easily collapsing and leaking shale formations, fractured zones, and salt-cement slurry systems, and is a key additive in drilling fluids that balances wellbore stability and drilling efficiency.