GCS Plug FMC (Walnut Shell FMC Grade) is a high-quality, natural lost circulation material (LCM) derived from processed walnut shells, specifically engineered for use in drilling fluid systems to control fluid loss and seal permeable formations. Known for its strength, resilience, and controlled particle size distribution, walnut shell FMC grade is widely used to bridge and plug fractures, vugs, and highly permeable zones without damaging the formation.

Due to its fibrous and granular structure, walnut shell particles create an effective mechanical seal within the formation, preventing excessive fluid loss while maintaining wellbore stability. It is chemically inert, non-toxic, and compatible with both water-based (WBM) and oil-based mud (OBM) systems. Its ability to withstand high pressure and temperature conditions makes it suitable for a wide range of drilling environments, including deep wells, offshore operations, and complex formations. Additionally, walnut shell is non-abrasive, ensuring that it does not cause damage to downhole tools or equipment during circulation.