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CEMENT ADDITIVES » LOST CIRCULATION MATERIALS
GLC 1 Cellophane flake; utilized with fluid loss additives to prevent loss of entire cement slurry to thief zones; optimum concentration is 0.125 to 0.25 lb./sk of cement.
GLC 2 Graded ground coal, high melting point, utilized to prevent loss of entire cement slurry to thief zones; effective in all types of cement slurries at all temperatures; normal concentration is 12.5 to 25 lb./sk of cement.
GLC 3 Ground gilsonite; utilized to prevent loss of entire cement slurry to thief zones and as an extender, with a melting point of 380°F (193°C), normal concentration is 5 to 20 lb./sk of cement.
GLC 4 Ground rubber; prevents loss of entire cement slurry to thief zones.
GLC 5 Carbo beads; sized carbon spheres utilized in all types of cement systems to prevent loss of entire cement slurry to thief zones.
GLC 6 Treated cellulose fibers utilized to prevent loss of entire cement slurry to thief zones.
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