GROUTING MIXTURE Russian patent published in 2002 - IPC

FIELD: oil and gas producing industry. SUBSTANCE: invention may be used in drilling of holes in geological prospecting at coal deposits, particularly, grouting slurries for hole cementing and lost circulation control. Grouting mixture including portland cement and fly ash contains additionally wastes of anthracite dressing with the following ratio of components, mas.%: portland cement, 30-50; fly ash, 25-50; slime of wastes of anthracite dressing, 20-35. EFFECT: reduced density of grouting slurry with simultaneous increase of strength and corrosion resistance of cement stone. 1 tbl, 14 ex