GROUTING MATERIAL Russian patent published in 2003 - IPC

FIELD: well cementing; applicable in oil and gas producing industry. SUBSTANCE: grouting material includes Portland cement clinker, gypsum and mineral additive in form of granulated blast-furnace slag or granulated blast-furnace slag and fly ash with marl or clay with the following amounts of components, wt. %: mineral additive 10-30; gypsum 3-8; the balance, Portland cement clinker. EFFECT: increased quality of grouting due to introduction into grouting material composition of components reducing water separation, and thickening of cement stone. 4 cl, 2 tbl