FIELD: well drilling. SUBSTANCE: invention relates to drilling oil and gas wells, in particular to lining boreholes in cavern-formation and sludge-accumulation zones. Suitable grouting mortar contains, wt parts: cement 100, calcium chloride 2-2.5, water 45-50, and, additionally, soda ash 1.5-2.0 and manganese dioxide 0.4-1.0. EFFECT: accelerated structure formation and preserved strength of cement stone under water-inflow and hydrogen sulfide aggression conditions. 1 tbl
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