FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, in particular to grouting mixtures intended for cementing oil and gas, hydrogeological and geothermal wells covering intervals of permeable formations at normal and high temperatures. Grouting composition includes high-sulphate-resistant grouting portland cement, pozzolanic additive in form of metakaolin, dispersant CFR-3 and/or setting retarder HR-5, water loss reducing additive HALAD-322 and water, with the following ratio of components, wt.%: high-sulphate-resistant grouting portland cement – 30.0-64.9; metakaolin – 5.1-35.0; said setting retarder and/or dispersant – 0.1-1.5; said additive for reducing water loss – 0.1-1.0; water – balance.
EFFECT: improved efficiency of cementing at high temperatures.
1 cl, 2 tbl, 3 ex
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