FIELD: oil and gas industry.
SUBSTANCE: cement mixtures intended for cementing oil and gas wells covering intervals of permeable formations at elevated temperatures. The cement composition includes cement, water and plasticizer. Saudi class G cement is used as well cement, and C-3 plasticizer is used as a plasticizer, while the composition additionally contains silica powder and nanoclay, with the following component ratio, wt.%: Saudi class G cement - 50, 40-50, 76, plasticizer C-3 - 0.40-0.41, silica powder - 17.64-17.77, nanoclay - 0.51-1.01, water - the rest.
EFFECT: increasing the efficiency of well casing under conditions of elevated temperatures.
1 cl, 6 tbl, 12 ex
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