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, wt.%: Portland cement PCT-I-50 62.1-62.2; water 31.2-31.4, as carbon black, a mixture of nanoadditives 0.3-0.45; silica smoke 6.0-6.4. The mixture of nanoadditives comprises Graphene Oxide GLC-GO, Carbon nanotubes CAS 308068-56-6, Nanosilica OSCh CAS 112926-00-8 at the following ratio in wt.% of the mass of the cement composition: 0.1:0.1:0.1, or 0.15:0.1:0.1, or 0.15:0.15:0.1, or 0.15:0.15:0.15 respectively.
EFFECT: increasing the efficiency of well casing under conditions of elevated temperatures.
1 cl, 1 tbl, 16 ex
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