WEIGHTED GROUTING MORTAR Russian patent published in 2020 - IPC E21B33/138 C09K8/467 

FIELD: mining.

SUBSTANCE: invention relates to cementing of casing strings in oil, gas and gas condensate wells, which open reservoirs with abnormally high pressures and high temperatures. Weighted backfill solution contains 37.43–39.02 wt% of Portland cement of plugging, 24.17–27.29 wt% of galenite concentrate from lead ores, 0.02–0.05 wt% nitrilotrimethylphosphonic acid, 0.08–0.23 wt% of Natrosol 250 EXR, 10.74–14.04 wt% of ground dust quartz of grade B, 2.30–4.68 wt% of condensed microsilica MK-85, and water – balance.

EFFECT: high strength of the stone in the initial period of hardening of the weighted grouting mortar and formation of a stone which is resistant to the corrosive effect of high temperatures.

1 cl, 1 tbl, 1 ex