GROUTING MIXTURE Russian patent published in 2019 - IPC C09K8/467 C04B28/02 C04B111/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to cementing of casing strings in oil, gas and gas condensate wells, which open strata with polymineral water of high degree of mineralization, can also be used for cementing columns in one step by one composition in terrigenous deposits in presence of fresh or slightly mineralized water, in intervals of carbonate-halogen deposits, installation of insulating cement bridges. Grouting mixture contains, wt. %: plugging portland cement - 33.30–43.67, complex mineral additive KMD-H - 47.56–49.95, ultracement-10 - 3.96–13.72, accelerator of setting time of sodium chloride or calcium chloride - 2.91–4.76, the thinning reagent NTPF-17 - 0.05–0.12.

EFFECT: technical result is production of grouting composition with density of solution 1,700 ± 20 kg/m³, characterized by high spreadability and ability to form a stone with high strength, resistance to corrosion effect of polymineral formation water of high degree of mineralization at low positive and normal temperatures.

1 cl, 1 tbl