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

FIELD: mining.

SUBSTANCE: invention relates to the field of construction and maintenance of wells, in particular to backfill mixtures for cementing of casing strings, gas condensate and oil wells, complicated by the presence of loosely bound, perennially frozen fractures susceptible to hydraulic fracturing. Backfill mixture contains 46.6–59 wt% of portlandcement, 6.6–10 wt% of silica gel, 3.3–6.6 wt% of calcium oxide and water – balance.

EFFECT: technical result is development of plugging mixture composition, at which formed cement stone has high values of bending strength.

1 cl, 1 tbl