GROUTING MORTAR Russian patent published in 2019 - IPC C09K8/467 C04B28/02 C04B22/06 C04B22/08 C04B18/14 C04B24/38 C04B111/20 

FIELD: construction.

SUBSTANCE: invention relates to construction of wells, in particular to grouting mortar for cementing of casing strings, gas condensate and oil wells, complicated by availability of loosely bound, perennial permafrost-susceptible to hydraulic fracturing. Grouting mortar containing plugging Portland cement, expanding component and 4 % aqueous solution of calcium chloride additionally contains microsilica, and as expanding component there used is calcium oxide, with the following ratio of components, wt%: calcium oxide 10–15, microsilica 12–16, 4 % solution of calcium chloride 0.6–0.7, plugging Portland cement – the rest.

EFFECT: creation of composition with improved performance characteristics and increased activity of expanding component, increasing adhesion properties of plugging stone, which reduces its deformation properties in wide temperature range.

1 cl, 1 tbl