GROUTING COMPOSITION FOR INSULATION OF ZONES OF INTENSIVE ABSORPTION Russian patent published in 2015 - IPC C09K8/467 

FIELD: chemistry.

SUBSTANCE: grouting composition for insulation of zones of intensive absorption, includes Portland cement, semi-water gypsum, clay, foam generator and water, it also additionally contains calcium chloride, hydroxyethylcellulose and inert additive. As clay composition contains palydorskite, either montmorillonite or kaolin thermally activated mud powder, and as foam generator, and anionic or amphoteric surface-active substance SAS, with the following component ratio, wt.p.: Portland cement 76.0-91.9; semi-water gypsum 4.0-16.0; said clay powder 4.0-20.0, inert additive 0.1-4.0, said foam generator 0.1-0.5; potassium chloride 4.0-12.0; hydroxyethylcellulose 0.1-0.2; with water-solid ratio 0.6-1.0, which mixture of Portland cement, semiwater gypsum, said clay powder and inert additive constitutes 100 wt.p.

EFFECT: increased degree of insulating properties of claimed composition with insulation of intervals of absorption of well liquids in porous, cavernous fractured rocks, with opening of conducting channels from 1 mm to 10 mm, due to reduced density and high composition thixotropy, as well as due to formation of non-erodible and non-permeable cement stone with high adhesive properties to rock and increased strength characteristics.

4 cl, 2 tbl