FIELD: chemistry.
SUBSTANCE: present invention relates to a dry cement mixture for cementing boreholes, particularly oil, gas and/or geothermal wells, which contains the following, wt %: 20-99.9 cement, 0-65 quartz flour and/or quartz dust, 0.1-30 water-redispersible dispersed powder and 0-20 additional additives, wherein the water-redispersible dispersed powder is derived from an aqueous dispersion which contains ionic groups. The invention also relates to use of the dry cement mixture to obtain a cement grout and use of water-redispersible dispersed powders in the cement grout for cementing boreholes. The invention is developed in subclaims.
EFFECT: reduced water loss of the cement grout, reduced leakage of gas and/or water, sealing gas and/or water channels.
15 cl, 3 ex, 2 tbl, 3 dwg
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