DRY CEMENT FORMULATION FOR CEMENTING HOLES IN THE EARTH.

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The invention relates to a dry cement formulation for cementing holes in the earth, in particular oil, gas and/or natural heat of the earth holes. Said dry cement formulation contains a) approximately 20 to 99.9 % in weight of cement, b) approximately 0 to 65 % in weight of quartz powder and/or quartz dust, c) approximately 0.1 to 30 % in weight of dispersion powder that can be redispersed in water and d) approximately 0 to 20 % in weight of additional additives. The invention also relates to the use of the dry cement formulation for producing a cement slurry and to the use of dispersion powders, that can be redispersed in water, in a cement slurry for cementing holes in the earth. The cement slurries can be used to reduce the water loss of the cement slurry, to reduce the gas and/or water penetration and/or to seal the gas and/or water channels by introducing and hardening the cement slurry in the hole.