OIL-WELL CEMENT SLURRY

摘要

The invention relates to a high-performance cement comprising an alumnic cement with an aluminium content of at least more than 30 %; microsilica with a grain size of 0.1 -20 ñm whereby the percentage thereof is 35 % less by weight in comparison with the weight of the cement; mineral particles with a grain size of 0.5 - 500 ñm whereby the percentage thereof is 35 % less by weight in comparison with the weight of the cement, the percentage of said particles being less than that of the microsilica; a water-soluble polymer fluidifying agent whereby the percentage thereof is 0.2 3.0 % in comparison with the weight of the cement; a retarding agent which is used to control the setting time of the slurry; an amount of water the maximum thereof corresponding to 40 % in relation to the cement. .