MODIFIED CEMENT COMPOSITION, PREPARATION AND APPLICATION THEREOF

摘要

Light to ultra-light cement compositions with modified rheological properties. The cement composition includes cement, hydrophobic nano-silica, at least one additive and a sufficient amount of water to make a cement slurry with high compressive strength, low porosity, low free water, and low fluid loss with a quick thickening time.

主权项

1. A method of making a modified cement composition comprising:
(a) mixing cement with hydrophobic nano-silica particles; and (b) adding at least one additive to the mixture in step (a); wherein (i) if the at least one additive is a plurality of microspheres, the plurality of microspheres are first added directly to the cement and the hydrophobic nano-silica particles, and then water is added to the mixture of the cement, the hydrophobic nano-silica particles, and the plurality of microspheres and (ii) if the at least one additive is not a plurality of microspheres, then the additive is first add to water to make a water-additive mixture and then the water-additive mixture is mixed with the mixture in step (a).