Hollow glass particles super low density slurry evaluation and application

On the basis of particle size grading principle, Hollow glass particles(HGS) were selected as the density decreasing additives, and the novel super-low-density cement was made, which not only solved the difficulties of conventional super-low-density cement, such as slow cement strength increasing, poor stability, and uncontrollable water loss, but also broke the domestic vacancy of density below 1.00 g/cm3. Indoor experiments and field tests showed that the cement slurry system exhibits good settlement stability, high compressive strength, low water loss, fine rheological behavior, effective gas channeling prevention, adjustable thickening time and short transition period, as well as good cementing quality at cement-to-formation and cement-to-casing interfaces.