CPC C09K 8/48 (2013.01) [C04B 14/06 (2013.01); C04B 14/104 (2013.01); C04B 18/027 (2013.01); C04B 28/02 (2013.01); C04B 40/0039 (2013.01); E21B 33/14 (2013.01); C04B 2103/24 (2013.01); C04B 2111/00706 (2013.01); C04B 2111/40 (2013.01)] | 17 Claims |
1. An additive for cement slurry for a well, comprising:
an aqueous dispersion of layered silicate; and
silica,
wherein
a solid content concentration of the layered silicate is 0.01 to 5% by mass,
a solid content concentration of the silica is 0.3 to 30% by mass,
a mass ratio of the layered silicate to the silica is 0.01 to 0.1, and
an average particle size of a dispersoid in the aqueous dispersion by laser diffractometry is 0.1 to 30.0 μm.
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