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US 11,753,572 B2Granted
Additive for cement slurry for well and method for producing said additive, cement slurry for well, and cementing method for well
AssigneeNissan Chemical Corporation
InventorsSatoru Murakami, Masaki Kimata, Isao Oota
Life of this patent
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Abstract
An additive for a cement slurry for a well that is capable of suppressing the generation of free water and preventing flotation/separation of low-specific-gravity aggregate while securing sufficient cement strength even at a high temperature and a method for producing this additive are disclosed. The additive contains an aqueous dispersion of silica and a layered silicate.
Claims17
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.
5 more elements
An additive for cement slurry for a well, comprising:
- an aqueous dispersion having a pH of 2 to 11 comprising layered silicate which comprises at least one layered silicate selected from the group consisting of montmorillonite, hectorite, saponite, stevensite, beidellite, volkonskoite, nontronite and sauconite;
- and
- silica,
- wherein,
- a solid content concentration of the layered silicate is 0.5 to 3% by mass,
- a solid content concentration of the silica is 1 to 25% by mass,
- a mass ratio of the layered silicate to the silica is 0.02 to 0.08,
- an average particle size of a dispersoid in the aqueous dispersion by laser diffractometry is 0.5 to 20.0 μm;
- and
- said additive is not a cement composition.
7 more elements
Dependencies are inferred from the claim text.