Nissan Chemical Corporation

Masaki Kimata

Satoru Murakami

Isao Oota

A borehole cement slurry additive that is capable of suppressing the generation of free water from cement slurries in any environment, whether cold regions, mild regions, or hot regions; and a method for storing the same. The borehole cement slurry additive contains: an aqueous dispersion of silica having an average particle size of 3-200 nm as determined via dynamic light scattering; and a compound having an alcoholic hydroxyl group as a dispersion stabilizer, the compound being included in an amount of 1-30 mol per 1,000 g dispersion medium in the aqueous silica dispersion.

Borehole cement slurry additive, method for storing same, borehole cement slurry, and borehole cementing method

An additive capable of suppressing generation of free water from a cement slurry even under a high temperature environment of 150&#xb0; C. or more and a silica-based additive that suppresses, in a cement slurry for cementing in oil fields and gas oil fields, free water under high temperature and high pressure environments of 100&#xb0; C. or more, the silica-based additive containing an aqueous silica sol containing nanosilica particles with a true density of 2.15 g/cmor more and less than 2.30 g/cm, and a cement slurry for cementing that contains the silica-based additive.

Silica-based additive for cementing composition, cementing composition, and cementing method

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.

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Sodegaura, Japan

Masaki Kimata