Silica-based additive for cementing composition, cementing composition, and cementing method
AssigneeNissan Chemical Corporation
InventorsSatoru MURAKAMI, Masaki KIMATA, Isao OOTA
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Abstract
An additive capable of suppressing generation of free water from a cement slurry even under a high temperature environment of 150° 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° C. or more, the silica-based additive containing an aqueous silica sol containing nanosilica particles with a true density of 2.15 g/cm3 or more and less than 2.30 g/cm3, and a cement slurry for cementing that contains the silica-based additive.
Claims8
A silica-based additive that suppresses, in a cement slurry for cementing in oil fields and gas oil fields, generation of free water from the slurry under high temperature and high pressure environments of 100° C. or more and 300° C. or less, the silica-based additive comprising an aqueous silica sol containing nanosilica particles with a true density of 2.15 g/cm3 or more and less than 2.30 g/cm3.
Dependencies are inferred from the claim text.