Additive for drilling mud
AssigneeDai-Ichi Kogyo Seiyaku Co., Ltd.
InventorsYousuke Goi, Mineo Sabi, Kazuhito Jinno, Koji Noda
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Abstract
To provide an additive for drilling mud, used in drilling for petroleum, natural gas, civil engineering, mines, etc., which has high heat resistance and high mechanical shear resistance, of which the viscous property does not degrade even under high-temperature and high-shear conditions; has high pseudoplastic flowability and therefore secures high flowability during discharging; and is a naturally-derived one and is therefore highly biodegradable and has least adverse impact on environment. An additive for drilling mud, which contains cellulose fibers having a number-average fiber diameter of from 2 to 500 nm and a fiber aspect ratio of 50 or more and having a cellulose I-type crystal structure.
Claims18
An additive for drilling mud, which comprises cellulose fibers having a number-average fiber diameter of from 2 to 500 nm and a fiber aspect ratio of 50 or more and having a cellulose I-type crystal structure, wherein the cellulose fibers are cellulose fibers in which a hydroxyl group at C6-position in each glucose unit has been selectively modified through oxidation into any of an aldehyde group, a ketone group and a carboxyl group, and a content of the carboxyl group falls within a range of from 1.2 to 2.5 mmol/g.
Dependencies are inferred from the claim text.