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- W4385481161 abstract "AbstractRecently, it was found that mud flocculates, or flocs, coexist with methane hydrate within turbidite layers off the Japanese coast. There is a concern that mud flocs may be broken down by the flow of pure water generated from the dissociation of methane hydrate, causing sand troubles in the production wells. To clarify the characteristics of the flocs, in this study, the samples of mud flocs collected from natural cores having contained methane hydrate were observed before and after sonication in a pure-water ultrasonic bath. Then, these flocs were placed in distilled water flow to investigate their mechanical stability. As a result, it was confirmed that the flocs mainly consist of silt together with a little clay and fine sand. In addition, these flocs were found to be stable for flow rates on the order of magnitude of 10−3 m/s, which is expected inside the strata during gas production from methane hydrate. However, it was also found that, after the distilled water flow experiments, the flocs were decomposed into silt and clay particles when pressed with a handheld needle in the air, suggesting that the floc might be a source of the fine particles as underground stress conditions change, although not many flocs are likely to be immersed in pure water alone.Keywords: Mud flocmethane hydrateturbiditeunconsolidated sand-mud alternate layermechanical stability AcknowledgementsThis research was entrusted by the Ministry of Economy, Trade and Industry, Japan as a part of the research for production method and modelling of methane hydrate in the MH21-S R&D consortium.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the Ministry of Economy, Trade and Industry." @default.
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- W4385481161 date "2023-08-02" @default.
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- W4385481161 title "Characteristics of mud flocs in the subseabed methane hydrate reservoir and behaviours in flowing water" @default.
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- W4385481161 doi "https://doi.org/10.1080/1064119x.2023.2240355" @default.
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