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Effect of hydrate distribution on effective thermal conductivity changes during hydrate formation in hydrate-bearing quartz sands

机译：水合物含油砂水合物形成过程中水合物分布对有效导热性变化的影响

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摘要

The effect of hydrate distribution on the effective thermal conductivity changes of the actual hydrate-bearing sediments is uncertain. To define this effect, in the hydrate-bearing quartz sands, the effective thermal conductivity was measured by the transient hot-wire method, and hydrate distribution was analyzed by the electrical resistance changes. At first, the effective thermal conductivity changes were investigated from gas saturation, gas pressure, water saturation, water pressure, and temperature. Afterward, in three kinds of hydrate formation processes, compared with hydrate distribution, the changing trends of the effective thermal conductivity at five measuring points were analyzed. The results showed that the effective thermal conductivity was increased with decreasing gas saturation and increasing water saturation or water pressure, and impacted slightly by gas pressure and temperature. Moreover, at five measuring points, the non-uniform hydrate distribution caused different changing trends of the effective thermal conductivity during hydrate formation. In the excess-water setting, an increasing trend was only observed at some local measuring point. The decreasing trends at the most of the measuring points were governed by the reduced water distribution. But in the excess-gas setting, at the most of the measuring points, this increasing trend was observed and controlled by the enlarged hydrate distribution. Besides, for some actual sediments in the excess-water setting, hydrate distribution may be not the key factor of the effective thermal conductivity changes, and further studies were required. This research could offer some valuable reference to the thermal properties in the actual sediments.
机译：水合物分布对实际水合物沉积物的有效导热性变化的影响是不确定的。为了定义这种效果，在轴承的石英砂中，通过瞬态热线方法测量有效的导热率，通过电阻变化分析水合物分布。首先，研究了气体饱和，气体压力，水饱和度，水压和温度的有效导热性变化。之后，在三种水合物形成过程中，与水合物分布相比，分析了五种测量点处的有效导热率的变化趋势。结果表明，随着气体饱和度降低，水饱和度或水压力增加，并略微受气体压力和温度略微冲击，结果表明，随着气体饱和度或水压略微冲击，增加了有效的导热率。此外，在五个测量点，非均匀的水合物分布在水合物形成期间引起了有效导热率的不同变化趋势。在过量的水环境中，在一些局部测量点仅观察到越来越大的趋势。大多数测量点的趋势降低受到降低的水分布。但在过量气体环境中，在大多数测量点，观察到这种增加的趋势并通过扩大的水合物分布控制。此外，对于过量水环境中的一些实际沉积物，水合物分布可能不是有效导热性变化的关键因素，并且需要进一步的研究。该研究可以对实际沉积物中的热性质提供一些有价值的参考。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121289.1-121289.12|共12页
  • 作者

    Juan He; Xiaosen Li; Zhaoyang Chen; Changyu You; Kefeng Yan; Zhiming Xia; Qingping Li;

  • 作者单位

    Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Gas Hydrate Chinese Academy of Sciences Guangzhou 510640 China University of Chinese Academy of Sciences Beijing 100049 PR China;

    Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Gas Hydrate Chinese Academy of Sciences Guangzhou 510640 China Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 China State Key Laboratory of Natural Gas Hydrates CNOOC Research Institute Beijing 100028 China;

    Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Gas Hydrate Chinese Academy of Sciences Guangzhou 510640 China Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 China State Key Laboratory of Natural Gas Hydrates CNOOC Research Institute Beijing 100028 China;

    Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Gas Hydrate Chinese Academy of Sciences Guangzhou 510640 China University of Chinese Academy of Sciences Beijing 100049 PR China;

    Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Gas Hydrate Chinese Academy of Sciences Guangzhou 510640 China Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 China;

    Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Gas Hydrate Chinese Academy of Sciences Guangzhou 510640 China Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 China;

    State Key Laboratory of Natural Gas Hydrates CNOOC Research Institute Beijing 100028 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrate distribution; Water saturation; Gas saturation; Hydrate formation; Electrical resistance; Effective thermal conductivity;

    机译：水合物分布;水饱和;气体饱和度;水合物形成;电阻;有效的导热系数;

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