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首页> 外文期刊>Energy & fuels >Microscale Experiment and Pore-Network Modeling Analysis of Growth Habit, Pore Structure, and Permeability of Hydrate-Bearing Sediments
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Microscale Experiment and Pore-Network Modeling Analysis of Growth Habit, Pore Structure, and Permeability of Hydrate-Bearing Sediments

机译:生长习性,孔隙结构和水合物沉积物渗透性的微观实验和孔隙网络建模分析

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摘要

Pore structure properties of hydrate-bearing sediments considerably affect fluid flow properties during gas production from natural gas hydrate reservoirs. Hence, it is important to investigate the evolution of pore structure characteristics and fluid flow properties in hydrate-bearing sediments under various conditions. In this study, the effects of particle size and hydrate saturation on hydrate growth habits, pore structure properties, and permeability reduction have been analyzed via microscale experiments (using X-ray computed tomography) and pore-network models. Experimental results reveal the pore-habit evolution of gas hydrate from grain-enveloping to pore-filling, as well as the homogeneous distribution of gas hydrate in pores with the increase in hydrate saturation and the decrease in particle size. It is noteworthy that the pore structure characteristics of hydrate-bearing sediments depend on the pore interconnectivity. The pore interconnectivity is closely related to hydrate saturation. Specifically, the volume of non-interconnected pore (dead-end pore first increases and then decreases with the increase in hydrate saturation. However, the pore interconnectivity appears to be less influenced by the hydrate occurrence for small particle sizes. Based on pore-network modeling results, the exponential distribution of pore volume and the normal distribution of throat channel length have been found. Additionally, the correlated equation of absolute permeability and particle size in the presence of gas hydrate has been first proposed. The prediction accuracy of the absolute permeability equation has been validated by experimental results in this work and experimental measurements from previous studies. These results provide valuable information and data for efficient and economic gas production from hydrate-bearing sandy or silt sediments of submarine.
机译:轴承沉积物的孔隙结构性质在天然气水合物储存器中产生的气体生产过程中的流体流动性能显着影响。因此,重要的是在各种条件下研究水合物沉积物中孔隙结构特征和流体流动性能的演变。在本研究中,通过微尺度实验(使用X射线计算机断层扫描)和孔网络模型,分析了粒度和水合物饱和对水合物生长植物,孔隙结构性能和渗透性降低的影响。实验结果揭示了气体水合物对孔隙填充物的孔血管习惯演化,以及孔隙水合物的均匀分布随水合物饱和度的增加和粒径的降低。值得注意的是,轴承沉积物的孔结构特性取决于孔隙互连。孔隙互连与水合物饱和密切相关。具体地,非互连孔的体积(死端孔首先增加,然后随水合物饱和的增加而降低。然而,孔隙互连似乎受到小粒径的水合物发生的影响较小。基于孔网络已经发现建模结果,已经发现了孔隙体积的指数分布和喉部通道长度的正常分布。另外,已经提出了气体水合物存在下的绝对渗透性和粒度的相关方程。绝对渗透性的预测准确性通过实验结果验证了这项工作的实验结果和先前研究的实验测量。这些结果提供了有价值的信息和来自潜水物的含水砂或淤泥沉积物的有效和经济生产的数据。

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  • 来源
    《Energy & fuels》 |2021年第10期|8773-8785|共13页
  • 作者单位

    Chinese Acad Sci Guangzhou Inst Energy Convers Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Inst Energy Convers Key Lab Gas Hydrate Guangzhou 510640 Peoples R China|Guangdong Prov Key Lab New & Renewable Energy Res Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Ctr Gas Hydrate Res Guangzhou 510640 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Energy Convers Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Inst Energy Convers Key Lab Gas Hydrate Guangzhou 510640 Peoples R China|Guangdong Prov Key Lab New & Renewable Energy Res Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Ctr Gas Hydrate Res Guangzhou 510640 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Energy Convers Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Inst Energy Convers Key Lab Gas Hydrate Guangzhou 510640 Peoples R China|Guangdong Prov Key Lab New & Renewable Energy Res Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Ctr Gas Hydrate Res Guangzhou 510640 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Energy Convers Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Inst Energy Convers Key Lab Gas Hydrate Guangzhou 510640 Peoples R China|Guangdong Prov Key Lab New & Renewable Energy Res Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Ctr Gas Hydrate Res Guangzhou 510640 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Energy Convers Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Inst Energy Convers Key Lab Gas Hydrate Guangzhou 510640 Peoples R China|Guangdong Prov Key Lab New & Renewable Energy Res Guangzhou 510640 Peoples R China|Chinese Acad Sci Guangzhou Ctr Gas Hydrate Res Guangzhou 510640 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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