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3D measurements of hydrate surface area during hydrate dissociation in porous media using dynamic 3D imaging

机译：使用动态3D成像技术在多孔介质中水合物分解过程中水合物表面积的3D测量

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摘要

A better understanding of the kinetics of hydrate dissociation is essential to reliably predict gas production potential from natural hydrate reservoirs. Most hydrate dissociation models assume hydrates to be a constant number of equal-sized spheres dissociating at a constant rate. This paper uses dynamic 3D synchrotron micro-computed tomography (SMT) imaging to study hydrate surface area evolution during Xenon hydrate dissociation. Hydrates are formed inside a high-pressure low-temperature cell filled with partially saturated ASTM 20-30 Ottawa sand. Hydrate dissociation is initiated through depressurization in the first experiment and through thermal stimulation in the second experiment. During dissociation, continuous full 3D SMT images were acquired where each scan took 45 s to complete. A combination of cementing, pore-filling, and surface coating pore habits were observed for the depressurization experiment and pore-filling for the thermal stimulation experiment. Surface coating hydrates dissociate faster than hydrates with pore-filling pore habit due to the higher specific area which allows for more surface for hydrates to dissociate it. Direct measurements of hydrate volume and hydrate surface area suggest that even with a combination of hydrate pore habits formed within the 3D porous media, estimation of hydrate surface area as a linear relation with (hydrate volume)(2/3) is best for hydrate saturation less than a threshold value depending on the dissociation method and driving force. (hydrate volume)(2) and (hydrate volume)(3) were found to better estimate hydrate interfacial area in comparison to (hydrate volume)(2/3) for the depressurization experiment and thermal stimulation experiment, respectively.
机译：对水合物分解动力学的更好理解对于可靠地预测天然水合物储层的天然气生产潜力至关重要。大多数水合物解离模型都假定水合物是恒定数量的恒定大小的等尺寸球体。本文使用动态3D同步加速器微计算机断层扫描（SMT）成像研究氙水合物离解过程中水合物表面积的变化。在充满部分饱和的ASTM 20-30渥太华沙的高压低温池内形成水合物。在第一个实验中通过减压和在第二个实验中通过热刺激来引发水合物的离解。在解离期间，获取连续的完整3D SMT图像，每次扫描需要45 s才能完成。在降压实验中观察到胶结，孔隙填充和表面涂层孔隙习惯的组合，在热刺激实验中观察到了孔隙填充。表面涂层水合物的离解速度快于具有孔填充孔隙习惯的水合物，这是因为较高的比表面积允许更多的水合物离解表面。对水合物体积和水合物表面积的直接测量表明，即使在3D多孔介质中形成了水合物孔隙习性的组合，将水合物表面积估算为与（水合物体积）（2/3）的线性关系也最适合于水合物饱和根据解离方法和驱动力，其小于阈值。与减压实验和热刺激实验中的（水合物体积）（2/3）相比，发现（水合物体积）（2）和（水合物体积）（3）可以更好地估计水合物界面面积。

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  • 来源
    《Fuel》 |2020年第1期|116978.1-116978.17|共17页
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  • 作者单位

    Univ Tennessee Dept Civil & Env Engn 325 John Tickle Bldg Knoxville TN 37996 USA;

    Qatar Univ Dept Civil & Architectural Engn POB 2713 Doha Qatar;

    Chungbuk Natl Univ Sch Civil Engn Cheongju 28644 Chungbuk South Korea;

  • 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

    Gas hydrates; Computed tomography; 3D imaging; Dissociation rate; Hydrate pore habit;

    机译：天然气水合物;CT检查;3D成像;离解率;水合毛孔习性;

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