Evolution Process of Natural Gas Hydrate Deposits in Water-Dominated Systems,Energy & Fuels

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Evolution Process of Natural Gas Hydrate Deposits in Water-Dominated Systems
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-08-11 , DOI: 10.1021/acs.energyfuels.2c01505
Xiang Liu _{1,

2,

3} , Kunming Song _{1,

2,

3} , Yuxing Li _{2,

3} , Haiyuan Yao _{1,

4} , Haihong Chen _{1,

4} , Zhigang Li ₄ , Wuchang Wang _{2,

3}

Affiliation

In order to improve the operation safety of the multiphase flow in the subsea pipelines and facilitate the development of deep-sea oil and gas resources, the evolution process of different hydrate deposits has been studied based on high-pressure reactors and focused beam reflectance measurement (FBRM). The results show that larger hydrate formation (6% vt hydrate concentration) can form layered deposits but smaller (3% vt hydrate concentration) corresponding to the suspended slurry, and the reduction rate of the fixed bed thickness is greater than the moving bed. Microscopic images show that the downward transportation of pore water dominates the evolution process when the moisture content is higher than 87%. The evolution mathematical model of hydrate deposit thickness which is based on Darcy’s law is in good agreement with the experimental results, proving the properties of porous media in hydrate deposits. The migration rate and permeability of porous hydrate particles are positively related to the particle size, both showing a linear relationship at the microscopic scale. The deposits with a uniform particle size distribution are more difficult to stratify and thus more suspended, which is conducive to the safety of pipeline transportation compared with the layered deposits. On these bases, the mechanism and mathematical model of hydrate deposit stratification and evolution are established.

中文翻译：

水主导系统中天然气水合物矿床的演化过程

为提高海底管道多相流运行安全，促进深海油气资源开发，基于高压反应堆和聚焦束反射测量研究了不同水合物沉积物的演化过程。 FBRM）。结果表明，较大的水合物形成量（6% vt 水合物浓度）可形成层状沉积物，但较小（3% vt 水合物浓度）对应于悬浮浆液，并且固定床厚度的减少率大于移动床。显微图像显示，当含水率高于 87% 时，孔隙水的向下输运主导演化过程。基于达西定律的水合物沉积层厚度演化数学模型与实验结果吻合较好，证明了水合物沉积层中多孔介质的性质。多孔水合物颗粒的迁移速率和渗透率与粒径呈正相关，在微观尺度上均呈线性关系。粒度分布均匀的沉积物更难分层，因而悬浮性更强，与层状沉积物相比，有利于管道运输的安全。在此基础上，建立了水合物矿床分层演化的机理和数学模型。多孔水合物颗粒的迁移速率和渗透率与粒径呈正相关，在微观尺度上均呈线性关系。粒度分布均匀的沉积物更难分层，因而悬浮性更强，与层状沉积物相比，有利于管道运输的安全。在此基础上，建立了水合物矿床分层演化的机理和数学模型。多孔水合物颗粒的迁移速率和渗透率与粒径呈正相关，在微观尺度上均呈线性关系。粒度分布均匀的沉积物更难分层，因而悬浮性更强，与层状沉积物相比，有利于管道运输的安全。在此基础上，建立了水合物矿床分层演化的机理和数学模型。

更新日期：2022-08-11

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