Natural Gas Geoscience >

2013 , Vol. 24 >Issue 2: 265 - 272

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.02.265

Formation Reaction Characteristics of Methane Hydrate in Different Granular Media

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  • 1.State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental andEngineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;2.School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China

Received date: 2012-04-13

  Revised date: 2012-06-04

  Online published: 2013-04-10

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Abstract

Methane hydrate was formed in the artificial and the natural media which had half-saturated moisture contents and different particle sizes and pore radiuses,and the artificial was chosen as silica gel powder and the natural was chosen as loess.During the reaction processes,the matrix potential values on different positions in the vertical direction of media were measured by three pF-meter probes.According to the measured values,the water depletion rules in the media caused by the methane hydrate formation reactions were calculated and analyzed and the characteristics of methane hydrate formation reactions in media were then studied.Experimental results show that the physical properties of different media-particle size and pore radius can obviously affect formation reaction characteristics of methane hydrate: the formation reaction process of methane hydrate in loess,complying with natural media properties,is perennial and durative,reversely,that in silica gel powder is ephemeral and uniform;during reaction processes,the formation reaction rate within silica gel powder,artificial medium,keeps constant and that within loess,natural medium,slows down as reaction progressing;because methane gas was injected into substrate through reaction cell top,methane diffuses into top layer of substrate fastest and the hydrate formation reaction rate within there was slightly faster than those in both middle and bottom layers;undergoing the same conditions for methane hydrate formation,final water conversion rate in loess is slightly higher than that in silica gel powder.The above comparing result analyses also bring some reference values in geological aspect to us. 

Key words： Methane hydrate; Formation reaction; Moisture; Particle properties; Porous media

Cite this article

ZHANG Peng,WU Qing-bai,JIANG Guan-li,DONG Lan-feng . Formation Reaction Characteristics of Methane Hydrate in Different Granular Media[J]. Natural Gas Geoscience, 2013 , 24(2) : 265 -272 . DOI: 10.11764/j.issn.1672-1926.2013.02.265

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