Experimental Research of Methane Hydrate Phase Transformation in Porous Media

Abstract

Abstract:

The hydrate phase transformation process not only has effect to temperature variation in sediments, but also influences the physical properties of sediments, such as dielectric constants. It is necessary to investigate the hydrate phase transformation for making good use of hydrates resource in the future. In this paper, a welldesigned apparatus was used to study the hydrate formation and dissociation process. The result reveals that hydrate formation is controlled by subcooling degree and gas saturation. When the gas supply is enough, hydrates will be formed more easily in cooler region. Otherwise, it will be synthesized in high gas saturation place. The phase transformation of hydrates will cause the dielectric constant variation of sediments, and through the time domain reflection method, the hydrate saturation can be calculated. The stability of gas hydrate is obviously influenced by thermal stimulation,and the heat transportation efficiency of sediments is a quadratic function to heating source.

Key words: hydrate, porous medium, phase transformation, TDR, saturation

CLC Number:

TE311

CHEN Qiang, YE Yu-Guang, LIU Chang-Ling, DIAO Shao-Bo, ZHANG Jian. Experimental Research of Methane Hydrate Phase Transformation in Porous Media[J]. Geoscience, 2010, 24(5): 972-978.

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Experimental Research of Methane Hydrate Phase Transformation in Porous Media

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