Methane Hydrate Formation and Dissociation in Porous Media Formed in a Synthetic Capillary Tube

Abstract

Abstract:

Formation of gas hydrates in subsea sediment is closely related to the prosperities of the host formation, including grain size, porosity, mineral composition, which have significant impacts on hydrate nucleation and growth. In this paper, formation and dissociation of methane hydrates in sediment is simulated using a synthetic capillary filled with different sand particles. The results of Raman spectroscopy test and observation under a microscope show that hydrates can nucleate both in gasliquid interface and in liquid from the dissolved CH₄, but hydrates give priority to gas-liquid and solidliquid interface for their nucleation, and then grow rapidly. Hydrates in 39 μm to 53 μm compared to clay-grade quartz sand have a better chance of nucleation. And usually hairline hydrates crystals attach to the surface of sediment grains.

Key words: methane hydrate, sediment, synthetic capillary, experimental study

CLC Number:

TE122.1

CHEN Min, YE Yu-Guang, LV Wang-Jun, LIU Chang-Ling, IE Xi-Nong,. Methane Hydrate Formation and Dissociation in Porous Media Formed in a Synthetic Capillary Tube[J]. Geoscience, 2010, 24(3): 632-637.

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