Visual observation of dissociation of methane hydrate crystals in a glass micro model: Production and transfer of methane

Daisuke Katsuki, Ryo Ohmura, Takao Ebinuma, Hideo Narita

研究成果: Article査読

54 被引用数 (Scopus)

抄録

Dissociation of methane hydrate crystals in pore space caused by temperature increase or depressurization, which is one of the main concerns in developing techniques to exploit natural gases in clathrate hydrate in sediments, was observed by using a glass mimic of sediments. Hydrate crystals were formed at a system temperature of T=274.0 K and system pressure of p=12.5 MPa or T=279.6 K and p=10.1 MPa and then decomposed by increasing the system temperature to 289 or 290 K, respectively. Two experimental runs of depressurization were also conducted. Hydrate crystals formed at T=282.9 K and p=10.1 MPa or T=274.0 K and p=12.5 MPa were decomposed by depressurization to 1.7 or 0.5 MPa at a system temperature of 285.5 or 274.3 K. The glass mimic of sediments (glass micromodel) was composed of a quartz glass plate on which straight microchannels were carved and another quartz glass plate covering the microchannels. The microchannels were approximately rectangular in cross section with a top width of 1.0× 102 μm and were arranged in a grid pattern at regular intervals of 2.0× 102 μm. Methane gas released from dissociating methane hydrate crystals was commonly observed to form slugs that completely occupy the pores in all experiment runs. The mechanism of the dissociation of the methane hydrate crystals was discussed considering the heat and mass transfer of methane around the dissociating methane hydrate crystals.

本文言語English
論文番号083514
ジャーナルJournal of Applied Physics
104
8
DOI
出版ステータスPublished - 2008

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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