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研究論文:Development of methane hydrate production method(長尾)−97−Synthesiology Vol.5 No.2(2012)permeability of 10 mD order, the mass and heat transfers become comparable at the sample size of 0.5 m (Konno et al. Proc. Offshore Technology Conference 2010, 20591 (2010)). On the basis of the study and the analysis, we have judged that mass transfer dominates the dissociation process with an apparatus of over 1m-size. We have added the explanation in lines 3-8 on page 93 and reference No.15.2. On designing the apparatus, we have set the most important R&D issues to be investigating the dependence of productivity of the depressurization method on the permeability of the sample and finding the most suitable depressurization conditions, and analyzing quantitatively the impact of sand production, skin formation, and flow obstructions. The explanation of the functions prepared to clear the issues, their technological issues and the ways to clear the issues have been added to the manuscript.3. It was described in a paper that the objective of the SUGAR Project is to clarify the characteristics of CO2 geological storage and that the apparatus was introduced to carry out the methane hydrate decomposition using the reaction heat generated in the formation of CO2 hydrate. The explanation of the objective has been added to this manuscript. However, the author has not obtained the accurate information on the design concept of the apparatus and cannot explain it.

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