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研究論文:Development of methane hydrate production method(長尾)−95−Synthesiology Vol.5 No.2(2012)permeability of 26 mDTerm1, hydrate saturation of 60 % and water saturation of 40 %. From these results, gas production shows a peak during the first period, indicating that mass transfer is predominant in the dissociation process. Gas production experiments conducted using depressurization to ascertain the relationship between the degrees of reduction in pressure and the gas production rate have been underway. The obtained results will be compared with those obtained from a numerical simulation study conducted using the MH21-HYDRES production simulator. This study will contribute to the first field production test to be conducted off the shore of Japan in FY 2012.AcknowledgementsThis study was financially supported by the Research Consortium for Methane Hydrate Resources in Japan (MH21 Research Consortium) to carry out the Methane Hydrate R&D Program conducted by METI. I thank Dr. Hideo Narita, Dr. Yoshihiro Konno, and Dr. Hiroyuki Oyama of AIST for their valuable suggestions in the preparation of this manuscript.020004000600080001000012000140000100200300400500600700800Time (min)Time (min)200150100500200150100500Cumulative gas production (L)Cumulative water production (L)Gas production rate (L/min)Water production rate (L/min)Cum.RateCum.Rate020406080100120140051015202530354045(a) Gas production behaviour(b) Water production behaviourFig. 6 Predictions of gas and water productions based on depressurization experiments in the large-scale laboratory reactor using the MH21-HYDRES production simulatorA peak during the first period in gas production behaviour indicates that mass transfer is predominant in the dissociation process.M. Satho: Distribution and resources of marine natural gas hydrates around Japan, Proc. 4th Int. Conf. Gas Hydrate, 175 (2002).F. Colwell, R. Matsumoto and D. Reed: A review of the gas hydrates, geology, and biology of the Nankai Trough, Chemical Geology, 205, 391 (2004).Bottom simulating reflector (BSR) is observed in seismic profile data, which broadly mimics the relief of the sea floor. This boundary is to mark the pressure and temperature dependent base of the methane-hydrate stability field. Namely, above the BSR, methane hydrate exists as hydrate.M. Kida, K. Suzuki, T. Kawamura, H. Oyama, J. Nagao, T. Ebinuma, H. Narita, H. Suzuki, H. Sakagami and N. Takahashi: Characteristics of natural gas hydrates occurring in pore spaces of marine sediments collected from the eastern Nankai Trough, off Japan, Energy & Fuels, 23, 5580 (2009).E. D. Sloan: Clathrate Hydrates of Natural Gases, 2nd ed., Marcel Dekker (1998).M. Kurihara, A. Sato, H. Ouchi, H. Narita, Y. Masuda, T. Saeki and T. Fujii: Prediction of gas productivity from Eastern Nankai Trough methane-hydrate reservoirs, Offshore Technology Conference, SPE international, Society of Petroleum Engineers, OTC-19382 (2008).M. H. Yousif, P. M. Li, M. S. Selim and E. D. Sloan: Depressurization of natural gas hydrates in Berea sandstone cores, Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 8, 71 (1990).Y. Kamata, T. Ebinuma, R. Omura, H. Minagawa and H. Narita: Decomposition behaviour of artificial methane hydrate sediment by depressurization method, Proc. 5th Int. Conf. Gas Hydrate, 3016 (2005).T. J. Kneafsey, L. Tomutsa, G. J. Moridis, Y. Seol, B. M. Freifeld, C. E. Taylor and A. Gupta: Methane hydrate formation and dissociation in a partially saturated core-scale sand sample, Journal of Petroleum Science & Engineering, 56, 108 (2007).H. Oyama, Y. Konno, Y. Masuda and H. Narita: Dependence of depressurization-induced dissociation of methane hydrate bearing laboratory cores on heat transfer, Energy & Fuels, 23, 4995 (2009).Detail and research planning of the Japan’s Methane Hydrate Research and Development Program and research scheme of Research Consortium for Methane Hydrate Resources in Japan (MH21 Research Consortium) are described at http://www.mh21japan.gr.jp/english/. Y. Konno, Y. Masuda, Y. Hariguchi, M. Kurihara and H. Ouchi: Key Factors for Depressurization-Induced Gas Production from Oceanic Methane Hydrates, Energy & Fuels, 24, 1736 (2010).H. Oyama, J. Nagao, K. Suzuki and H. Narita: Experimental Analysis of Sand Production from Methane Hydrate Bearing Sediments Applying Depressurization Method, J. MMIJ, 126, 497-502 (2010) (in Japanese).Y. Konno, H. Oyama, J. Nagao, Y. Masuda and M. Kurihara: Numerical Analysis of the Dissociation Experiment of Naturally Occurring Gas Hydrate in Sediment Cores Obtained at the Eastern Nankai Trough, Japan, Energy & Fuels, 24, 6353 (2010).[1][2][3][4][5][6][7][8][9][10][11][12][13][14]ReferencesDarcy (D): a traditional unit for permeability. The SI unit for pearmeability is m2. 1D is ca. 10-12 m2.Term 1.Terminology

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