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Research paper : Applicability of the technologies to the assessment of methane hydrate sediments (N. TENMA)−226−Synthesiology - English edition Vol.7 No.4 (2015) References[1]MH21 Research Consortium, http://www.mh21japan.gr.jp/english[2]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, SPE Journal, 125481-PA, (2009).[3]U.S. DOE: Fire in the Ice, Methane Hydrate Newsletter, 13 (2), (2013).[4]J. Nagao: Development of methane hydrate production method –A large-scale laboratory reactor for methane hydrate production tests–, Synthesiology, 5 (2), 89-97 (2012).[5]A. Fukada, M. Nakano, Y. Kawamura and T. Matsuda: LNG chika tanku shuhen morido no jishinji chinka yosoku kaiseki (Subsidence prediction analysis during earthquakes of the earth embankment around the underground LNG tanks), Proc. 57th JSCE Annual Conf., 1087-1088 (2002) (in Japanese).[6]K. Aoki, Y. Ogata, A. Masui, J. Mori and K. Hou: Land subsidence due to development of Methane Hydrate, Proc. 2003 MMIJ (A/B), 235-236 (2003) (in Japanese).[7]K. Aoki, Y. Ogata, A. Masui, J. Mori and K. Hou: Numerical analysis of land subsidence due to development of Methane Hydrate, Proc. 2006 MMIJ (Fukuoka), (2006) (in Japanese).[8]M.Y.A. Ng, A. Klar and K. Soga: Coupled soil deformation-flow-thermal analysis of methane production in layered methane hydrate soils, Proc. 2008 Offshore Technol. Conf., OTC19364, (2008). [9]S. Kimoto, F. Oka and T. Fushita: A chemo-thermo-mechanically coupled analysis of ground deformation induced by gas hydrate dissociation, Int. J. of Mechanical Sciences, 52 (2), 365-376 (2010). [10]Y. Sakamoto, M. Kakumoto, K. Miyazaki, N. Tenma, T. Komai, K. Aoki and T. Yamaguchi: Numerical study on consolidation and gas production behavior in a laboratory-scale experiment for dissociation process of methane hydrate by depressurization: Estimation of permeability in methane hydrate reservoir, Part 7, Journal of MMIJ, 126 (12), 631-639 (2010) (in Japanese).[11]K. Miyazaki, Y. Sakamoto, M. Kakumoto, N. Tenma, K. Aoki and T. Yamaguchi: Triaxial compressive properties of artificial methane-hydrate-bearing sediments containing fine fraction, Journal of MMIJ, 127 (9), 565-576 (2011) (in Japanese).[12]J. Yoneda, K. Miyazaki, N. Tenma and M. Hyodo: Prediction of long-term stratal deformation resulting from depressurization for methane hydrate extraction, Proc. 13th Japan Symposium on Rock Mechanics, CD-ROM, JSRM-64 (2012) (in Japanese).[13]M. Kakumoto, J. Yoneda, K. Miyazaki, N. Tenma, A. Masui, K. Aoki, H. Karasawa and R. Itoi: Preliminary study on well integrity during gas production from methane hydrate sediments, Proc. Int. Symp. Earth and Technol. 2011, CD-ROM (2011). [14]A. Masui, H. Haneda, Y. Ogata and K. Aoki: Effects of methane hydrate formation on shear strength of synthetic methane hydrate sediments, Proc. 15th Int. Offshore and Polar Eng. Conf., 364-369 (2005). [15]A. Masui, K. Miyazaki, H. Haneda, Y. Ogata, and K. Aoki: Mechanical characteristics of natural and artificial gas hydrate bearing sediments, Proc. 6th Int. Conf. on Gas Hydrates, CD-ROM, (2008). [16]K. Miyazaki, A. Masui, K. Aoki, Y. Sakamoto, T. Yamaguchi and S. Okubo: Strain-rate dependence of triaxial compressive strength of artificial methane-hydrate-bearing sediment, Int. J Offshore and Polar Eng., 20, 256-264 (2010). [17]K. Miyazaki, A. Masui, Y. Sakamoto, K. Aoki, N. Tenma and T. Yamaguchi: Triaxial compressive properties of artificial methane-hydrate-bearing sediment, J. Geophys. Res., 116 (B6), 102 (2011). [18]K. Miyazaki, Y. Endo, N. Tenma and T. Yamaguchi: A nonlinear viscoelastic constitutive equation for artificial methane hydrate-bearing sand under triaxial compression, Proc. 8th Int. Conf. on Gas Hydrates, CD-ROM, (2014).[19]J. Yoneda, A. Masui, N. Tenma and J. Nagao: Triaxial testing system for pressure core analysis using image processing technique, Rev. Sci. Instrum., 84, 114503 (2013).[20]N. Tenma, K. Miyazaki, J. Yoneda, M. Kakumoto, K. Aoki, J. Mori, A Takiguchi and K. Hou: Sensitivity analysis for well integrity during gas production from methane hydrate sediments, Proc. 3th Comprehensive Symposium on Methane Hydrate (CSMH-3 2011), 55-56 (2011) (in Japanese).[21]M. Kakumoto, J. Yoneda, K. Miyazaki, N.Tenma, K. Aoki and R. Itoi: Basic study on the frictional strength between the casing and cement in a methane hydrate production well, Journal of MMIJ, 129 (4), 116-123 (2013) (in Japanese).[22]J. Yoneda, M. Kakumoto, K. Miyazaki, J. Katagiri, N. Tenma and K. Aoki: Effect of surface roughness on frictional strength of casing in the sand under high confining pressures –Basic studies of well stability for methane hydrate development (Part 2)–, Journal of MMIJ, 129 (6), 278-283 (2013) (in Japanese).[23]J. Katagiri, J. Yoneda and N. Tenma: DEM simulation for evaluating the contact behavior between soil with solid, Proc. 4th Comprehensive Symposium on Methane Hydrate (CSMH-4 2012), 207-208 (2012) (in Japanese).[24]E. Ogisako, S. Nishio and A. Denda: Case study on ground deformation in methane hydrate production, Proc. 4th Comprehensive Symposium on Methane Hydrate (CSMH-4 2012), 136-140 (2012) (in Japanese).[25]N. Yokoyama, M. Hyodo, Y. Nakata, N. Yoshimoto and A. Kato: Triaxial shear characteristics of methane hydrate bearing sand simulated sediments of deep seabed in Nankai Trough, Proc. 4th Comprehensive Symposium on Methane Hydrate (CSMH-4 2012), 145-149 (2012) (in Japanese).[26]Y. Konno, Y. Jin and J. Nagao: Study on enhanced methane hydrate recovery by using high pressure giant unit for methane hydrate analyses (HiGUMA), Proc. 5th Comprehensive Symposium on Methane Hydrate (CSMH-5 2013), 54-55 (2013) (in Japanese).AcknowledgementsThis study was financially supported by the Research Consortium for Methane Hydrate Resources in Japan (MH21 Research Consortium) in the Japan research. By further understanding the mechanical y to continue mechanical behavior. In this paper, I am thankful to the members of the Reservoir Simulator Team, including researchers Dr. Jun Yoneda, Dr. Jun Katagiri, and Dr. Kuniyuki Miyazaki, as well as the people of MH21.

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