Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Study on methane hydrate production using depressurization method

감압법을 이용한 메탄 하이드레이트 생산에 대한 연구

  • Park, Sung-Seek (Dept. of Nuclear & Energy Engineering, Jeju National University) ;
  • Kim, Nam-Jin (Dept. of Nuclear & Energy Engineering, Jeju National University)
  • 박성식 (제주대학교 대학원 에너지공학과) ;
  • 김남진 (제주대학교 에너지공학과)
  • Published : 2010.02.28
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Abstract

Gas hydrates are solid solutions when water molecules are linked through hydrogen bonding and create host lattice cavities that can enclose many kinds of guest(gas) molecules. There are plenty of methane(gas) hydrate in the earth and distributed widely at offshore and permafrost. Several schemes, to produce methane hydrates, have been studied. In this study, depressurization method has been utilized for the numerical model due to it's simplicity and effectiveness. IMPES method has been used for numerical analysis to get the saturation and velocity profile of each phase and pressure profile, velocity of dissociation front progress and the quantity of produced gas. The values calculated for the sample length of 10m, show that methane hydrates has been dissolved completely in approximately 223 minutes and the velocity of dissociation front progress is 3.95㎝ per minute. The volume ratio of the produced gas in the porous media is found to be about 50%. Analysing the saturation profile and the velocity profile from the numerical results, the permeability of each phase in porous media is considered to be the most important factor in the two phase flow propagation. Consequently, permeability strongly influences the productivity of gas in porous media for methane hydrates.

Keywords

References

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