| Project/Area Number |
07455409
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
資源開発工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MASUDA Yoshihiro The University of Tokyo, School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (50190369)
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| Co-Investigator(Kenkyū-buntansha) |
NAGANAWA Shigemi The University of Tokyo, School of Engineering, Research Assistant, 大学院・工学系研究科, 助手 (10237539)
MIYAZAWA Masashi The University of Tokyo, School of Engineering, Research Assistant, 大学院・工学系研究科, 助手 (30010987)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | hydrate / petroleum engineering / methane / natural gas / equation of state / キセノン |
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| Research Abstract |
The researchers have studied the dissociation behavior of hydrates in sediments by experimental and modeling approach, considering the depressurization technique of gas production from hydrate sediments.
Two experimental apparatuses were constructed. One was designed for measuring formation and dissociation rates of hydrate in a cell. The experiment using xenon gas showed that it took several hours to reach equilibrium state after the start of formation and dissociation of hydrate. The hydrate number of formed xenon hydrate was higher than its theoretical value. Another apparatus was designed for measuring the decrease in gas permeability with hydrate formation in porous media. The change in gas permeability with hydrate saturation was mathematically modeled from the experimental results using a core packed with 710-840 mum glass beads. Although the method for forming hydrate in the core was established, the dissociation rate of hydrate in the core could not be measured because the total pore volume was too small for accurate measurement of gas flow rate.
Regarding to modeling study, a numerical program was developed for predicting phase behavior of methane-water mixture. For predicting gas production performance from porous media containing hydrates, two numerical programs were developed. One was based on phase-equilibrium theory, and another was based on dissociation kinetics of hydrate. From model calculations using these programs, the dissociation behavior of hydrate in a one-dimensional core was studied. The calculations showed that the three factors would affect the dissociation rate of hydrates in sediments : heat conduction from the surroundings ; the dissociation rate of hydrate crystals ; and permeability of sediments.
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