2023 Fiscal Year Final Research Report
Is Heating Method Unsuitable for Methane Hydrate Production? -Heat and Fluid Transfer Characteristics and Evaluation-
| Project/Area Number |
20K04683
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22030:Geotechnical engineering-related
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| Research Institution | Yamaguchi University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
中田 幸男 山口大学, 大学院創成科学研究科, 教授 (90274183)
梶山 慎太郎 山梨大学, 大学院総合研究部, 助教 (50803532)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | メタンハイドレート / 生産 / 熱 / 地盤 / 流体 / 減圧 / 間隙比 / 粒子破砕 |
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| Outline of Final Research Achievements |
In the case of methane hydrate-bearing sand, it was confirmed that the temperature behavior stagnated or decreased for a certain period of time. During the decomposition of methane hydrate, it was observed that the pore pressure increased. Then, it was confirmed that the amount of methane gas produced increased rapidly at the moment when the increased pore pressure returned to normal.
From the results of the one-dimensional temperature-controlled permeability column tests, it was confirmed that there was no significant difference in the thermal behavior of Toyoura sand and Tc. It was also confirmed that heat transfer was faster in the case of the xenon hydrate-bearing sand. One-dimensional heat transfer analysis considering the heat loss term was performed, and the temperature characteristics of the xenon hydrate-bearing sand during thermal decomposition were generally expressed.
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| Free Research Field |
地盤工学
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| Academic Significance and Societal Importance of the Research Achievements |
加熱法の適用を想定した解析的検討に必要と考えられるハイドレートを含む砂の熱特性や間隙流体の移動特性等について多くの知見を得ることができた．本研究では，境界条件の明確な室内実験のシミュレーションでの検証に留めているが，シミュレーションに必要なパラメータは決定できており，実地盤環境でのシミュレーションも可能といえる．このように，MH資源開発の加熱法による生産に係わる基礎的な研究については，その実現の可能性の目途がついたといえる．ただし，減圧法では確認されなかった挙動が確認されており，実地盤での産出試験において，その挙動が生産に悪影響を与えうるかどうかについて，今後，更なる研究が必要といえる．
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