海域メタンハイドレートガス開発の経済性及びCO_2排出量評価  [in Japanese] Evaluation of Economics and CO_2 Emission for Developing Offshore Methane Hydrate Deposit  [in Japanese]

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Author(s)

    • 河田 裕子 KAWATA Yuko
    • 東京大学大学院 工学系研究科 地球システム工学専攻 Graduate School of Engineering, Department of Geosystem Engineering, University of Tokyo
    • 藤田 和男 FUJITA Kazuo
    • 東京大学大学院 工学系研究科 地球システム工学専攻 Graduate School of Engineering, Department of Geosystem Engineering, University of Tokyo
    • 増田 昌敬 [他] MASUDA Yoshihiro
    • 東京大学大学院 工学系研究科 地球システム工学専攻 Graduate School of Engineering, Department of Geosystem Engineering, University of Tokyo
    • 松橋 隆治 MATSUHASHI Ryuji
    • 東京大学大学院 新領域創成科学研究科 環境学専攻 Graduate School of Frontier Sciences, Institute of Environmental Studies, University of Tokyo

Abstract

For offshore methane hydrate deposit, we constructed a conceptual production system model incorporated with the software named QUE$TOR, and a model for direct and indirect CO_2 emission assessment by reference to the induced CO_2 emission data from the 1995 inter-industry relations table for environment analysis. Based on the calculated data, we evaluated economics and CO_2 emission in the gas production from a hypothetical offshore hydrate deposit. The three production methods were evaluated! Depressurization using vertical wells; depressurization using horizontal wells! and hot-water injection using horizontal wells. The gas production cost was evaluated to be 818 and 53 Yen/Sm^3 for the depressurization method using vertical and horizontal wells respectively, and 67 Yen/Sm^3 for the hot-water injection method. In regard to CO_2 emission, the depressurization method yielded 66.51 g-C/Mcal for the vertical-well case and 58.43 g-C/Mcal for the horizontal-well case. These values were lower than the reported value for LNG (69.77 g-C/Mcal). The case of hot-water injection emitted more CO_2 at 79.59 g-C/Mcal, but it was lower than the value for oil (83.63 g-C/Meal). This study demonstrated that the depressurization using horizontal wells was most promising method from economical and environmental concerns, but its production cost is much higher than the domestic natural-gas supply price. For utilizing offshore methane hydrates as an economically feasible .resource, the research and development are required in the following area: (1) Completing well with a horizontal section exceeding 1,000 m at a shallow depth under deep water; and (2) Cost reduction in offshore well completion and production system. Moreover, gas productivity from offshore methane hydrates must be evaluated more rigorously from field production tests and simulation studies.

Journal

  • Journal of the Japan Institute of Energy

    Journal of the Japan Institute of Energy 82(4), 197-207, 2003-04-20

    The Japan Institute of Energy

References:  14

Cited by:  4

Codes

  • NII Article ID (NAID)
    110004083278
  • NII NACSIS-CAT ID (NCID)
    AN10373883
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09168753
  • NDL Article ID
    6568084
  • NDL Source Classification
    ZP27(科学技術--化学・化学工業--燃料)
  • NDL Call No.
    Z17-119
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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