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

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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.
一般社団法人日本エネルギー学会の論文
2003-04-20

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

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