奥会津地熱系の生産管理と資源量評価(<特集>地熱利用技術の研究開発最前線)

概要

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Since 1995, Okuaizu Geothermal Co., Ltd. has provided geothermal steam for the Yanaizu-Nishiyama Geothermal Power Station of Tohoku Electric Power Co., Inc. The installed power plant capacity is 65MW and during 13 years, it has produced an average of 45.6MW electricity means of a calendar calculation. The total amount of produced steam and water reaches 51 million tones (457t/h) and 6 million tones (54t/h) respectively. A volumetric estimate of the total amount of heat stored in the reservoir provided an availability of 67MW production during 25 years with 90% possibility by Monte Carlo Method. A reservoir evaluation study of a double porosity model was done after 6 years of production with enthalpy data from 19 production wells. It concluded the necessity of every year make-well for 45MW operation of 20 years more. To assist the sustainability and renewable of the Oku-Aizu Geothermal System, water re-injection into the deepest part of the production area is being continued from 1982. For the management of the production, decline curve analysis method is useful and the trends are distinguished into 5 categories; normal decline, irregular shaped, parabola shaped, increasing and interference trend. In case of the irregular shaped trend and the parabola shaped trend occur, well-bore stimulation method is applied using fresh water and/or hydrochloric acid.
一般社団法人日本エネルギー学会の論文
2008-10-20