成果報告書詳細
管理番号20160000000340
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム 超臨界地熱開発実現のための革新的掘削・仕上げ技術の創出
公開日2016/6/22
報告書年度2015 - 2015
委託先名国立大学法人東京大学 国立大学法人東北大学 国立研究開発法人産業技術総合研究所 地熱エンジニアリング株式会社 地熱技術開発株式会社
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies / Creation of Innovative Drilling and Completion Technologies for Realization of Supercritical Geothermal Development (FY2015-FY2016) FY2015 Annual Report

Development of supercritical geothermal system originated in Japan Trench subduction zone is expected to generate terawatt-scale energy and to solve the various problems existing in conventional geothermal systems at a stroke such as site-dependency, sustainability, capacity, scale inhibition, coexistence with national parks and hot springs, and induced seismicity. Although technologies to effectively drill into the deep ductile formation with temperature over 400 degrees Celsius and to complete wells with sufficient integrity are indispensable for supercritical geothermal system development, no human beings have ever experienced resource developments in such a harsh and hostile environment. In this research project, we are aiming to develop a new innovative drilling method using thermal-shock or thermal-stress failure of rock induced by rapid cooling.
Our research project consists of four tasks and the progresses are as follows:
1. Development of a new drilling system using thermal-shock failure of rock induced by decompression, boiling and cooling of drilling fluid bottomohole
Based on the previously proposed decompression drilling concept, Tohoku University group conducted a couple of hydrothermal experiments to obtain various data for modeling the behavior and mechanism of thermal-shock rock failures near wellbore. The University of Tokyo group studied existing downhole tools and simulation technologies to create new methods to locally decompress and cool the bottomhole.
2. Development of wellbore hydrothermal simulation technology applicable to supercritical condition
Geothermal Energy Research & Development (GERD) group evaluated several existing hydrothermal simulator to specify the implementation scheme of coupling with the newly developing supercritical calculation module.
3. Development of “Thermal Expansion Packer”
Geothermal Engineering (GeoE) and Teiseki Drilling group designed and constructed small-size prototypes of thermal expansion packer for evaluation tests to be conducted next fiscal year.
4. Research and development of acid- and corrosion-resistant materials against supercritical environment
National Institute of Advanced Industrial Science and Technology (AIST) group reviewed selection guides of oil country tubular goods (OCTGs) for corrosion environments and vast amount of material evaluation research reports in a past national project for development of new energy technologies, “Sunshine Project.”
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