著者

長縄 成実

出版者

石油技術協会

雑誌

石油技術協会誌 (ISSN:03709868)

巻号頁・発行日

vol.82, no.5, pp.324-331, 2017 (Released:2019-05-15)

参考文献数

26

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Although ultra-deep and ultra-high-temperature drilling projects such as Kola superdeep borehole, German KTB project and Kakkonda WD-1a deep geothermal drilling were implemented in the past, such challenging drilling projects seemed to disappear for the last 10 to 20 years. In this paper, the past ultra-deep and ultra-high-temperature drilling projects and the associated technology developments, and the national project on supercritical geothermal system development just started this year are overviewed.