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The latest study of Massachusetts Institute of Technology "The Future of Geothermal Energy – Impact of Enhanced Geothermal Systems (EGS) on the United States in the 21st Century" (2006) points out the essential importance of developing an economical deep geothermal boring technology. With current boring technologies, bore price rises exponentially with depth. Thus, finding a boring technology with which the bore price rise would be approximately linear with increasing bore depth is an important challenge. ==New drilling technologies requirements== This MIT study characterizes the requirements on new fast and ultra-deep boring technology as follows: *the price of boring rises linearly with depth *bore axis with neutral floating *the possibility to make vertical or inclined bores up to 10 km deep *the possibility to make large diameter bores – even 5 times larger than on the ground compared to today drilling technologies *casing formed on site in the borehole 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「New drilling technologies」の詳細全文を読む スポンサード リンク
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