Journal
GEOTHERMICS
Volume 85, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2019.101771
Keywords
Enhanced geothermal system; Drilling; Hard rock; Field demonstration; Thermal spallation; Acoustic emissions
Categories
Funding
- Swiss Federal Office of Energy [SI/501'658-01]
- Werner Siemens Foundation (Werner Siemens-Stiftung)
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Combined thermo-mechanical drilling is a novel technology to enhance drilling performance in deep hard rock formations. In this work, we demonstrate this technology in the field by implementing the concept on a full-scale drilling rig, and we show its feasibility under realistic process conditions. We provide evidence that the novel drilling method can increase the removal performance in hard rocks by up to a factor of three, compared to conventional drilling methods. From the findings of this work, we conclude that integration of thermal assistance to conventional rotary drilling constitutes an interesting approach to facilitate the drilling process, and therefore increase the access viability to deep georesources in hard rocks.
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