1. College of Construction Engineering, Jilin University, Changchun 130026, China
2. Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun 130026, China
3. Key Laboratory of Drilling and Exploration Technology in Complex Conditions of Ministry, Natural Resources, Jilin University, Changchun 130026, China
4. Department of Electrical Engineering and Energy Technology, University of Vaasa, P.O. Box 700, 65101 Vaasa, Finland
5. Department of Civil Engineering, Aalto University, P.O. Box 12100, 02130 Espoo, Finland