• Jun 20, 2018 News! [CFP] 2018 the annual meeting of IJET Editorial Board, ICEDA 2018, will be held in Nha Trang, Vietnam during October 20-22, 2018.   [Click]
  • Aug 06, 2018 News! Vol.9, No.1- Vol.9, No.4 has been indexed by EI(Inspec)!   [Click]
  • Sep 30, 2018 News!Vol.10, No. 1-No. 6 has been indexed by Crossref.
General Information
Editor-in-chief
Prof. T. Hikmet Karakoc
Anadolu University, Faculty of Aeronautics and Astronautics, Turkey

IJET 2018 Vol.10(5): 408-413 ISSN: 1793-8236
DOI: 10.7763/IJET.2018.V10.1093

Effect of Low-temperature Induction on Heat Mining Performance of EGS in Hot Dry

Wei Zhang, Zhan-qing Qu, and Tian-kui Guo
Abstract—As high temperature in hot dry rocks(HDR), the process of injecting cold fracturing fluid to form fractures and circulating working fluid to extract heat energy from enhanced geothermal system(EGS) all inevitably involve the low-temperature induction imposing on hot dry rocks. Considering the temperature-dependent parameter changes of matrix and fluid, we establish thermal-hydraulic-mechanical full coupling model to investigate the effect of low-temperature induction on heat mining performance of EGS. This paper begins with experimentally study to obtain the possible distribution of sub-fractures in EGS caused by the thermal stress cracking induced by thermal drawdown; Then we discuss the heat mining performance in terms of whether the sub-fractures are considered and whether the thermal stress aroused by low-temperature fluid circulation is taken account during mining process. We find that thermal stress induced by low-temperature circulation brings contraction of matrix and influences seepage capacity of fractures by changing effective stress in EGS mining.

Index Terms—Low-temperature induction, heat mining performance, thermal-hydraulic-mechanical(THM) coupling, hot dry rocks(HDR)

Wei Zhang is with the China University of Petroleum, Upc, CO 266580 China (e-mail: 18562029717@163.com).
Zhan-qing Qu and Tian-kui Guo is with the China University of Petroleum, Upc, CO 266580 China (e-mail: quzhq@upc.edu.cn, guotiankui@126.com)

[PDF]

Cite: Wei Zhang, Zhan-qing Qu, and Tian-kui Guo, "Effect of Low-temperature Induction on Heat Mining Performance of EGS in Hot Dry," International Journal of Engineering and Technology vol. 10, no. 5, pp. 408-413, 2018.

Copyright © 2008-2017. International Journal of Engineering and Technology. All rights reserved. 
E-mail: ijet@vip.163.com