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Title:: Application of Chemical Stimulation Technology in Enhanced Geothermal System: Theory, Practice and Expectation

Author(s):: LIU Ming-liang; ZHUANG Ya-qin; ZHOU Chao; ZHU Ming-cheng; ZHANG Can-hai; ZHU Yong-qiang; TAN Long; LUO Jin; GUO Qing-hai; 1. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China;2. School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China;3. Huanghe Hydropower Development Co., Ltd., State Power Investment Corporation, Xining 810008, Qinghai, China; 4. Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China

Keywords:: enhanced geothermal system; chemical stimulation; reservoir reform; mud acid; retarded acid; chelating agent; hot dry rock; hydrofracture

Abstract:: As a clean and renewable energy, hot dry rocks are the most potential part of exploiting and utilizing in the future, and the engineering technology of exploiting hot dry rock is called enhanced geothermal system. As a supplementary method of hydrofracture, chemical stimulation technology has the characteristics of low cost and risk, and plays a very important role in optimizing reservoir reform. Some related literatures at home and abroad about chemical stimulation technology in enhanced geothermal system (EGS) were reviewed, and the theoretical basis of chemical stimulation technology and several common chemical stimulants (conventional acid, retarded acid, chelating agent and CO₂chemical stimulants) were presented. In addition, the only EGS projects (Fenton Hill in America and Soultz in France) applying chemical stimulation technology in the world were introduced and summarized. On this basis, several suggests and expectations about chemical stimulation in EGS were also proposed, hoping to provide a reference for the scientific research and project implementation of EGS in China.