Reactive Transport Modeling of Chemical Stimulation Processes for an Enhanced Geothermal System (EGS)

Li Ma, Zhenpeng Cui, Bo Feng, Xiaofei Qi, Yuandong Zhao and Chaoyu Zhang ()
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Li Ma: Mudanjiang Natural Resources Comprehensive Survey Center of China Geological Survey, Mudanjiang 157021, China
Zhenpeng Cui: Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun 130026, China
Bo Feng: Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun 130026, China
Xiaofei Qi: No. 2 Exploration Team Hebei Bureau of Coal Geological Exploration, Xingtai 054001, China
Yuandong Zhao: Mudanjiang Natural Resources Comprehensive Survey Center of China Geological Survey, Mudanjiang 157021, China
Chaoyu Zhang: Chinese Academy of Natural Resources Economics, Beijing100035, China

Energies, 2023, vol. 16, issue 17, 1-17

Abstract: An enhanced geothermal system is a kind of artificial geothermal system, which can economically exploit geothermal energy from deep thermal rock mass with low permeability by artificially created geothermal reservoirs. Chemical stimulation refers to a reservoir permeability enhancement method that injects a chemical stimulant into the fractured geothermal reservoir to improve the formation permeability by dissolving minerals. In this study, a reactive solute transport model was established based on TOUGHREACT to find out the effect of chemical stimulation on the reconstruction of a granite-hosted enhanced geothermal system reservoir. The results show that chemical stimulation with mud acid as a stimulant can effectively improve the permeability of fractures near the injection well, the effective penetration distance can reach more than 20 m after 5 days. The improvement of porosity and permeability was mainly caused by the dissolution of feldspar and chlorite. The permeability enhancement increased with the injection flow rate and HF concentration in the stimulant, which was weakly affected by the change in injection temperature. The method of chemical enhancement processes can provide a reference for subsequent enhanced geothermal system engineering designs.

Keywords: enhanced geothermal system; chemical stimulation; reactive transport modeling; TOUGHREACT (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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