Effects of Water–Rock Interaction on the Permeability of the Near-Well Reservoir in an Enhanced Geothermal System

Bo Feng, Zhenpeng Cui, Xiyao Liu, Shuantong Shangguan, Xiaofei Qi and Shengtao Li ()
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Bo Feng: College of Environment and Resources, Jilin University, Changchun 130021, China
Zhenpeng Cui: College of Environment and Resources, Jilin University, Changchun 130021, China
Xiyao Liu: College of Environment and Resources, Jilin University, Changchun 130021, China
Shuantong Shangguan: No. 2 Exploration Team Hebei Bureau of Coal Geological Exploration, Xingtai 054000, China
Xiaofei Qi: No. 2 Exploration Team Hebei Bureau of Coal Geological Exploration, Xingtai 054000, China
Shengtao Li: Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding 071051, China

Energies, 2022, vol. 15, issue 23, 1-18

Abstract: During the operation of an enhanced geothermal system (EGS), the non-equilibrium temperature, pressure, and hydrochemistry caused by fluid injection intensify water–rock interactions, induce the mineral dissolution and precipitation in the reservoir near an injection well (also referred to as the near-well reservoir), and change reservoir permeability, thus affecting continuous and efficient geothermal exploitation. Based on the investigation of the M-1 injection well of the EGS in the Matouying uplift of Hebei Province, China, a THC reactive solute transport model using the TOUGHREACT program was established in this study to explore the mineral dissolution and precipitation laws of the near-well reservoir and their influencing mechanisms on the reservoir porosity and permeability in the long-term fluid injection of this well. As indicated by the results, the dissolution of primary feldspar and chlorite and the precipitation of secondary minerals (mainly dolomite and illite) occurred and water–rock interaction significantly reduced the porosity and permeability of the near-well reservoir in the long-term continuous injection process. Appropriate reduction in the injection flow rate, injection temperature, and the Mg 2+ and K + contents in the injected water can help inhibit the formation of secondary minerals and delay the plugging process of the near-well reservoir.

Keywords: enhanced geothermal system; water–rock interaction; secondary precipitation; reactive solute transport; 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: 2022
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