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A Numerical Study on the Effect of Fluid-Rock Reaction during Enhanced Geothermal System Heat Extraction Processes
Received date: 2015-09-06
Revised date: 2015-11-23
Online published: 2016-02-28
The enhanced geothermal system (EGS) circulates heat transfer fluid in the fracture network in the heat reservoir to extract heat from earth-deep hot dry rocks. During EGS operation, the heat transfer fluid may react with the rock in the heat reservoir. The dissolution/deposition of rock minerals dynamically changes the structure and morphology of fracture network in the reservoir, affecting the heat extraction process. This paper analyzes the characteristics of fluid-rock reaction in EGS reservoir, and details the method of coupling the fluid-rock reaction with thermo-fluid flow in porous medium, an equivalent model to the fractured rock reservoir. A Thermal-Hydraulic-Chemical (THC) model is established upon a previous numerical model developed by our group for heat and mass transport during EGS heat extraction processes. The new model is employed to study the long-term heat extraction process with respect to a quintuplet EGS (one injection well plus four production wells). Only interactions between water and calcite are considered in the simulation. The simulation result indicates the setting of injection temperature and mineral concentrations is crucial. If the two conditions cannot reach equilibrium state, the permeability and porosity around injection well will continually change, which will significantly change affect the flow resistance of EGS reservoir.
CHEN Ji-liang , HUANG Wen-bo , CAO Wen-jiong , JIANG Fang-ming . A Numerical Study on the Effect of Fluid-Rock Reaction during Enhanced Geothermal System Heat Extraction Processes[J]. Advances in New and Renewable Energy, 2016 , 4(1) : 48 -55 . DOI: 10.3969/j.issn.2095-560X.2016.01.008
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