Longjun Dong, Seun A. Ajayi, Qiaomu Luo, Zixin Huang
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Fracture Deformation and Thermal Performance of Sc-CO2, Water, and Brine Water in Dual-Porosity Dual-Permeability Geothermal System
The physical and thermal behaviours of supercritical CO2 (Sc-CO2), brine water, acidic water, and freshwater as geothermal fluids were numerically investigated to provide better insights into their performance in enhanced geothermal systems (EGSs). First, we analyzed the hydrogeochemical (diffusive) characteristics of the fluids resulting from density changes within the reservoirs. We then performed a coupled thermo-hydro-mechanical (THM) analysis to investigate the fracture deformation and heat production performance. The study shows that the induced fracture deformation at the injection and production wells by Sc-CO2 is less than that of the other geofluids; however, it has the highest thermal performance. This makes Sc-CO2 a less viable fluid for hydraulic stimulation in EGS production. The magnitude of the fluid-induced deformation in the injection zone was significantly higher than that in the production zone. The rock matrix saturation time by acidic water is the least; the increased residence time within the rock matrix could increase the thermal performance relative to fluids of similar thermophysical properties.
期刊介绍：
Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines.
Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.
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