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- W2732551421 abstract "Massive quantities of fluid are injected into the subsurface during the creation of an engineered geothermal system (EGS) to induce shear fracture for enhanced reservoir permeability. In this numerical thermoelasticity study, we analyze the effect of cold fluid injection on the reservoir and the resulting thermal stress change on potential shear failure in the reservoir. We developed an efficient methodology for the coupled simulation of fluid flow, heat transport, and thermoelastic stress changes in a fractured reservoir. We performed a series of numerical experiments to investigate the effects of fracture and matrix permeability and fracture orientation on thermal stress changes and failure potential. Finally, we analyzed thermal stress propagation in a hypothetical reservoir for the spatial and temporal evolution of possible thermohydraulic induced shear failure. We observe a strong influence of the hydraulic reservoir properties on thermal stress propagation. Further, we find that thermal stress change can lead to induced shear failure on nonoptimally oriented fractures. Our results suggest that thermal stress changes should be taken into account in all models for long-term fluid injections in fractured reservoirs." @default.
- W2732551421 created "2017-07-14" @default.
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- W2732551421 date "2017-01-01" @default.
- W2732551421 modified "2023-10-18" @default.
- W2732551421 title "On the Role of Thermal Stresses during Hydraulic Stimulation of Geothermal Reservoirs" @default.
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- W2732551421 doi "https://doi.org/10.1155/2017/4653278" @default.
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