Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8088672 | Geothermics | 2018 | 20 Pages |
Abstract
Sustaining a network of connected fractures is critical to the long-term success of Enhanced Geothermal Systems (EGS). In this study, the effects of coupled Thermal-Hydrological-Mechanical-Chemical (THMC) processes on fracture aperture and permeability were examined by conducting a series of flow-through experiments on artificially-fractured granite specimens at effective stresses of 5 MPa to 36 MPa, rock temperatures of 25 °C and 130 °C, and injected fluid temperatures of 25 °C, 75 °C, and 130° C. The higher fracture closure rates observed at higher effective stresses and the incomplete recovery of fracture permeability and hydraulic aperture observed during unloading stages highlight the role of pressure solution. The increase in temperature of the injected fluid increases the recovery percentage of fracture aperture and permeability after unloading.
Related Topics
Physical Sciences and Engineering
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Geochemistry and Petrology
Authors
Arash Kamali-Asl, Ehsan Ghazanfari, Nicolas Perdrial, Nicholas Bredice,