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Conference Papers Year : 2017

Sustainability of Fractured Rock Permeability under Varying Pressure


Sustainable energy production is key for today's energy and heat demand and relies on the successful stimulation of low-permeable oil, gas or geothermal reservoirs. Fracture permeability is a substantial topic in recent laboratory and numerical studies. Our aim is to study the sustainability of fracture permeability at varying effective stress with a focus on the fracture mechanism involved. We aim to further characterize the permeability evolution for different modes, mode I tensile fractures, saw-cut fractures, mode I tensile fractures with shear displacement and mode II shear fractures, in the laboratory, covering all fracture modes commonly observed in EGS. The hydraulic experiments are carried out in a triaxial compression cell. To simulate production and injection procedures in a geothermal reservoir, the effective pressure is varied and permeability is continuously measured. The permeability development of different fracture types at high effective stresses has been investigated and a general decrease of permeability at already low effective stress was observed in all tests. Shearing does not lead to a sustainable permeability increase for the tested sandstone. Conclusively, any reduction in pore pressure after stimulation will damage the fracture permeability irrecoverably.
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hal-03978471 , version 1 (22-02-2023)



C Kluge, G Blöcher, H Milsch, H Hofmann, A Nicolas, et al.. Sustainability of Fractured Rock Permeability under Varying Pressure. 6th Biot Conference on Poromechanics, Jul 2017, Champs-sur-Marne, France. ⟨10.1061/9780784480779.148⟩. ⟨hal-03978471⟩
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