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The Coso/EGS Concept. Wellbore stimulation produces permeability enhancements through a combination of hydraulic, thermal and chemical effects.First order effects are hydraulic and thermal.Fractures re-open through shear failure.Fractures that fail in shear are self-propping.Second order effects are thermal and chemical.Fracture apertures increase due to rock thermal contraction.Fracture apertures change due to mineral dissolution and/or precipitation.These concepts can be extended to ot9444

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