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Niobrara shale cubes of 20 cm from Colorado were employed to investigate gas and supercritical CO2 injection-induced fracturing in naturally fractured caprocks of deep aquifers/depleted reservoirs and fractured shale reservoirs. Under tri-axial stresses, gas or supercritical CO2 was injected into the center of the cubes to induce fracturing. Real-time pressure and temperature, acoustic wave, pressure...
During the past two decades, hydraulic fracturing has significantly improved oil and gas production from shale and tight sandstone reservoirs in the United States and elsewhere. Considering formation damage, water consumption, and environmental impacts associated with water-based fracturing fluids, efforts have been devoted to developing waterless fracturing technologies because of their potential...
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