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AE monitoring of hydraulic fracturing experiments conducted using CO_2 and water

机译：使用CO_2和水进行水力压裂实验的AE监控

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Use of carbon dioxide (CO_2) as a fluid for hydraulic fracturing has been considered to stimulaternoil production, to enhance shale gas recovery and to extract hot dry rock geothermal energy. In these projects,rnCO_2 is usually injected into rocks at a depth more than 1,000 m. In the temperature and pressure at that depthrnCO_2 usually becomes a supercritical state (SC-CO_2), and viscosity of the SC-CO_2 is very low around 5% of thatrnof water. So, it is important to understand the behavior of SC-CO_2 in rock. Thus, we made hydraulic fracturingrnexperiments using SC-CO_2 and water in two granite specimens for each fracturing fluid under a true tri-axialrnloading condition. The results of the experiments suggested that low viscosity fluid like SC-CO_2 is expectedrnto induce more three dimensionally and widely spreading cracks under considerably lower breakdown pressurernthan water.
机译：人们已经考虑使用二氧化碳（CO_2）作为水力压裂的流体，以刺激生成扁桃石，提高页岩气的采收率并提取热的干燥岩石地热能。在这些项目中，通常将rnCO_2注入深度超过1,000 m的岩石中。在该深度的温度和压力下，CO_2通常变为超临界状态（SC-CO_2），并且SC-CO_2的粘度非常低，约为那那水的5％。因此，了解SC-CO_2在岩石中的行为很重要。因此，我们在真正的三轴加载条件下，使用SC-CO_2和水在两个花岗岩试样中对每种压裂液进行了水力压裂试验。实验结果表明，在比水低得多的击穿压力下，像SC-CO_2这样的低粘度流体有望引发更多的三维裂纹。

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