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Numerical simulation of temperature field in crack of supercritical carbon dioxide fracturing
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-02-26 , DOI: 10.1002/ese3.653 Yi Zhou 1 , Hongjian Ni 1 , Zhonghou Shen 1 , Wenpeng Wang 2 , Meishan Wang 3
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-02-26 , DOI: 10.1002/ese3.653 Yi Zhou 1 , Hongjian Ni 1 , Zhonghou Shen 1 , Wenpeng Wang 2 , Meishan Wang 3
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Supercritical carbon dioxide (SC‐CO2) fracturing technology has far‐reaching application potential for unconventional resources which is beneficial to water protection and CO2 sequestration. In this paper, temperature field in the crack of SC‐CO2 fracturing which will affect flow behavior of SC‐CO2 and the carrying capacity for proppants has been studied. A generalized and pragmatic numerical method coupled with the physical properties model of CO2 and heat and mass transfer in the formation rock has been established to calculate the variations of temperature and density in the crack during fracturing. Porous medium model was used to describe the formation rock which would make the calculation more accurate. Rules of influence distance of the rock with time and injection displacement were analyzed. Distribution of temperature in XY plane is symmetrical, while temperature on the bottom wall is much less than that of the top wall in XZ plane. Decrease in injection temperature and increase in injection displacement will make the temperature of SC‐CO2 lower at the same position which is beneficial to the proppant transportation. Therefore, low injection temperature and high displacement are suggested in the application in order to make a longer proppant bed. Besides, the density of SC‐CO2 is relatively high in the formation of low rock porosity which will make the fracturing more effective. The results obtained in this paper will provide reference for SC‐CO2 fracturing design which could promote the development of this technology.
中文翻译：
超临界二氧化碳压裂裂缝温度场的数值模拟
超临界二氧化碳（SC-CO 2）压裂技术在非常规资源上具有深远的应用潜力，这有利于水保护和CO 2隔离。本文研究了SC-CO 2压裂裂缝中的温度场，该温度场会影响SC-CO 2的流动行为和支撑剂的承载能力。广义实用的数值方法与CO 2物理性质模型的结合已经建立了地层岩石中的传热和传质，以计算压裂过程中裂缝中温度和密度的变化。用多孔介质模型描述了地层岩石，使计算更加准确。分析了岩石影响距离随时间和注入位移的规律。XY平面中的温度分布是对称的，而XZ平面中底壁的温度远小于顶壁的温度。降低注射温度并增加注射排量将使SC‐CO 2的温度下降在同一位置降低，有利于支撑剂的运输。因此，在该应用中建议低注入温度和高排量以制造更长的支撑剂床。此外，SC-CO 2的密度在低孔隙度的形成中相对较高，这将使压裂更加有效。本文获得的结果将为SC-CO 2压裂设计提供参考，可以促进该技术的发展。
更新日期：2020-02-26
中文翻译：
超临界二氧化碳压裂裂缝温度场的数值模拟
超临界二氧化碳（SC-CO 2）压裂技术在非常规资源上具有深远的应用潜力，这有利于水保护和CO 2隔离。本文研究了SC-CO 2压裂裂缝中的温度场，该温度场会影响SC-CO 2的流动行为和支撑剂的承载能力。广义实用的数值方法与CO 2物理性质模型的结合已经建立了地层岩石中的传热和传质，以计算压裂过程中裂缝中温度和密度的变化。用多孔介质模型描述了地层岩石，使计算更加准确。分析了岩石影响距离随时间和注入位移的规律。XY平面中的温度分布是对称的，而XZ平面中底壁的温度远小于顶壁的温度。降低注射温度并增加注射排量将使SC‐CO 2的温度下降在同一位置降低，有利于支撑剂的运输。因此，在该应用中建议低注入温度和高排量以制造更长的支撑剂床。此外，SC-CO 2的密度在低孔隙度的形成中相对较高，这将使压裂更加有效。本文获得的结果将为SC-CO 2压裂设计提供参考，可以促进该技术的发展。
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