Huang Fei, Hu Bin
Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology Xiangtan Hunan 411201 China
Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology Xiangtan Hunan 411201 China.
RSC Adv. 2018 Nov 13;8(66):38065-38074. doi: 10.1039/c8ra07480a. eCollection 2018 Nov 7.
This paper focuses on the damage of shale rock impacted by a high-pressure supercritical carbon dioxide (SC-CO) jet. A well-designed apparatus was used to conduct experiments with a high-pressure SC-CO jet impacting shale core plugs. The damage, including the macrofailure and the microchanges of shale samples, was analyzed. The results show that the shale cores develop grid-like fractures on the top surface, while many layered fractures were observed inside the shale cores by means of computed tomography scan. The maximum broken depth of the shale core plugs is dependent upon the combined actions of jet pressure, jet temperature and target distance. The scanning electron microscope images along with the X-ray diffraction results indicate that the shale samples are eroded by the SC-CO jet. This erosion may further lead to the macrodamage of shale samples by reducing their mechanical strength.
本文聚焦于高压超临界二氧化碳（SC-CO₂）射流冲击作用下页岩的损伤情况。采用精心设计的装置对高压SC-CO₂射流冲击页岩岩心塞进行实验。分析了包括页岩样品宏观破坏和微观变化在内的损伤情况。结果表明，页岩岩心顶面出现网格状裂缝，通过计算机断层扫描观察到页岩岩心内部有许多层状裂缝。页岩岩心塞的最大破碎深度取决于射流压力、射流温度和靶距的共同作用。扫描电子显微镜图像以及X射线衍射结果表明，页岩样品受到SC-CO₂射流的侵蚀。这种侵蚀可能会通过降低页岩样品的机械强度进一步导致其宏观损伤。
