液态二氧化碳相变对煤中孔隙和裂缝的影响:实验研究

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS
Zebiao Jiang, Shikang Gao, Hao Liu, Siliang Chen, Qiaoshun Mo, Feng He
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引用次数: 0

摘要

液态二氧化碳(CO2)相变后煤中孔隙和裂缝的演化特征是决定渗透率增加效果的重要因素。因此,正确认识液态二氧化碳相变对煤中孔隙和裂缝的影响至关重要。通过低温液氮吸附实验,比较了裂隙煤和断裂煤的吸附和解吸等温线、孔隙大小、孔隙体积和比表面积的变化。此外,还采用扫描电子显微镜观察了断裂煤样和未断裂煤样的断裂特征,分析了连通性和断裂发育的变化。实验结果表明,与未断裂煤样相比,断裂煤样表现出更好的滞环性和更大的瓦斯解吸比例。与未断裂煤样相比,断裂煤样含有更多发育的孔隙和裂缝,其破碎程度、孔隙直径、裂缝宽度以及孔隙和裂缝的连通性也更好。此外,离压裂钻孔越近的煤样,压裂效果越好。这表明液态二氧化碳相变能有效提高煤中孔隙和裂缝的瓦斯运移能力。该研究成果为更好地应用液态二氧化碳相变压裂技术预防煤与瓦斯突出灾害、实现深部煤层瓦斯高效抽采提供了坚实的基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of liquid CO2 phase change on pores and fractures in coal: An experimental study

Effect of liquid CO2 phase change on pores and fractures in coal: An experimental study

The evolution characteristics of pores and fractures in coal after liquid carbon dioxide (CO2) phase change are important factors that determine the permeability increase effect. Therefore, it is critical to correctly understand the influences of liquid CO2 phase change on pores and fractures in coal. The changes of adsorption and desorption isotherm, pore size, pore volume, and specific surface area of fractured coal and fractured coal were compared by low temperature liquid nitrogen adsorption experiment. In addition, a scanning electron microscope was adopted to observe fracture characteristics of fractured and unfractured coal samples and analyze changes in the connectivity and fracture development. Experimental results show that the fractured coal samples exhibit better hysteresis loops and a larger proportion of gas desorption than the unfractured ones. Fractured coal samples contain more developed pores and fractures compared with unfractured ones, and their fragmentation degree, pore diameter, fracture width, and connectivity of pores and fractures are also better. Besides, the closer the samples from the fracturing boreholes are, the better the fracturing effect. This indicates that liquid CO2 phase change can effectively enhance the gas transport capacity in pores and fractures in coal. The research results provide a solid basis for the better application of liquid CO2 phase-change fracturing to the prevention of coal and gas outburst disasters and the realization of efficient gas extraction in deep coal seams.

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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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