Effect of supercritical carbon dioxide on pore structure and methane adsorption of shale with different particle sizes

IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL
Liang Wang , Yuechen Zhao , Minxuan Liu , Zihang Song , Yiwei Sun , Sijia Ni , Shenguang Fu , Rongkun Pan
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Abstract

Supercritical carbon dioxide (SCCO2) fracturing significantly enhances shale gas recovery, which is influenced by particle size. We soaked shale in SCCO2 and investigated the impact of SCCO2 on different particle sizes. Large-particle shales showed the largest percentage changes in specific surface area and total pore volume (54.11 %, 87.87 %; 58.59 %, 76.32 %) followed by small-particle size shales. This trend was also observed in other pore structure parameters. The particle-size effect is: Large-particle shale, with abundant microfractures, enhances SCCO2 flow and pore alteration. Small-particle shale's high specific surface area facilitates SCCO2 penetration. Medium-particle shale is less affected due to balanced interactions of these factors. Methane is primarily found in large and medium pores and microfractures. Methane adsorption in shale mainly involves multi-layer adsorption. Following SCCO2 treatment, pore fractures narrowed, increasing the proportion of methane molecules adsorbed as a single-layer. This study is crucial for evaluating the fracturing effects on shale gas wells.

Abstract Image

超临界二氧化碳对不同粒径页岩的孔隙结构和甲烷吸附的影响
超临界二氧化碳(SCCO2)压裂法能显著提高页岩气的采收率,而页岩气的采收率受颗粒大小的影响。我们将页岩浸泡在 SCCO2 中,并研究了 SCCO2 对不同粒径的影响。大颗粒页岩的比表面积和总孔隙度的百分比变化最大(54.11 %、87.87 %;58.59 %、76.32 %),其次是小颗粒页岩。其他孔隙结构参数也呈现出这种趋势。颗粒大小的影响是大颗粒页岩具有丰富的微裂隙,可增强 SCCO2 流动和孔隙改变。小颗粒页岩的高比表面积有利于 SCCO2 的渗透。中颗粒页岩受到的影响较小,这是因为这些因素之间的相互作用达到了平衡。甲烷主要存在于大、中孔隙和微裂缝中。甲烷在页岩中的吸附主要涉及多层吸附。经 SCCO2 处理后,孔隙裂缝变窄,增加了单层吸附甲烷分子的比例。这项研究对于评估页岩气井的压裂效果至关重要。
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来源期刊
Journal of Supercritical Fluids
Journal of Supercritical Fluids 工程技术-工程:化工
CiteScore
7.60
自引率
10.30%
发文量
236
审稿时长
56 days
期刊介绍: The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.
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