Micro-CT characterization on pore structure evolution of low-permeability sandstone under acid treatment
文献类型：期刊论文
| 作者 | Liu, Sinan1,4; Zhang, Liwei1,4; Su, Xuebin3; Zhao, Lixin2; Wang, Yan1 |
| 刊名 | APPLIED GEOCHEMISTRY
 |
| 出版日期 | 2023-05-01 |
| 卷号 | 152期号:-页码:- |
| 关键词 | Pore structure CT scanning Permeability enhancement Acid treatment CCUS |
| ISSN号 | 0883-2927 |
| 英文摘要 | Permeability enhancement via acid has drawn broad attention in mining and oil industries to treat low -permeability formations to increase the resource recovery rate. In this study, experiments including static acid permeability enhancement tests, flooding acid permeability enhancement tests, and micro-CT scanning were conducted to investigate the mechanism of permeability enhancement and changes in pore structure during acid treatment. First, the extent of reaction between low-permeability sandstone samples and four different acids was evaluated by static tests. The hydrochloric and formic acids exhibited good performance to dissolve filling minerals during static tests. Second, acid flooding in sandstone cores was carried out under reservoir conditions. After acid flooding, the porosities of sandstone cores were significantly increased and a decrease in pressure difference was observed, demonstrating a permeability increase. The pressure difference of hydrochloric acids was lower than that of formic acids at the end of flooding, and the permeability results indicated that the per-centage of permeability increase by hydrochloric acid treatment and formic acid treatment were 283% and 120%, respectively. Third, all samples were scanned by micro-CT before and after acid permeability enhance-ment tests, and CT images were analyzed to study changes in pores, pore throats, and coordination numbers using Avizo software. The mineral compositions and 2D micromorphology were characterized by SEM-EDS, XRD and ICP. After acid treatment, the number of interconnected pores, pore throats, and their equivalent radii all increased, leading to a higher permeability. The improved permeability was mainly due to the dissolution of dolomite, which was identified by SEM-EDS and ICP. |
| 学科主题 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000965093400001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35321]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China 2.Beijing Research Institute of Chemical Engineering and Metallurgy, CNNC, Beijing, 101149, China 3.China National Uranium Co., Ltd., CNNC, Beijing, 100013, China 4.University of Chinese Academy of Sciences, Beijing, 100049, China |
| 推荐引用方式 GB/T 7714 | Liu, Sinan,Zhang, Liwei,Su, Xuebin,et al. Micro-CT characterization on pore structure evolution of low-permeability sandstone under acid treatment[J]. APPLIED GEOCHEMISTRY,2023,152(-):-. |
| APA | Liu, Sinan,Zhang, Liwei,Su, Xuebin,Zhao, Lixin,&Wang, Yan.(2023).Micro-CT characterization on pore structure evolution of low-permeability sandstone under acid treatment.APPLIED GEOCHEMISTRY,152(-),-. |
| MLA | Liu, Sinan,et al."Micro-CT characterization on pore structure evolution of low-permeability sandstone under acid treatment".APPLIED GEOCHEMISTRY 152.-(2023):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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