Experimental study on Sc-CO2 fracturing of granite under real-time high temperature and true triaxial stress
文献类型：期刊论文
| 作者 | Yang, Yang1,2; Hu, Dawei1,2; Wang, Haizhu3; Wang, Yunteng4; Guo, Dianbin5; Zhou, Hui1,2 |
| 刊名 | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
 |
| 出版日期 | 2024-11-01 |
| 卷号 | 183页码:14 |
| 关键词 | Sc-CO 2 fracturing Granite High-temperature True triaxial stress Enhanced geothermal system Deep geothermal exploitation |
| ISSN号 | 1365-1609 |
| DOI | 10.1016/j.ijrmms.2024.105889 |
| 英文摘要 | Sc-CO2 fracturing would be a potential stimulation method for Hot Dry Rock. A series of Sc-CO2 fracturing experiments were performed on granite under different temperature and stress conditions. Quantitative and qualitative analysis of injection pressure curves and cracks were conducted to explain the Sc-CO2 fracturing mechanism under high temperature and high stress conditions. Under the same stress conditions, as the temperature increases, the breakdown pressure decreases. Concurrently, the volume and length of macro-cracks on the sample surface decrease, whereas the volume of micro-cracks within the sample increases. Under the same temperature conditions, as the stress increases, the breakdown pressure increases. However, this increasing trend is less noticeable at high temperatures. Compared with hydraulic fracturing, due to the lower density and viscosity of CO2, Sc-CO2 fracturing takes longer from injection to breakdown and has lower breakdown pressure. The effect of high temperature on fracturing mainly manifests in the generation of microscopic thermal cracks and a reduction in viscosity and density of Sc-CO2. Low viscosity and low density CO2 are more likely to penetrate into the thermal cracks of the sample, generating a diffuse micro-crack network, leading to an increase in pore pressure and a reduction in effective stress near the wellbore. Consequently, there is propagation of these micro-cracks, resulting in an increase in the volume of micro-cracks while the volume and length of macro-cracks decrease, ultimately leading to a decrease in breakdown pressure. High stress primarily influences the fracture process by reducing the opening width of microscopic thermal cracks. This reduction inhibits the diffusion of ScCO2 through these cracks, ultimately leads to an increase in breakdown pressure. The findings of this experimental study provide a theoretical basis for efficient fracturing and crack creation in hot dry rock reservoirs. |
| 资助项目 | Na-tional Key Research and Development Program of China[2022YFE0137200] ; National Natural Science Foundation of China[52179114] ; OeAD-GmbH Scientific & Technological Cooperation (WTZ) Austria/China program |
| WOS研究方向 | Engineering ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:001309031200001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/42459]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Hu, Dawei |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.China Univ Petr, State Key Lab Petr Resources & Engn, Beijing 102249, Peoples R China 4.Univ Bodenkultur Wien, Inst Geotech, Feistmantelstr 4, A-1180 Vienna, Austria 5.Sinopec Star Co Ltd, Beijing 100000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Yang,Hu, Dawei,Wang, Haizhu,et al. Experimental study on Sc-CO2 fracturing of granite under real-time high temperature and true triaxial stress[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2024,183:14. |
| APA | Yang, Yang,Hu, Dawei,Wang, Haizhu,Wang, Yunteng,Guo, Dianbin,&Zhou, Hui.(2024).Experimental study on Sc-CO2 fracturing of granite under real-time high temperature and true triaxial stress.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,183,14. |
| MLA | Yang, Yang,et al."Experimental study on Sc-CO2 fracturing of granite under real-time high temperature and true triaxial stress".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 183(2024):14. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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