Experimental investigation on mode I fracture characteristics of Longmaxi formation shale after cyclic thermal shock and high-temperature acid etching treatments
文献类型：期刊论文
| 作者 | Chang, Xin2; Wang, Xingyi3; Yang, Chunhe2; Guo, Yintong2; Wan, Yanghui1 |
| 刊名 | ENGINEERING FRACTURE MECHANICS
 |
| 出版日期 | 2024-01-23 |
| 卷号 | 295页码:22 |
| 关键词 | Fracture toughness Thermal shocks Acid etching Digital image correlation AE technique |
| ISSN号 | 0013-7944 |
| DOI | 10.1016/j.engfracmech.2023.109762 |
| 英文摘要 | Fracture toughness is a key parameter for shale hydraulic fracturing design, which directly affects the fracture initiation pressure. In this paper, the influence of cyclic thermal shock and high -temperature acid etching on the Mode I fracture of Longmaxi Formation shale was investi-gated. The crack propagation was obtained by using acoustic emission (AE) and digital image correlation (DIC) techniques. Meanwhile, the fracture surface morphology and microstructure of the specimens were analyzed using white light interferometer and scanning electron microscope (SEM). The experimental results demonstrate that cyclic thermal shock severely degrades the nominal strength and fracture toughness of shale. The average fracture toughness is found to be only 0.67 MPa & sdot;m0.5, which accounts for a reduction of 25.9 %. AE analysis reveals that micro -fracture is the dominant mechanism, with the highest amplitude of AE source only 78 dB. The critical strain value of the fracture propagation zone (FPZ) is determined to be 1.35 %o, and SEM images indicate that along-crystal fracture is the primary fracture mechanism. On the other hand, the shale specimen subjected to high-temperature acid-etching treatment exhibits an average fracture toughness of 0.86 MPa & sdot;m0.5, with the AE source amplitude reaching 86 dB. The critical strain value of the FPZ was measured to be 2.38 %o. The fracture surface appears smooth and is mainly characterized by perforated-crystal rupture. The findings of this study not only enhance our understanding of shale mode I fracture toughness but also provide valuable insights for optimizing process parameters to reduce initiation pressure in deep shale formations. |
| 资助项目 | National Natural Science Foundation of China[52104046] ; State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development[20-YYGZ-KF-GC-08] |
| WOS研究方向 | Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001125896800001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/40122]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Chang, Xin |
| 作者单位 | 1.Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Yangtze Univ, Petr & Engn Coll, Wuhan 430100, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chang, Xin,Wang, Xingyi,Yang, Chunhe,et al. Experimental investigation on mode I fracture characteristics of Longmaxi formation shale after cyclic thermal shock and high-temperature acid etching treatments[J]. ENGINEERING FRACTURE MECHANICS,2024,295:22. |
| APA | Chang, Xin,Wang, Xingyi,Yang, Chunhe,Guo, Yintong,&Wan, Yanghui.(2024).Experimental investigation on mode I fracture characteristics of Longmaxi formation shale after cyclic thermal shock and high-temperature acid etching treatments.ENGINEERING FRACTURE MECHANICS,295,22. |
| MLA | Chang, Xin,et al."Experimental investigation on mode I fracture characteristics of Longmaxi formation shale after cyclic thermal shock and high-temperature acid etching treatments".ENGINEERING FRACTURE MECHANICS 295(2024):22. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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