Combined Effect of In Situ Stress Level and Bedding Anisotropy on Hydraulic Fracture Vertical Growth in Deep Marine Shale Revealed via CT Scans and Acoustic Emission
文献类型：期刊论文
| 作者 | Guo, Peng2; Li, Xiao1,2; Li, Shouding1; Mao, Tianqiao1 |
| 刊名 | ENERGIES
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 16期号:21页码:14 |
| 关键词 | in situ stress level bedding anisotropy hydraulic fracture growth CT scans acoustic emission |
| DOI | 10.3390/en16217270 |
| 英文摘要 | The economic exploitation of unconventional gas and oil in deep shale relies closely on effective hydraulic fracturing stimulations. However, the fracturing operations of deep shale reservoirs face challenges of insufficient fracture growth and a rapid decline in productivity due to the increasing in situ stress level. In addition, the shale strata on the margin of the Sichuan Basin are frequently folded and faulted, and the change in bedding inclinations significantly complicates the process of hydraulic fracturing. The investigation of the combined effect of the in situ stress level and bedding anisotropy on the hydraulic fracture configuration is vital for fracturing engineering design. To analyze this, we conducted hydraulic fracturing tests on shale cores to simulate the hydraulic fracture initiation and growth from a horizontally positioned perforation. By using acoustic emission detection and CT scans, the influence of natural stress levels and the angle of the shale's bedding on the process of hydraulic fracturing in shale and the resulting fracture geometry were analyzed. The results showed that the area of hydraulic fracture under a higher stress level (sigma(1) = 50 MPa, sigma(3) = 40 MPa) was about 13%similar to 23% smaller than that created under the lower stress level (sigma(1) = 30 MPa, sigma(3) = 20 MPa) when the bedding angle was smaller than 60 degrees. With the increase in bedding angle, the curves of the fracture area and fracture network index under two different stress levels presented similar decreasing trends. Also, the time from micro-crack generation to sample breakdown was significantly reduced when the bedding orientation changed from the horizontal to vertical position. The increasing stress level significantly increased the breakdown pressure. In particular, the fracturing of shale samples with bedding angles of 0 degrees and 30 degrees required a higher fluid pressure and released more energy than samples with larger bedding inclinations. Additionally, the measurement of the sample radial deformation indicated that the hydraulic fracture opening extent was reduced by about 46%similar to 81% with the increasing stress level. |
| WOS关键词 | UNCONVENTIONAL RESERVOIRS ; PROPAGATION ; INITIATION ; MORPHOLOGY |
| 资助项目 | National Natural Science Foundation of China[42090023] ; National Key R&D Program of China[2020YFA0710504] |
| WOS研究方向 | Energy & Fuels |
| 语种 | 英语 |
| 出版者 | MDPI |
| WOS记录号 | WOS:001103344800001 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/110660]  |
| 专题 | 地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室 |
| 通讯作者 | Guo, Peng; Li, Xiao |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China 2.Peking Univ, Inst Energy, Sch Earth & Space Sci, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Peng,Li, Xiao,Li, Shouding,et al. Combined Effect of In Situ Stress Level and Bedding Anisotropy on Hydraulic Fracture Vertical Growth in Deep Marine Shale Revealed via CT Scans and Acoustic Emission[J]. ENERGIES,2023,16(21):14. |
| APA | Guo, Peng,Li, Xiao,Li, Shouding,&Mao, Tianqiao.(2023).Combined Effect of In Situ Stress Level and Bedding Anisotropy on Hydraulic Fracture Vertical Growth in Deep Marine Shale Revealed via CT Scans and Acoustic Emission.ENERGIES,16(21),14. |
| MLA | Guo, Peng,et al."Combined Effect of In Situ Stress Level and Bedding Anisotropy on Hydraulic Fracture Vertical Growth in Deep Marine Shale Revealed via CT Scans and Acoustic Emission".ENERGIES 16.21(2023):14. |
入库方式： OAI收割
来源：地质与地球物理研究所
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