Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressures
Unconventional resources (oil, gas, and geothermal) are often buried deep underground within dense rock strata and complex geological structures, making it increasingly difficult to create volumetric fractures through conventional hydraulic fracturing. This paper introduces a novel method of supercr...
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| Format: | Article |
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Elsevier
2025-01-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775524003172 |
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| author | Shaobin Hu Zhengyong Yan Chun Zhu Manchao He Shuogang Pang |
| author_facet | Shaobin Hu Zhengyong Yan Chun Zhu Manchao He Shuogang Pang |
| author_sort | Shaobin Hu |
| collection | DOAJ |
| description | Unconventional resources (oil, gas, and geothermal) are often buried deep underground within dense rock strata and complex geological structures, making it increasingly difficult to create volumetric fractures through conventional hydraulic fracturing. This paper introduces a novel method of supercritical energetic fluid thermal shock fracturing. It pioneers a CO2 deflagration impact triaxial pneumatic fracturing experimental system, using high-strength similar materials to simulate deep, hard rock masses. The study investigates the rock-breaking process and crack propagation patterns under supercritical CO2 thermal shock, revealing and discussing the types of thermal shock-induced fractures, their formation conditions, and discrimination criteria. The research indicates that higher supercritical CO2 thermal shock pressures and faster pressure release rates facilitate the formation of radial branching fractures, circumferential cracks, and branch cracks. Typically, CO2 thermal shock generates 3–5 radial main cracks, which is significantly more than the single main crack formed by hydraulic fracturing. The formation of branched cracks is often caused by compression-shear failure and occurs under relatively harsh conditions, determined by the confining pressure, rock properties, peak thermal shock pressure, and the pressure sustained post-decompression. The findings are expected to offer a safe, efficient, and controllable shockwave method of supercritical fluid thermal shock fracturing for the exploitation of deep unconventional oil and gas resources. |
| format | Article |
| id | doaj-art-f16a26fa9c4a41e98984e1cf5dae599d |
| institution | Kabale University |
| issn | 1674-7755 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj-art-f16a26fa9c4a41e98984e1cf5dae599d2025-01-17T04:49:11ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552025-01-01171370384Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressuresShaobin Hu0Zhengyong Yan1Chun Zhu2Manchao He3Shuogang Pang4College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, China; Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, China; Corresponding author. College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, China.College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, China; Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, ChinaSchool of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, ChinaNational Key Laboratory for Disaster Prevention, Control, and Intelligent Construction and Maintenance of Tunnel Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China; School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, ChinaCollege of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, China; Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, ChinaUnconventional resources (oil, gas, and geothermal) are often buried deep underground within dense rock strata and complex geological structures, making it increasingly difficult to create volumetric fractures through conventional hydraulic fracturing. This paper introduces a novel method of supercritical energetic fluid thermal shock fracturing. It pioneers a CO2 deflagration impact triaxial pneumatic fracturing experimental system, using high-strength similar materials to simulate deep, hard rock masses. The study investigates the rock-breaking process and crack propagation patterns under supercritical CO2 thermal shock, revealing and discussing the types of thermal shock-induced fractures, their formation conditions, and discrimination criteria. The research indicates that higher supercritical CO2 thermal shock pressures and faster pressure release rates facilitate the formation of radial branching fractures, circumferential cracks, and branch cracks. Typically, CO2 thermal shock generates 3–5 radial main cracks, which is significantly more than the single main crack formed by hydraulic fracturing. The formation of branched cracks is often caused by compression-shear failure and occurs under relatively harsh conditions, determined by the confining pressure, rock properties, peak thermal shock pressure, and the pressure sustained post-decompression. The findings are expected to offer a safe, efficient, and controllable shockwave method of supercritical fluid thermal shock fracturing for the exploitation of deep unconventional oil and gas resources.http://www.sciencedirect.com/science/article/pii/S1674775524003172Cracking mechanismSupercritical CO2True triaxial experimentalImpact fracturing |
| spellingShingle | Shaobin Hu Zhengyong Yan Chun Zhu Manchao He Shuogang Pang Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressures Journal of Rock Mechanics and Geotechnical Engineering Cracking mechanism Supercritical CO2 True triaxial experimental Impact fracturing |
| title | Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressures |
| title_full | Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressures |
| title_fullStr | Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressures |
| title_full_unstemmed | Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressures |
| title_short | Impact fracturing of rock-like material using carbon dioxide under different temperatures and pressures |
| title_sort | impact fracturing of rock like material using carbon dioxide under different temperatures and pressures |
| topic | Cracking mechanism Supercritical CO2 True triaxial experimental Impact fracturing |
| url | http://www.sciencedirect.com/science/article/pii/S1674775524003172 |
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