Experimental study on shale fracturing assisted by low-temperature freezing
Under the cold impact of liquid nitrogen, the shale suffers from the significant freezing damage, which provides the possibility of liquid nitrogen fracturing. Moreover, shale fracturing assisted by liquid nitrogen can effectively reduce reservoir pollution. In this paper, the hydraulic fracturing e...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2018-12-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2222 |
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| author | Zhongying Han Yuanfang Cheng Xue-Liang Li Chuan-liang Yan |
| author_facet | Zhongying Han Yuanfang Cheng Xue-Liang Li Chuan-liang Yan |
| author_sort | Zhongying Han |
| collection | DOAJ |
| description | Under the cold impact of liquid nitrogen, the shale suffers from the significant freezing damage, which provides the possibility of liquid nitrogen fracturing. Moreover, shale fracturing assisted by liquid nitrogen can effectively reduce reservoir pollution. In this paper, the hydraulic fracturing experiments of natural shale samples frozen by liquid nitrogen were carried out to investigate the factors affecting the crack propagation of shale after low temperature fracturing. The results show that a large number of cracks or macropores form inside the natural shale sample after freezing treatment by liquid nitrogen. The fracture pressure of the shale decreases with increasing impact time at the beginning of the immersion time, and remains substantially stable after an immersion of 2 hours. When the freezing time increases, the crack initiation time increases accordingly. After low temperature impact, the fracture pressure of shale decreases with the increase of stress difference, but the cracking times vary with the stress with obvious regularity. It is easier to form main fracture with larger displacement on the premise of well-developed shale bedding. |
| format | Article |
| id | doaj-art-00680ace527a4d0999bb86c678dbc419 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2018-12-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-00680ace527a4d0999bb86c678dbc4192025-01-03T00:39:47ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932018-12-011347Experimental study on shale fracturing assisted by low-temperature freezingZhongying Han0Yuanfang ChengXue-Liang Li1Chuan-liang Yan2China University of PetroleumSchool of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.Under the cold impact of liquid nitrogen, the shale suffers from the significant freezing damage, which provides the possibility of liquid nitrogen fracturing. Moreover, shale fracturing assisted by liquid nitrogen can effectively reduce reservoir pollution. In this paper, the hydraulic fracturing experiments of natural shale samples frozen by liquid nitrogen were carried out to investigate the factors affecting the crack propagation of shale after low temperature fracturing. The results show that a large number of cracks or macropores form inside the natural shale sample after freezing treatment by liquid nitrogen. The fracture pressure of the shale decreases with increasing impact time at the beginning of the immersion time, and remains substantially stable after an immersion of 2 hours. When the freezing time increases, the crack initiation time increases accordingly. After low temperature impact, the fracture pressure of shale decreases with the increase of stress difference, but the cracking times vary with the stress with obvious regularity. It is easier to form main fracture with larger displacement on the premise of well-developed shale bedding.https://www.fracturae.com/index.php/fis/article/view/2222Liquid nitrogenFreezingHydraulic fractureFracture pressureFracture initiation time |
| spellingShingle | Zhongying Han Yuanfang Cheng Xue-Liang Li Chuan-liang Yan Experimental study on shale fracturing assisted by low-temperature freezing Fracture and Structural Integrity Liquid nitrogen Freezing Hydraulic fracture Fracture pressure Fracture initiation time |
| title | Experimental study on shale fracturing assisted by low-temperature freezing |
| title_full | Experimental study on shale fracturing assisted by low-temperature freezing |
| title_fullStr | Experimental study on shale fracturing assisted by low-temperature freezing |
| title_full_unstemmed | Experimental study on shale fracturing assisted by low-temperature freezing |
| title_short | Experimental study on shale fracturing assisted by low-temperature freezing |
| title_sort | experimental study on shale fracturing assisted by low temperature freezing |
| topic | Liquid nitrogen Freezing Hydraulic fracture Fracture pressure Fracture initiation time |
| url | https://www.fracturae.com/index.php/fis/article/view/2222 |
| work_keys_str_mv | AT zhongyinghan experimentalstudyonshalefracturingassistedbylowtemperaturefreezing AT yuanfangcheng experimentalstudyonshalefracturingassistedbylowtemperaturefreezing AT xueliangli experimentalstudyonshalefracturingassistedbylowtemperaturefreezing AT chuanliangyan experimentalstudyonshalefracturingassistedbylowtemperaturefreezing |