Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal
Abstract Acid fracturing fluids can effectively improve the microporous structure of coal, thereby enhancing the permeability of coal seam and the efficiency of gas drainage. To explore the effects of acid fracturing fluids on the pore structure modification of coal samples from different coal ranks...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-85007-6 |
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| author | Zhao Kang Li Liangwei Li Kun Zuo Shaojie Jiang Zhizhong |
| author_facet | Zhao Kang Li Liangwei Li Kun Zuo Shaojie Jiang Zhizhong |
| author_sort | Zhao Kang |
| collection | DOAJ |
| description | Abstract Acid fracturing fluids can effectively improve the microporous structure of coal, thereby enhancing the permeability of coal seam and the efficiency of gas drainage. To explore the effects of acid fracturing fluids on the pore structure modification of coal samples from different coal ranks, hydrochloric acid-based acid fracturing fluids were prepared and used to soak four types of medium to high-rank coal in an experiment. High-pressure mercury intrusion and liquid nitrogen adsorption techniques results demonstrated that the acid fracturing fluid can effectively alter the pore structure of coal. However, the modification effect does not exhibit a linear relationship with coal rank. The porosity of fat coal and coking coal increased by approximately 30%, while the surface area of gas coal and fat coal increased by about 20%. The new micropores produced by the acid fracturing fluid will increase the roughness of the fracture surface, but the widening of the original fracture will reduce the tortuosity of the fracture. Only the fractal dimension of lean coal has a significant change, about 6%. Overall, acid fracturing fluid has the best effect on gas coal and coking coal. The research results provide a reference for the selection and application of acid fracturing fluid in coal seam hydraulic fracturing. |
| format | Article |
| id | doaj-art-0a4b02ac456b41f781620e505e5d71db |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-0a4b02ac456b41f781620e505e5d71db2025-01-19T12:23:59ZengNature PortfolioScientific Reports2045-23222025-01-0115111210.1038/s41598-024-85007-6Study on the effect of acid fracturing fluid on pore structure of middle to high rank coalZhao Kang0Li Liangwei1Li Kun2Zuo Shaojie3Jiang Zhizhong4Xintian Coal Mine, Guizhou Yuneng Investment Co., Ltd.China Coal Technology and Engineering Group Chongqing Research InstituteCollege of Mining, Guizhou UniversityCollege of Mining, Guizhou UniversityCollege of Mining, Guizhou UniversityAbstract Acid fracturing fluids can effectively improve the microporous structure of coal, thereby enhancing the permeability of coal seam and the efficiency of gas drainage. To explore the effects of acid fracturing fluids on the pore structure modification of coal samples from different coal ranks, hydrochloric acid-based acid fracturing fluids were prepared and used to soak four types of medium to high-rank coal in an experiment. High-pressure mercury intrusion and liquid nitrogen adsorption techniques results demonstrated that the acid fracturing fluid can effectively alter the pore structure of coal. However, the modification effect does not exhibit a linear relationship with coal rank. The porosity of fat coal and coking coal increased by approximately 30%, while the surface area of gas coal and fat coal increased by about 20%. The new micropores produced by the acid fracturing fluid will increase the roughness of the fracture surface, but the widening of the original fracture will reduce the tortuosity of the fracture. Only the fractal dimension of lean coal has a significant change, about 6%. Overall, acid fracturing fluid has the best effect on gas coal and coking coal. The research results provide a reference for the selection and application of acid fracturing fluid in coal seam hydraulic fracturing.https://doi.org/10.1038/s41598-024-85007-6Acid fracturing fluidPore structureMiddle and high rank coalCoal seam gasExperimental research |
| spellingShingle | Zhao Kang Li Liangwei Li Kun Zuo Shaojie Jiang Zhizhong Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal Scientific Reports Acid fracturing fluid Pore structure Middle and high rank coal Coal seam gas Experimental research |
| title | Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal |
| title_full | Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal |
| title_fullStr | Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal |
| title_full_unstemmed | Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal |
| title_short | Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal |
| title_sort | study on the effect of acid fracturing fluid on pore structure of middle to high rank coal |
| topic | Acid fracturing fluid Pore structure Middle and high rank coal Coal seam gas Experimental research |
| url | https://doi.org/10.1038/s41598-024-85007-6 |
| work_keys_str_mv | AT zhaokang studyontheeffectofacidfracturingfluidonporestructureofmiddletohighrankcoal AT liliangwei studyontheeffectofacidfracturingfluidonporestructureofmiddletohighrankcoal AT likun studyontheeffectofacidfracturingfluidonporestructureofmiddletohighrankcoal AT zuoshaojie studyontheeffectofacidfracturingfluidonporestructureofmiddletohighrankcoal AT jiangzhizhong studyontheeffectofacidfracturingfluidonporestructureofmiddletohighrankcoal |