Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped Well
A key point in the underground coal gasification process is the cavity evolution in the horizontal segment. The morphological evolution law of the gasification cavity has not been clarified, which is the bottleneck restricting the analysis of its controllability. In this paper, a physical simulation...
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MDPI AG
2023-04-01
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| author | Yufeng Zhao Zhen Dong Yanpeng Chen Hao Chen Shanshan Chen Mengyuan Zhang Junjie Xue Xinggang Wang Lixin Jiao |
| author_facet | Yufeng Zhao Zhen Dong Yanpeng Chen Hao Chen Shanshan Chen Mengyuan Zhang Junjie Xue Xinggang Wang Lixin Jiao |
| author_sort | Yufeng Zhao |
| collection | DOAJ |
| description | A key point in the underground coal gasification process is the cavity evolution in the horizontal segment. The morphological evolution law of the gasification cavity has not been clarified, which is the bottleneck restricting the analysis of its controllability. In this paper, a physical simulation system for cavity generation was developed, and the cavity evolution in a targeted coal seam with overburden pressure was duplicated in the laboratory. A set of temperature field synchronous monitoring devices was developed to realize temperature sampling within a cavity and the surrounding rock. By analyzing the relationship between the overall temperature distribution pattern and the gasification agent injection condition, the morphological propagation law of the cavity is verified to be water drop-shaped, and influencing factors including the injection flow rate and the gasification agent component ratio are investigated. The axial length and volume of the cavity increase with an increasing injection flow rate. Higher oxygen content results in increased size in all dimensions. The research results provide theoretical support and reference for applying controlled cavity formation in the horizontal segment of U-shaped wells. |
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| id | doaj.art-9451274aedac4ebe8f838664b9f1f73f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T05:04:13Z |
| publishDate | 2023-04-01 |
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| spelling | doaj.art-9451274aedac4ebe8f838664b9f1f73f2023-11-17T19:05:25ZengMDPI AGEnergies1996-10732023-04-01168345210.3390/en16083452Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped WellYufeng Zhao0Zhen Dong1Yanpeng Chen2Hao Chen3Shanshan Chen4Mengyuan Zhang5Junjie Xue6Xinggang Wang7Lixin Jiao8Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaResearch Institute of Exploration and Development, Tuha Oilfield Company, PetroChina, Hami 839009, ChinaResearch Institute of Exploration and Development, Tuha Oilfield Company, PetroChina, Hami 839009, ChinaA key point in the underground coal gasification process is the cavity evolution in the horizontal segment. The morphological evolution law of the gasification cavity has not been clarified, which is the bottleneck restricting the analysis of its controllability. In this paper, a physical simulation system for cavity generation was developed, and the cavity evolution in a targeted coal seam with overburden pressure was duplicated in the laboratory. A set of temperature field synchronous monitoring devices was developed to realize temperature sampling within a cavity and the surrounding rock. By analyzing the relationship between the overall temperature distribution pattern and the gasification agent injection condition, the morphological propagation law of the cavity is verified to be water drop-shaped, and influencing factors including the injection flow rate and the gasification agent component ratio are investigated. The axial length and volume of the cavity increase with an increasing injection flow rate. Higher oxygen content results in increased size in all dimensions. The research results provide theoretical support and reference for applying controlled cavity formation in the horizontal segment of U-shaped wells.https://www.mdpi.com/1996-1073/16/8/3452underground coal gasificationgasification cavitycavity evolutionphysical simulationtemperature field |
| spellingShingle | Yufeng Zhao Zhen Dong Yanpeng Chen Hao Chen Shanshan Chen Mengyuan Zhang Junjie Xue Xinggang Wang Lixin Jiao Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped Well Energies underground coal gasification gasification cavity cavity evolution physical simulation temperature field |
| title | Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped Well |
| title_full | Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped Well |
| title_fullStr | Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped Well |
| title_full_unstemmed | Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped Well |
| title_short | Physical Simulation Test of Underground Coal Gasification Cavity Evolution in the Horizontal Segment of U-Shaped Well |
| title_sort | physical simulation test of underground coal gasification cavity evolution in the horizontal segment of u shaped well |
| topic | underground coal gasification gasification cavity cavity evolution physical simulation temperature field |
| url | https://www.mdpi.com/1996-1073/16/8/3452 |
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