A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application
Due to the unique adsorption and desorption characteristics of coal, coal reservoir permeability changes dynamically during coalbed methane (CBM) development. Coal reservoirs can be classified using a permeability dynamic characterization in different production stages. In the single-phase water flo...
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| Format: | Article |
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MDPI AG
2020-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/3/644 |
| _version_ | 1798006937311248384 |
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| author | Xinlu Yan Songhang Zhang Shuheng Tang Zhongcheng Li Yongxiang Yi Qian Zhang Qiuping Hu Yuxin Liu |
| author_facet | Xinlu Yan Songhang Zhang Shuheng Tang Zhongcheng Li Yongxiang Yi Qian Zhang Qiuping Hu Yuxin Liu |
| author_sort | Xinlu Yan |
| collection | DOAJ |
| description | Due to the unique adsorption and desorption characteristics of coal, coal reservoir permeability changes dynamically during coalbed methane (CBM) development. Coal reservoirs can be classified using a permeability dynamic characterization in different production stages. In the single-phase water flow stage, four demarcating pressures are defined based on the damage from the effective stress on reservoir permeability. Coal reservoirs are classified into vulnerable, alleviative, and invulnerable reservoirs. In the gas desorption stage, two demarcating pressures are used to quantitatively characterize the recovery properties of permeability based on the recovery effect of the matrix shrinkage on permeability, namely the rebound pressure (the pressure corresponding to the lowest permeability) and recovery pressure (the pressure when permeability returns to initial permeability). Coal reservoirs are further classified into recoverable and unrecoverable reservoirs. The physical properties and influencing factors of these demarcating pressures are analyzed. Twenty-six wells from the Shizhuangnan Block in the southern Qinshui Basin of China were examined as a case study, showing that there is a significant correspondence between coal reservoir types and CBM well gas production. This study is helpful for identifying geological conditions of coal reservoirs as well as the productivity potential of CBM wells. |
| first_indexed | 2024-04-11T13:03:26Z |
| format | Article |
| id | doaj.art-0bf1a57ed0cb4fb485ae4427f352cb43 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:03:26Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
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| series | Energies |
| spelling | doaj.art-0bf1a57ed0cb4fb485ae4427f352cb432022-12-22T04:22:52ZengMDPI AGEnergies1996-10732020-02-0113364410.3390/en13030644en13030644A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its ApplicationXinlu Yan0Songhang Zhang1Shuheng Tang2Zhongcheng Li3Yongxiang Yi4Qian Zhang5Qiuping Hu6Yuxin Liu7School of Energy Resources, China University of Geosciences, Beijing 100083, ChinaSchool of Energy Resources, China University of Geosciences, Beijing 100083, ChinaSchool of Energy Resources, China University of Geosciences, Beijing 100083, ChinaChina United Coalbed Methane Corporation Ltd., Beijing 100011, ChinaSchool of Energy Resources, China University of Geosciences, Beijing 100083, ChinaSchool of Energy Resources, China University of Geosciences, Beijing 100083, ChinaChina United Coalbed Methane Corporation Ltd., Beijing 100011, ChinaChina United Coalbed Methane Corporation Ltd., Beijing 100011, ChinaDue to the unique adsorption and desorption characteristics of coal, coal reservoir permeability changes dynamically during coalbed methane (CBM) development. Coal reservoirs can be classified using a permeability dynamic characterization in different production stages. In the single-phase water flow stage, four demarcating pressures are defined based on the damage from the effective stress on reservoir permeability. Coal reservoirs are classified into vulnerable, alleviative, and invulnerable reservoirs. In the gas desorption stage, two demarcating pressures are used to quantitatively characterize the recovery properties of permeability based on the recovery effect of the matrix shrinkage on permeability, namely the rebound pressure (the pressure corresponding to the lowest permeability) and recovery pressure (the pressure when permeability returns to initial permeability). Coal reservoirs are further classified into recoverable and unrecoverable reservoirs. The physical properties and influencing factors of these demarcating pressures are analyzed. Twenty-six wells from the Shizhuangnan Block in the southern Qinshui Basin of China were examined as a case study, showing that there is a significant correspondence between coal reservoir types and CBM well gas production. This study is helpful for identifying geological conditions of coal reservoirs as well as the productivity potential of CBM wells.https://www.mdpi.com/1996-1073/13/3/644coal reservoir classificationpermeabilitydynamic characteristicsinfluencing factors |
| spellingShingle | Xinlu Yan Songhang Zhang Shuheng Tang Zhongcheng Li Yongxiang Yi Qian Zhang Qiuping Hu Yuxin Liu A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application Energies coal reservoir classification permeability dynamic characteristics influencing factors |
| title | A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application |
| title_full | A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application |
| title_fullStr | A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application |
| title_full_unstemmed | A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application |
| title_short | A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application |
| title_sort | comprehensive coal reservoir classification method base on permeability dynamic change and its application |
| topic | coal reservoir classification permeability dynamic characteristics influencing factors |
| url | https://www.mdpi.com/1996-1073/13/3/644 |
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