A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application

Xinlu Yan, Songhang Zhang, Shuheng Tang, Zhongcheng Li, Yongxiang Yi, Qian Zhang, Qiuping Hu and Yuxin Liu
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Xinlu Yan: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Songhang Zhang: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Shuheng Tang: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Zhongcheng Li: China United Coalbed Methane Corporation Ltd., Beijing 100011, China
Yongxiang Yi: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Qian Zhang: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Qiuping Hu: China United Coalbed Methane Corporation Ltd., Beijing 100011, China
Yuxin Liu: China United Coalbed Methane Corporation Ltd., Beijing 100011, China

Energies, 2020, vol. 13, issue 3, 1-17

Abstract: 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.

Keywords: coal reservoir classification; permeability; dynamic characteristics; influencing factors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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