Characteristics and control mechanisms of coalbed permeability change in various gas production stages

According to dimensionless analysis of the coalbed methane （CBM） production data of Fanzhuang block in southern Qinshui basin, the dimensionless gas production rate is calculated to quantitatively divide the CBM well production process into four stages, i.e., drai- nage stage, unstable gas productio...

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Published inPetroleum science Vol. 12; no. 4; pp. 684 - 691
Main Authors Tang, Da-Zhen, Deng, Chun-Miao, Meng, Yan-Jun, Li, Zhi-Ping, Xu, Hao, Tao, Shu, Li, Song
Format Journal Article
LanguageEnglish
Published Beijing China University of Petroleum (Beijing) 01.11.2015
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane Development & Utilization,Beijing 100083, China
Subjects
Earth and Environmental Science
Earth Sciences
Economics and Management
Energy Policy
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Mineral Resources
Original Paper
天然气产量
机制
煤层气井
煤层渗透率
物质平衡方法
特征
生产阶段
直接控制
Permeability
Production stage
Dynamic change
Coalbed methane
Control mechanism
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Summary:According to dimensionless analysis of the coalbed methane （CBM） production data of Fanzhuang block in southern Qinshui basin, the dimensionless gas production rate is calculated to quantitatively divide the CBM well production process into four stages, i.e., drai- nage stage, unstable gas production stage, stable gas pro- duction stage, and gas production decline stage. By the material balance method, the coal reservoir permeability change in different stages is quantitatively characterized. The characteristics and control mechanisms of change in coalbed permeability （CICP） during different production stages are concluded on five aspects, i.e., permeability trend variation, controlling mechanism, system energy, phase state compositions, and production performance. The study reveals that CICP is characterized by first decline, then recovery, and finally by increase and is controlled directly by effective stress and matrix shrinkage effects. Further, the duration and intensity of the matrix shrinkage effect are inherently controlled by adsorption and desorp- tion features.
Bibliography:According to dimensionless analysis of the coalbed methane （CBM） production data of Fanzhuang block in southern Qinshui basin, the dimensionless gas production rate is calculated to quantitatively divide the CBM well production process into four stages, i.e., drai- nage stage, unstable gas production stage, stable gas pro- duction stage, and gas production decline stage. By the material balance method, the coal reservoir permeability change in different stages is quantitatively characterized. The characteristics and control mechanisms of change in coalbed permeability （CICP） during different production stages are concluded on five aspects, i.e., permeability trend variation, controlling mechanism, system energy, phase state compositions, and production performance. The study reveals that CICP is characterized by first decline, then recovery, and finally by increase and is controlled directly by effective stress and matrix shrinkage effects. Further, the duration and intensity of the matrix shrinkage effect are inherently controlled by adsorption and desorp- tion features.
Production stage - Coalbed methane ;Permeability; Dynamic change - Control mechanism
11-4995/TE
ISSN:1672-5107
1995-8226
DOI:10.1007/s12182-015-0054-5