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Numerical Simulation Study of Fines Migration Impacts on an Early Water Drainage Period in Undersaturated Coal Seam Gas Reservoirs
Joint Authors
You, Zhenjiang
Peng, Xiaolong
Zhu, Suyang
Du, Zhimin
Deng, Peng
Wang, Chaowen
Wang, Mingwei
Source
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-16, 16 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-12-30
Country of Publication
Egypt
No. of Pages
16
Main Subjects
Abstract EN
Coal fines migration exerts negative impacts on early water drainage of undersaturated coal seam gas (CSG) reservoirs.
The complicated migration process results in ineffective and inaccurate forecast of coal fines production.
Hence, a robust modelling tool is required to include the mechanisms of fines migration and to predict their impacts on rock and production.
In this paper, fines migration in coal is categorized into three stages: generation, migration, and deposition processes.
The corresponding models for different stages are established, including (1) a fines generation model, (2) the maximum fines-carrying concentration model and deviation factor of the modified Darcy model, (3) a fines deposition model, and (4) a dynamic permeability and porosity model.
The above models are coupled with a water flow model, solved numerically using the finite difference method.
Then, two dewatering strategies, including fast and moderate depressurization, are compared using the proposed models to study their effects on coal properties and following production.
Finally, the production history of a CSG well in the Qinshui Basin, China, is utilized for history matching in a field case study.
The simulation results indicate that new fines will be generated in a fast depressurization process and the water rate decline reduces the cleat permeability significantly.
The newly generated fines can enhance the permeability temporarily, but they will block the flow channels and bring serious damage to the permeability when the water rate declines.
The moderate depressurization strategy can produce the coal fines in a continuous mode, and the formation damage induced by fines deposition can be reduced to the acceptable level, which is the more reliable way to maintain well productivity.
In addition, multiple well shut-in can trigger the irreversible fines deposition, reduce the permeability, and decrease the production rate.
American Psychological Association (APA)
Peng, Xiaolong& Zhu, Suyang& You, Zhenjiang& Du, Zhimin& Deng, Peng& Wang, Chaowen…[et al.]. 2019. Numerical Simulation Study of Fines Migration Impacts on an Early Water Drainage Period in Undersaturated Coal Seam Gas Reservoirs. Geofluids،Vol. 2019, no. 2019, pp.1-16.
https://search.emarefa.net/detail/BIM-1153970
Modern Language Association (MLA)
Peng, Xiaolong…[et al.]. Numerical Simulation Study of Fines Migration Impacts on an Early Water Drainage Period in Undersaturated Coal Seam Gas Reservoirs. Geofluids No. 2019 (2019), pp.1-16.
https://search.emarefa.net/detail/BIM-1153970
American Medical Association (AMA)
Peng, Xiaolong& Zhu, Suyang& You, Zhenjiang& Du, Zhimin& Deng, Peng& Wang, Chaowen…[et al.]. Numerical Simulation Study of Fines Migration Impacts on an Early Water Drainage Period in Undersaturated Coal Seam Gas Reservoirs. Geofluids. 2019. Vol. 2019, no. 2019, pp.1-16.
https://search.emarefa.net/detail/BIM-1153970
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1153970