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Journal Article

Enhanced Coalbed Methane Recovery from Lignite Using CO2and N2

Authors

Shen,  Shaicheng
External Organizations;

Fang,  Zhiming
External Organizations;

Li,  Xiaochun
External Organizations;

Jiang,  Quan
External Organizations;

/persons/resource/shm

Shen,  Haimeng
4.3 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Shi,  Lu
External Organizations;

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Citation

Shen, S., Fang, Z., Li, X., Jiang, Q., Shen, H., Shi, L. (2025): Enhanced Coalbed Methane Recovery from Lignite Using CO2and N2. - Energy and Fuels, 39, 22, 10394-10409.
https://doi.org/10.1021/acs.energyfuels.5c01752


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5035582
Abstract
Experimental studies on enhanced coalbed methane recovery (ECBM) are crucial for advancing our understanding of gas extraction mechanisms. This investigation evaluates the feasibility of CO2/N2-ECBM application in lignite, a coal type that has received limited attention in prior ECBM studies. The adsorption characteristics of carbon dioxide, methane, and nitrogen in lignite were systematically evaluated, followed by comprehensive CO2/N2-ECBM experiments employing a self-developed experimental apparatus under various injection strategies. Key findings include the following: (1) At equivalent pressures (0.5–2.5 MPa), the adsorption capacity of carbon dioxide in lignite exceeds that of methane by a factor of 6–7, whereas nitrogen adsorption reaches 78–88% of methane levels. (2) Carbon dioxide injection predominantly occurs through matrix adsorption, achieving 70% storage efficiency with 20% displacement effectiveness. Conversely, nitrogen migration primarily follows fracture networks, yielding 20–24% storage efficiency while enhancing displacement performance. (3) Constant-pressure injection exhibits the lowest methane recovery among tested methods, particularly due to the nondrainable nature of residual methane trapped in semiclosed fracture systems.