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Experimental study of the adsorption-induced coal matrix swelling and its impact on ECBM

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Abstract

Carbon dioxide (CO2) enhanced coalbed methane (ECBM) is an effective method to improve methane (CH4) production and this technology has already been used to increase gas production in several field trials worldwide. One major problem is the injection drop in the later period due to permeability decrease caused by coal matrix swelling induced by CO2 injection. In order to quantify the swelling effect, in this work, coal samples were collected from the Bulli coal seam, Sydney Basin and adsorption tests with simultaneous matrix swelling measurement were conducted. The adsorption and swelling characteristics were analyzed by measuring the adsorption mass simultaneously with the strain measurement. Then experiments were conducted to replicate the ECBM process using the indirect gravity method to obtain the swelling strain change with CO2 injection. The results show that the coal adsorption capacity in CO2 is almost two times greater than that in CH4, and nitrogen adsorption is the least among these gases. A Langmuir-like model can be used to describe the strain with the gas pressure and the swelling strain induced by gas adsorption has a linear relationship with gas adsorption quantity. Moreover, swelling strain increase was observed when CO2 was injected into the sample cell and the swelling strain was almost the sum of the strains induced by different gases at corresponding partial gas pressure.

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Acknowledgments

The first author would like to thank the China Scholarship Council (CSC), China, and the University of Wollongong (UOW), Australia for funding his study in Australia. The authors also thank the technical staff in UOW, especially the laboratory technicians Alan Grant, Duncan Best, Richard Berndt. This work was supported by the Australian Coal Industry’s Research Program (No. ACARP C24019), the National Natural Science Foundation of China (No. 51604153), and the National Science and Technology Major Project (No. 2016ZX05045-004-006). The final publication is available at Springer via https://doi.org/10.1007/s12583-017-0778-9.

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Authors and Affiliations

  1. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, New South Wales, 2500, Australia

    Jia Lin, Ting Ren, Gongda Wang, Patrick Booth & Jan Nemcik

  2. Mine Safety Technology Branch, China Coal Research Institute, Beijing, 100013, China

    Gongda Wang

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  1. Jia Lin
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  2. Ting Ren
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  4. Patrick Booth
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Correspondence to Jia Lin.

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Lin, J., Ren, T., Wang, G. et al. Experimental study of the adsorption-induced coal matrix swelling and its impact on ECBM. J. Earth Sci. 28, 917–925 (2017). https://doi.org/10.1007/s12583-017-0778-9

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  • DOI: https://doi.org/10.1007/s12583-017-0778-9

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