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Laboratory Study on Changes in the Pore Structures and Gas Desorption Properties of Intact and Tectonic Coals after Supercritical CO 2 Treatment: Implications for Coalbed Methane Recovery

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  • Erlei Su

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China)

  • Yunpei Liang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China)

  • Lei Li

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    State Key Laboratory of Gas Disaster Monitoring and Emergency Technology, Chongqing 400037, China
    China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China)

  • Quanle Zou

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China)

  • Fanfan Niu

    (Zhengzhou Engineering Co., Ltd. of China Railway Seventh Group, Zhengzhou 450052, China)

Abstract

Tectonic coals in coal seams may affect the process of enhanced coalbed methane recovery with CO 2 sequestration (CO 2 -ECBM). The main objective of this study was to investigate the differences between supercritical CO 2 (ScCO 2 ) and intact and tectonic coals to determine how the ScCO 2 changes the coal’s properties. More specifically, the changes in the tectonic coal’s pore structures and its gas desorption behavior were of particular interest. In this work, mercury intrusion porosimetry, N 2 (77 K) adsorption, and methane desorption experiments were used to identify the difference in pore structures and gas desorption properties between and intact and tectonic coals after ScCO 2 treatment. The experimental results indicate that the total pore volume, specific surface area, and pore connectivity of tectonic coal increased more than intact coal after ScCO 2 treatment, indicating that ScCO 2 had the greatest influence on the pore structure of the tectonic coal. Additionally, ScCO 2 treatment enhanced the diffusivity of tectonic coal more than that of intact coal. This verified the pore structure experimental results. A simplified illustration of the methane migration before and after ScCO 2 treatment was proposed to analyze the influence of ScCO 2 on the tectonic coal reservoir’s CBM. Hence, the results of this study may provide new insights into CO 2 -ECBM in tectonic coal reservoirs.

Suggested Citation

  • Erlei Su & Yunpei Liang & Lei Li & Quanle Zou & Fanfan Niu, 2018. "Laboratory Study on Changes in the Pore Structures and Gas Desorption Properties of Intact and Tectonic Coals after Supercritical CO 2 Treatment: Implications for Coalbed Methane Recovery," Energies, MDPI, vol. 11(12), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3419-:d:188469
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    References listed on IDEAS

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    1. Gale, John, 2004. "Geological storage of CO2: What do we know, where are the gaps and what more needs to be done?," Energy, Elsevier, vol. 29(9), pages 1329-1338.
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