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An NMR-Based Method for Multiphase Methane Characterization in Coals

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  • Sijian Zheng

    (Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China
    The Key Laboratory of Coal-Based CO 2 Capture and Geological Storage, China University of Mining and Technology, Xuzhou 221116, China)

  • Shuxun Sang

    (Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China
    The Key Laboratory of Coal-Based CO 2 Capture and Geological Storage, China University of Mining and Technology, Xuzhou 221116, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

  • Shiqi Liu

    (Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China
    The Key Laboratory of Coal-Based CO 2 Capture and Geological Storage, China University of Mining and Technology, Xuzhou 221116, China)

  • Xin Jin

    (Xi’an Research Institute, China Coal Technology and Engineering Group, Xi’an 710077, China
    Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China)

  • Meng Wang

    (Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China
    The Key Laboratory of Coal-Based CO 2 Capture and Geological Storage, China University of Mining and Technology, Xuzhou 221116, China)

  • Shijian Lu

    (Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China
    The Key Laboratory of Coal-Based CO 2 Capture and Geological Storage, China University of Mining and Technology, Xuzhou 221116, China)

  • Guangjun Feng

    (School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

  • Yi Yang

    (Xi’an Research Institute, China Coal Technology and Engineering Group, Xi’an 710077, China)

  • Jun Hou

    (College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China)

Abstract

Discriminating multiphase methane (adsorbed and free phases) in coals is crucial for evaluating the optimal gas recovery strategies of coalbed methane (CBM) reservoirs. However, the existing volumetric-based adsorption isotherm method only provides the final methane adsorption result, limiting real-time dynamic characterization of multiphase methane in the methane adsorption process. In this study, via self-designed nuclear magnetic resonance (NMR) isotherm adsorption experiments, we present a new method to evaluate the dynamic multiphase methane changes in coals. The results indicate that the T 2 distributions of methane in coals involve three different peaks, labeled as P1 ( T 2 < 8 ms), P2 ( T 2 = 20–300 ms), and P3 ( T 2 > 300 ms) peaks, corresponding to the adsorbed phase methane, free phase methane between particles, and free phase methane in the sample cell, respectively. The methane adsorption Langmuir volumes calculated from the conventional volumetric-based method qualitatively agree with those obtained from the NMR method, within an allowable limit of approximately ~6.0%. Real-time dynamic characterizations of adsorbed methane show two different adsorption rates: an initial rapid adsorption of methane followed by a long stable state. It can be concluded that the NMR technique can be applied not only for methane adsorption capacity determination, but also for dynamic monitoring of multiphase methane in different experimental situations, such as methane adsorption/desorption and CO 2 -enhanced CBM.

Suggested Citation

  • Sijian Zheng & Shuxun Sang & Shiqi Liu & Xin Jin & Meng Wang & Shijian Lu & Guangjun Feng & Yi Yang & Jun Hou, 2022. "An NMR-Based Method for Multiphase Methane Characterization in Coals," Energies, MDPI, vol. 15(4), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:4:p:1532-:d:753112
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    References listed on IDEAS

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    1. Mateusz Kudasik & Norbert Skoczylas & Anna Pajdak, 2017. "The Repeatability of Sorption Processes Occurring in the Coal-Methane System during Multiple Measurement Series," Energies, MDPI, vol. 10(5), pages 1-15, May.
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