IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v15y2022i4p1532-d753112.html
   My bibliography  Save this article

An NMR-Based Method for Multiphase Methane Characterization in Coals

Author

Listed:
  • 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
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/15/4/1532/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/15/4/1532/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    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.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Katarzyna Godyń & Barbara Dutka & Monika Chuchro & Mariusz Młynarczuk, 2020. "Synergy of Parameters Determining the Optimal Properties of Coal as a Natural Sorbent," Energies, MDPI, vol. 13(8), pages 1-17, April.
    2. Sijian Zheng & Yanbin Yao & Shasha Zhang & Yong Liu & Jinhui Yang, 2019. "Insights into Multifractal Characterization of Coals by Mercury Intrusion Porosimetry," Energies, MDPI, vol. 12(24), pages 1-18, December.
    3. Norbert Skoczylas & Anna Pajdak & Mariusz Młynarczuk, 2019. "CO 2 Adsorption–Desorption Kinetics from the Plane Sheet of Hard Coal and Associated Shrinkage of the Material," Energies, MDPI, vol. 12(20), pages 1-20, October.
    4. Skoczylas Norbert & Anna Pajdak & Katarzyna Kozieł & Leticia Teixeira Palla Braga, 2019. "Methane Emission during Gas and Rock Outburst on the Basis of the Unipore Model," Energies, MDPI, vol. 12(10), pages 1-22, May.
    5. Paweł Baran & Katarzyna Czerw & Bogdan Samojeden & Natalia Czuma & Katarzyna Zarębska, 2018. "The Influence of Temperature on the Expansion of a Hard Coal-Gas System," Energies, MDPI, vol. 11(10), pages 1-10, October.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:15:y:2022:i:4:p:1532-:d:753112. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.