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Step-by-step CO2 injection pressure for enhanced coal seam gas recovery: A laboratory study

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  • Bai, Gang
  • Su, Jun
  • Li, Xueming
  • Guo, Chunsheng
  • Han, Mingxu
  • Zhou, Xihua
  • Fan, Chaojun

Abstract

With the objective of achieving an ‘emission peak and carbon neutrality’, the injection of CO2 into deep unmineable coal seams or abandoned mines can enhance the methane recovery from coalbeds and can realise CO2 geological sequestration. Traditionally, Constant CO2 injection pressure method（Const-CO2） is expensive and low injection capacity of coal seam. Therefore, this study proposes an SBS-CO2 method that steps the CO2 injection pressure. The results revealed that compared with const-CO2 method, the total recovery rate of CH4 was increased by 9.148% by SBS-CO2 method, with the largest increase (7.933%) in the stage II. The injection-production ratio of SBS-CO2 injection method was always smaller than Const-CO2. At the stage I, CO2 injected amount was reduced by 9.54%. CO2 injection amount of unit mass coal was reduced by 1.211 mL/g. The lower the injection pressure was, the higher was the permeability. In the proposed method, each pressurisation was followed by a temporary recovery in permeability, and the critical CO2 injection time of 140.83 min. The SBS-CO2 injection method can effectively improve the recovery efficiency of coalbed methane and CO2 injection efficiency, greatly reduce the risk of CO2 consumption and outburst, and significantly reduce the injection and time cost.

Suggested Citation

  • Bai, Gang & Su, Jun & Li, Xueming & Guo, Chunsheng & Han, Mingxu & Zhou, Xihua & Fan, Chaojun, 2022. "Step-by-step CO2 injection pressure for enhanced coal seam gas recovery: A laboratory study," Energy, Elsevier, vol. 260(C).
    • Handle: RePEc:eee:energy:v:260:y:2022:i:c:s0360544222020874
    DOI: 10.1016/j.energy.2022.125197
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    References listed on IDEAS

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    1. Bai, Gang & Su, Jun & Zhang, Zunguo & Lan, Anchang & Zhou, Xihua & Gao, Fei & Zhou, Jianbin, 2022. "Effect of CO2 injection on CH4 desorption rate in poor permeability coal seams: An experimental study," Energy, Elsevier, vol. 238(PA).
    2. Liu, Ting & Lin, Baiquan & Fu, Xuehai & Gao, Yabin & Kong, Jia & Zhao, Yang & Song, Haoran, 2020. "Experimental study on gas diffusion dynamics in fractured coal: A better understanding of gas migration in in-situ coal seam," Energy, Elsevier, vol. 195(C).
    3. Fan, Zhanglei & Fan, Gangwei & Zhang, Dongsheng & Zhang, Lei & Zhang, Shuai & Liang, Shuaishuai & Yu, Wei, 2021. "Optimal injection timing and gas mixture proportion for enhancing coalbed methane recovery," Energy, Elsevier, vol. 222(C).
    4. Tupsakhare, Swanand S. & Castaldi, Marco J., 2019. "Efficiency enhancements in methane recovery from natural gas hydrates using injection of CO2/N2 gas mixture simulating in-situ combustion," Applied Energy, Elsevier, vol. 236(C), pages 825-836.
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    3. Bai, Gang & Su, Jun & Fu, Shigen & Li, Xueming & Zhou, Xihua & Wang, Jue & Liu, Zhengdong & Zhang, Xun, 2024. "Effect of CO2 injection on the gas desorption and diffusion kinetics: An experimental study," Energy, Elsevier, vol. 288(C).
    4. Wen, Hu & Mi, Wansheng & Fan, Shixing & Liu, Mingyang & Cheng, Xiaojiao & Wang, Hu, 2023. "Determining the reasonable volume required to inject liquid CO2 into a single hole and displace CH4 within the coal seam in bedding boreholes: case study of SangShuPing coal mine," Energy, Elsevier, vol. 266(C).
    5. Wang, Kai & Wang, Yanhai & Xu, Chao & Guo, Haijun & Xu, Zhiyuan & Liu, Yifu & Dong, Huzi & Ju, Yang, 2023. "Modeling of multi-field gas desorption-diffusion in coal: A new insight into the bidisperse model," Energy, Elsevier, vol. 267(C).

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