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Effect of CO2 injection on CH4 desorption rate in poor permeability coal seams: An experimental study

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  • Bai, Gang
  • Su, Jun
  • Zhang, Zunguo
  • Lan, Anchang
  • Zhou, Xihua
  • Gao, Fei
  • Zhou, Jianbin

Abstract

CO2 injection into coal seams is an effective way for reducing greenhouse gas emissions and increasing gas recovery in coal seams. To study the influence rule of CO2 injection on the CH4 desorption rate, an experimental system of CO2 displacing CH4 was used to analyse the changes in gas composition, outlet flow rate, coal seam temperature, and displacement efficiency parameters during CO2 injection. From the perspective of enhancing CH4 recovery, the CO2 critical injection amount (Vinc) is 297.4 L and critical injection time is 188.75 min. When the CO2 injection amount V < Vinc, the amount of CH4 desorption, CO2 storage, and CH4/CO2 gas content all increased. When V > Vinc, except CH4 desorption amount remained almost unchanged, the other parameters increased. In the process of CO2 displacing CH4, the coal seam temperature rises (exothermic process), showing a law of “hierarchical displacement”. With the injection of CO2, the pore pressure first decreased and then increased, the CH4 partial pressure decreased, and the effective diffusion coefficient first increased and then decreased. After the injection of CO2, the desorption time of CH4 was 269.45min earlier and the desorption rate of CH4 was increased by 12.43 %.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pa:s0360544221019228
    DOI: 10.1016/j.energy.2021.121674
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    References listed on IDEAS

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    2. Liu, Huang & Yao, Desong & Yang, Bowen & Li, Huashi & Guo, Ping & Du, Jianfen & Wang, Jian & Yang, Shuokong & Wen, Lianhui, 2022. "Experimental investigation on the mechanism of low permeability natural gas extraction accompanied by carbon dioxide sequestration," Energy, Elsevier, vol. 253(C).
    3. Geng, Weile & Huang, Gun & Guo, Shengli & Jiang, Changbao & Dong, Ziwen & Wang, Wensong, 2022. "Influence of long-term CH4 and CO2 treatment on the pore structure and mechanical strength characteristics of Baijiao coal," Energy, Elsevier, vol. 242(C).
    4. Bai, Gang & Zhou, Zhongjie & Wang, Jue & Tian, Xiangliang & Zhou, Xihua & Li, Xianlin & Chen, Ying, 2023. "Experimental study on damage law of liquid CO2 cyclic freeze–thaw coal," Energy, Elsevier, vol. 284(C).
    5. Gao, Qi & Han, Songcai & Cheng, Yuanfang & Shi, Xian & Yan, Chuanliang & Han, Zhongying, 2022. "Flow-coupled-geomechanical modelling of CO2 transport in depleted shale from a microscopic perspective," Energy, Elsevier, vol. 257(C).
    6. Liu, Zhengdong & Lin, Xiaosong & Zhu, Wancheng & Hu, Ze & Hao, Congmeng & Su, Weiwei & Bai, Gang, 2023. "Effects of coal permeability rebound and recovery phenomenon on CO2 storage capacity under different coalbed temperature conditions during CO2-ECBM process," Energy, Elsevier, vol. 284(C).
    7. Zhou, Lijun & Zhou, Xihua & Fan, Chaojun & Bai, Gang, 2022. "Coal permeability evolution triggered by variable injection parameters during gas mixture enhanced methane recovery," Energy, Elsevier, vol. 252(C).
    8. 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).
    9. Zhang, Chaolin & Wang, Enyuan & Li, Bobo & Kong, Xiangguo & Xu, Jiang & Peng, Shoujian & Chen, Yuexia, 2023. "Laboratory experiments of CO2-enhanced coalbed methane recovery considering CO2 sequestration in a coal seam," Energy, Elsevier, vol. 262(PA).
    10. Wang, Zhenzhi & Fu, Xuehai & Pan, Jienan & Deng, Ze, 2023. "Effect of N2/CO2 injection and alternate injection on volume swelling/shrinkage strain of coal," Energy, Elsevier, vol. 275(C).
    11. 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).
    12. Pang, Mingkun & Zhang, Tianjun & Ji, Xiang & Wu, Jinyu & Song, Shuang, 2022. "Measurement of the coefficient of seepage characteristics in pore-crushed coal bodies around gas extraction boreholes," Energy, Elsevier, vol. 254(PA).
    13. Zhou, Yan & Guan, Wei & Cong, Peichao & Sun, Qiji, 2022. "Effects of heterogeneous pore closure on the permeability of coal involving adsorption-induced swelling: A micro pore-scale simulation," Energy, Elsevier, vol. 258(C).

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