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Experimental Study of the Pore Structure and Permeability of Coal by Acidizing

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  • Bo Zhao

    (College of Resources and Environment Science, Chongqing University, Chongqing 400030, China
    Gas Research Branch, China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China
    State Key Laboratory of The Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Guangcai Wen

    (College of Resources and Environment Science, Chongqing University, Chongqing 400030, China
    Gas Research Branch, China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China
    State Key Laboratory of The Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Haitao Sun

    (Gas Research Branch, China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China
    State Key Laboratory of The Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Xusheng Zhao

    (Gas Research Branch, China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China
    State Key Laboratory of The Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

Abstract

The permeability of coal reservoirs prominently determines methane flow in reservoirs. A large amount of coal reservoirs containing methane, however, have low permeability because pores in reservoirs are sealed. To solve this issue, we investigated the pore structure and permeability law of coal through contrastive analysis of the microstructure and macrostructure before and after acidizing, using ASAP 2020 and triaxial servo-controlled seepage equipment. An analysis of the experimental data revealed the mechanism and the key parameters of acidizing, such as acid mass fraction and acidizing time. In addition, we hold that the optimal mass fraction for the test specimens is about 12~15%. Furthermore, the acid reaction is divided into three stages according to characteristics of the reaction progress. An analysis of the reaction kinetics of “ HCl-HF ” states that the significant factors will impact the process of reaction, like the composition of coal, surface area of the acid-coal reaction, mass fraction of acids, and environment of the reaction system. The results provide a new idea and research method for further enhancing permeability and gas extraction.

Suggested Citation

  • Bo Zhao & Guangcai Wen & Haitao Sun & Xusheng Zhao, 2018. "Experimental Study of the Pore Structure and Permeability of Coal by Acidizing," Energies, MDPI, vol. 11(5), pages 1-15, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1162-:d:144871
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    References listed on IDEAS

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    1. Cai-Ping Lu & Lin-Ming Dou & Nong Zhang & Jun-Hua Xue & Guang-Jian Liu, 2014. "Microseismic and acoustic emission effect on gas outburst hazard triggered by shock wave: a case study," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(3), pages 1715-1731, September.
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    Cited by:

    1. Chaojun Fan & Mingkun Luo & Sheng Li & Haohao Zhang & Zhenhua Yang & Zheng Liu, 2019. "A Thermo-Hydro-Mechanical-Chemical Coupling Model and Its Application in Acid Fracturing Enhanced Coalbed Methane Recovery Simulation," Energies, MDPI, vol. 12(4), pages 1-20, February.

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