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    Electrochemical Modification on CH4 and H2O Wettability of Qinshui Anthracite Coal: A Combined Experimental and Molecular Dynamics Simulation Study

    Year: 2021

    Journal: ACS Omega, Volume 6, SEP 21, page 24147–24155

    Authors: Zhang, Xiaoyu; Cheng, Jian; Kang, Tianhe; Zhou, Xianxian; Zhang, Liankun

    Organizations: National Natural Science Foundation of China [61973305, U1810102]; Shanxi Applied Basic Research Program, Youth Science and Technology Research Foundation [2019010D211033]; Liaoning Provincial Natural Science Foundation [2020-KF-22-02]; Beijing Science and Technology Project [Z201100004520015]; Tiandi Technology Co., Ltd., Science and Technology Innovation and Entrepreneurship Fund Special Industry-University Research Science and Technology Cooperation Project [2020-2-TD-CXY006]; special key projects of Science and Technology Innovation and Entrepreneurship Fund of China Coal Science and Industry Group [2019-2-ZD002]

    The wettability of gas and liquid on the coal surface is one of the fundamental factors that affect the depressurization process during the coalbed methane (CBM) extraction. The wettability of coal surface changed after electrochemical modification, leading to the change in methane adsorption/desorption and water movement in coal reservoirs. Thus, the CH4 adsorption amount, desorption ratio, and coal-water contact angle of raw and modified anthracite samples were measured and simulated. The mechanism of electrochemical modification was analyzed by functional groups, surface free energy, pore characteristics, interaction energies, and coal swelling. The experimental results showed that the saturated adsorption amount of methane decreased from 41.49 to 34.72 mL/g, and the simulation results showed that the saturated adsorption amount of methane decreased from 2.01 to 1.83 mmol/g. The coal-water contact angle also decreased from 81.9 to 68.6 degrees. Electrochemical modification mainly affects the wettability of CH4 and H2O by changing the functional groups and pore structures of anthracite, and the influence on functional groups of coal surface is greater. This work provided a basis for enhancing CBM extraction by electrochemical modification.
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