Analysis of solid-liquid-gas interaction in coal reservoirs based on Dubinin-Radushkevich model
Free emission of mine gas bring out serious environmental pollution, and abundance reserves of coalbed methane resource should be exploited, therefore knowledge of coal adsorption characteristic has significance on coalbed methane exploration and development. Method of water injection coal sample preparation and isothermal adsorption experiment were carried out under simulated reservoir condition, using coal samples from Sinkiang, Shandong, Ordos and Qinshui basin in China. The experimental results indicated liquid water in coals has remarkable influence on coalbed methane adsorption. Based on the superficial adsorption potential, the characteristic energy of adsorption and adsorption volume of Dubinin-Radushkevich model, the paper analyzed the adsorption capacity difference of dry, equilibriuM moisture and water injection samples quantitatively and interpreted the essence of solid-liquid-gas interaction for different rank coal sample. The results show that, the superficial adsorption potential and adsorption volume of wetted coal matrix are higher than that of equilibrium moisture sample but lower than dry sample, and the higher wettability leads to the acute changes of the characteristic energy of adsorption for equilibrium moisture and water injection samples with low coal rank. Therefore, the wettability of coal matrix and the adsorption capacity change of wetted coal matrix dominate the difference of solid-liquid-gas interaction for different rank coal samples.
methane adsorption capacity adsorption volume wetted coal matriz
S. X. Sang S. Y. Zhang
School of Mineral Resource and Geoscience, Key Laboratoruy of CBM Resources and Reservoir Formation Process(CUMT), Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
国际会议
徐州
英文
150-155
2009-09-24（万方平台首次上网日期，不代表论文的发表时间）