Prediction for Isothermal Adsorption Curve of Coal/CH4 Based on Adsorption Heat Theory
Received date: 2014-04-14
Online published: 2015-01-10
Methane adsorption characteristics in coal play an important role in the gas content estimation and gas productivity prediction in coal-bed,but there are differences of methane adsorption isotherms at different temperatures,so many adsorption isotherms need to test at each temperature,which will cause high cost and long time.According to the metamorphic grade of coal,anthracite coal,lean coal and gas-fat coal were chosen as test coal samples.Gas adsorption tests,which relied on high/low temperature adsorption experiment device,were carried out at 30℃,20℃,-10℃,-20℃ and -30℃ to study anatomic features of methane adsorption characteristic curves.And with adsorption heat theory the gas adsorption isotherms of different coal rank were predicted in the high/low temperature environment.The experimental results show that with the decrease of environmental temperature,the gas adsorption capacity of different coal rank all increase.The isosteric adsorption heat of different coal rank has good linear relationships with the isothermal adsorption quantity.The prediction values of gas adsorption quantity with adsorption heat theory agree well with the experimental results,whose error is less than 2%.With little measured data of isothermal adsorption tests,the method of adsorption heat theory can accurately predict the adsorption ability of coal at different temperature and pressure,which will greatly reduce the workload and provide an important basis to study the coal reservoir adsorption properties.
YUE Gao-wei，WANG Zhao-feng，KANG Bo . Prediction for Isothermal Adsorption Curve of Coal/CH4 Based on Adsorption Heat Theory[J]. Natural Gas Geoscience, 2015 , 26(1) : 148 -153 . DOI: 10.11764/j.issn.1672-1926.2015.01.0148
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