Characteristics of Coal Matrix Compressibility: An Investigation by Mercury Intrusion Porosimetry

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• 作者：Xiaoqian Guo ; Yanbin Yao ; Dameng Liu
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：June 19, 2014
• 年：2014
• 卷：28
• 期：6
• 页码：3673-3678
• 全文大小：345K
• 年卷期：v.28,no.6(June 19, 2014)
• ISSN：1520-5029

文摘

Coal matrix compressibility caused by a pressure change is an important parameter in evaluating the permeability change during coalbed methane production. In this study, the pressure-driven coal matrix compressibility for 21 coals in the rank range from high-volatile A bituminous (0.65% R_o,m) to low-volatile bituminous (1.77% R_o,m) was evaluated by combining the results from mercury intrusion porosimetry (MIP) with N₂ adsorption analysis. The pressure interval was chosen to be from 7.35 MPa to ensure that the compression is totally from the coal matrix. The calculated coal matrix compressibility shows a U-shaped relationship with increasing coal rank, and it obtains relatively low values at the medium-volatile bituminous coals. The coal matrix compressibility of high-volatile A bituminous coals is of 1.6398鈥?.9060 脳 10^鈥? MPa^鈥?, and medium- and low-volatile bituminous coals have coal matrix compressibility of 0.3451鈥?.5519 脳 10^鈥? and 0.7625鈥?.5554 脳 10^鈥? MPa^鈥?, respectively. Moreover, with the data of petrographic and proximate analyses, the porosity, moisture content, and macerals have influence on coal matrix compressibility.