Citation

Li B, Li J, Yang K, Ren C, Xu J. China Saf. Sci. J. 2019; 29(11): 14-19.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.11.003

PMID

unavailable

Abstract

In order to study permeability evolution mechanism under coupling effects of proppant and stress during coalbed methane extraction process, a coal adsorption deformation equation was established by using adsorption theory. Then, a permeability model considering proppant and stress was further constructed and verified through test data. The results show that coal adsorption and pore pressure is positively correlated and adsorption-induced deformation also has the same trend. Permeability of coal embedded in proppant is much greater than that in conventional reservoir, among which monolayer has the best anti-reflection effect. Coal permeability would decrease in form of an exponential function as effective stress increases, but will decrease first and then tend to change gently with the increase of pore pressure. Measured values are basically consistent with calculated values of an improved theoretical model as it is used to fit the curve. © 2019 China Safety Science Journal. All rights reserved.

Language: zh