Stress-seepage hydro-mechanical coupling model of coal-bed methane reservoir and its SPH analysis
Received date: 2016-01-27
Revised date: 2016-12-01
Online published: 2017-02-10
Numerical simulation is a significantly important method for the dynamic analysis of coal-bed methane reservoir and gas production.This paper proposed a stress-seepage hydro-mechanical model for coal-bed methane reservoir that was considered as dual permeability media of matrix pore and fracture.At the same time,the influence of the deformation of coal-bed on the gas seepage field was considered.The model involved the effects of coal-bed methane’s adsorption and desorption,the coupling of stress-seepage,and other factors on the coal bed methane extraction.SPH (Smoothed Particles Hydrodynamics) method was used to discretize the governing equations,and thus corresponding SPH code was made.A numerical example was presented using the proposed model and field coal bed parameters.The model is used to solve and analyze the process of coal bed methane desorption and the change of permeability.The SPH method can be applied to the study of coalbed methane desorption and seepage process and the dynamic analysis of coalbed gas reservoir.Results show that the matrix permeability and fracture permeability are influenced obviously by effective stress.Considering the adsorption and desorption of coal-bed methane are more realistic in the process of the coal-bed methane seepage,which is needed in the reasonable estimation of the amount of gas emission during the actual gas production process.
Sun Chao-qun,Li Shu-cai,Li Hua-luan,Cui Wei,Song Shu-guang . Stress-seepage hydro-mechanical coupling model of coal-bed methane reservoir and its SPH analysis[J]. Natural Gas Geoscience, 2017 , 28(2) : 305 -312 . DOI: 10.11764/j.issn.1672-1926.2016.12.012
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