The Change Law about the Coal Matrix Shrinkage during Water-Gas Flow Stages
Received date: 2013-01-16
Revised date: 2013-02-21
Online published: 2013-10-10
It is a fundamental study of permeability′s variation by identifying the change law of the coal matrix shrinkage during water-gas flow stages.Due to the significant influence of surface energy,the effective stress coefficient,modulus of elasticity on the coal matrix shrinkage,according to surface physics-chemistry,fracture and damage mechanics,three mathematical models have been established.Then according to the elastic-plastic mechanics,overlying the three influences,combining the Fanzhuang fracturing and drainage data,the change law of the coal matrix shrinkage during water-gas flow stages was studied and the results show that the coal matrix shrinkage deformation is continual and it gradually increases in nearly logarithmic form.It can be seen that the surface energy and the effective stress coefficient have greater impact on the matrix shrinkage deformation than the modulus of elasticity′s.We should pay attention to the continuous supply when drainage during the water-gas flow stage.
NI Xiao-ming,ZHANG Chong-chong,WANG Yan-bin,WANG Xiang-hao . The Change Law about the Coal Matrix Shrinkage during Water-Gas Flow Stages[J]. Natural Gas Geoscience, 2013 , 24(5) : 1069 -1073 . DOI: 10.11764/j.issn.1672-1926.2013.05.1069
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