Influence of Pore Structure Characteristics of Low Permeability Coal on Gas Nonlinear Seepage
Natural Resources Research(2024)
Abstract
Coalbed methane (CBM) mining has always been plagued by low mining efficiency. CBM-rich areas have high mining efficiency, but their formation is affected by CBM seepage. Through on-site mining, it is found that gas seepage in low-permeability areas presents nonlinear characteristics. In this paper, the causes and rules of nonlinear seepage are analyzed. The pore structure characteristic parameters such as pore size distribution, pore proportion and fractal dimension were obtained by nuclear magnetic resonance technology, and the pore structure characteristics of low permeability coal are analyzed. The results showed that the proportion of porosity was 6.30–11.02
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Key words
Low gas permeability coal,Pore structure,Nonlinear flow,Slippage effect,Starting pressure gradient
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