摘要
Abstract
The study of coalbed methane diffusion characteristics is of great significance for improving coalbed methane yield and reducing mine gas disasters.Based on the achievements of domestic and foreign scholars in the field of coalbed methane diffusion,a systematic study is conducted from three aspects,such as coalbed methane diffusion models,diffusion experiments,and diffusion control factors,etc.The results show that the single hole diffusion model based on Fick's law cannot describe the entire process of adsorption/desorption diffusion,while the dual hole diffusion model,porous diffusion model,and dynamic diffusion model based on time variation can better explain the diffusion characteristics;the manometry method and mass method are used to obtain the adsorption diffusion coefficient,while the volume method is used to obtain the desorption diffusion coefficien,choosing a suitable diffusion model to fit experimental data is the key to obtaining the diffusion coefficient;the diffusion characteristics of coalbed methane are mainly controlled by coal rank,pore structure,coal rock moisture,temperature,pressure,and particle size.Exploring the law of diffusion coefficient changing with time,quantifying diffusion models with different hole sizes,and clarifying the joint mechanism of diffusion and seepage flow are the development trends in this research field.关键词
煤层气/扩散模型/吸附/解吸/扩散系数/渗流Key words
coalbed methane/diffusion model/adsorption/desorption/diffusion coefficient/seepage flow分类
天文与地球科学
