“New progress has been made in the study of coal production and migration in the development of coal-bed methane. Experts have revealed the characteristics of its shape, mass concentration and composition by analyzing coal in coal-bed methane wells in Qinshui Basin, introduced shape factors to modify the final settling velocity model, and explored the critical flow rate of migration, providing technical support for the optimization of the production system of coal-bed methane wells and continuous and stable production.”