Study on Key Parameters for Jet Impacting Pulverized Coal Deposited in Coal-Bed Methane Wells

Cleaning out the pulverized coal deposited at bottom of a coalbed methane (CBM) well is key to achieving continuous CBM drainage and prolonging workover period. In this study, Fluent used in conjunction with standard k-? model Eulerian-Eulerian simulate analyse jet erosion particles. The depth width stable pit that formed by jet-impacting under different conditions are determined provide theoretical basis for cleanout well. paper, three parameters target distance, nozzle diameter outlet flow velocity selected perform an orthogonal simulation. change trends scouring time determined. results show impacting can be categorised into four stages, periods rapid growth, stability, swing dynamic stability. A sensitivity analysis shows has strongest influence on among parameters. impact reach maximum t = 3 s, while after 7 s. This design operation. It great significance capacity damage control during