ANALYSIS ON OUTPUT STAGE AND PROCESS OF COAL POWDER IN COALBED METHANE WELL

摘要

The coal powder production is one of the most significant phenomenon in coal bed methane exploitation. Its generation, immigration and production in reservoir severely plague the success of efficient exploitation of coal bed methane. Recently, there is few literature or further study researching the production stage, physical procedure and mechanism of coal powder production. However, these studies are important for the establishment gas-liquid-solid flow model with coal powder immigration and the quantitative analysis of coal powder influence on gas well. Therefore, the powder coal from the Qinshui Basin is researched in this paper. Finally, based on the gas well production stage, the coal powder type and production procedure is divided by the rock stress-strain theory. Meantime, each coal powder production stage is analysed with core displacement experiment.