Dynamic settlement law of coal powder during single-phase flow stage of coalbed methane wellbore
HU Hao
KONG Peng
LIU Guangjing
ZHANG Yafei
ZHANG Xiaofei
ZHANG Jintao
REN Junshan
ZHANG Zhou
Abstract：In response to the severe problem of coal powder production in some coalbed methane wells during the development pro-cess of coalbed methane,a set of coal powder dynamic settlement experimental platform as been developed;based on the on-site pro-duction conditions of coalbed methane wells and the characteristics of coal powder production,experimental conditions were de-signed to meet the on-site production characteristics,and the migration and settlement laws of coal powder in the unidirectional flow stage of coalbed methane wells were explored.The results show that the tuning fork resonant density sensor can achieve real-time monitoring of underground coal powder mass concentration;180-250 μm coal powder particles will be carried and transported when the fluid velocity is greater than or equal to 0.020 m/s;150-180 μm coal powder particles will be carried and transported when the fluid velocity is greater than or equal to 0.010 m/s.When the mass concentration of coal powder is constant,the increase in flow rate will cause the increase in the mass concentration of coal powder in the wellbore,which proves that the increase of drainage speed is helpful to discharge the settled coal from the shaft.
Keywords：coalbed methane wellcharacteristic of coal powder productioncoal powder sedimentationsingle phase flowcoal dust migrationtuning fork
Publication Date：2025-02-19
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 81-86 )