煤层气井煤粉产出规律特征及主控因素研究

Research on Characteristics and Main Control Factors of Coal Powder Production in Coalbed Methane Wells

针对沁水盆地柿庄南区块煤层气井产粉严重的问题,连续采集20口煤层气井煤粉溶液样品,在实验室测试获取了煤粉浓度、煤粉粒径、煤粉形态和主要成分等煤粉产出特征。通过系统研究煤粉产出特征的影响因素,发现煤粉浓度和煤体结构的相关系数R^(2)为0.707,具有较强的相关性;水平井的煤粉浓度平均值为2.85g/L,定向井的煤粉浓度平均值为0.36g/L,相差了8倍;煤体结构是煤粉产出的主控地质因素,井型是主控工程因素。研究成果为柿庄南区块煤层气产粉规律研究和控粉措施提供了实验数据和理论指导。

To address the serious problem of coal powder production in the Shizhuang South Block of the Qinshui Basin,coal powder solution samples were continuously collected from 20 coalbed methane wells.The coal powder production characteristics,such as concentration,particle size,morphology,and main components,are obtained through laboratory testing.Through systematic research on the influencing fac-tors of coal powder production characteristics,it is found that the correlation coefficient R2 between coal powder concentration and coal body structure is 0.707,indicating a strong correlation;The average con-centration of coal powder in horizontal wells is 2.85g/L,while the average concentration of coal powder in directional wells is 0.36g/L,indicating a difference of 8 times.The coal body structure is the main geological factor controlling the production of coal powder,and the well type is the main engineering fac-tor.The research results provide experimental data and theoretical guidance for studying the coal powder production laws and controlling measures in the coalbed methane wells of Shizhuang South Block.