基于煤层气井产出煤粉浓度的现场连续监测,采用煤粉浓度监测仪、激光粒度测试仪、反射偏光显微镜、X射线衍射、电子扫描电镜带X射线能谱仪,研究了临汾区块煤层气井排采过程中产出煤粉的浓度、粒度、成分和表面特征,分析了煤粉特征的影响因素,探讨了煤粉产出机理。结果表明:临汾区块平均煤粉浓度随排采阶段的变化趋势是排水降压阶段<憋压排采阶段<气水合采阶段;不同开发层段产出的煤粉浓度变化趋势是单采5号煤<合采5号和8号煤<合采(4+5)号、(8+9)号煤。煤粉颗粒粒径分布范围广,从0.5μm至1 000μm,但大部分集中在100μm以下。煤粉成分以无机矿物和镜质组为主,无机矿物为48.49%,镜质组为32.94%。煤粉中无机矿物以硬石膏、黄铁矿和伊利石为主。将煤粉颗粒分为光滑表面和粗糙表面两种,光滑表面的煤粉颗粒以C元素为主,粗糙表面的煤粉颗粒以Fe、S、O元素为主。煤粉产出与煤中矿物含量、镜质组含量以及构造煤发育程度和排采阶段有关。 Based on the on-site continuous monitoring of pulverized coal concentration in coalbed methane wells, coal concentration monitor, laser particle size analyzer, reflected polarization microscope, X-ray diffraction and scanning electron microscopy with X-ray energy dispersive spectrometer The concentration, particle size, composition and surface characteristics of pulverized coal output during the process of discharge are analyzed. The influencing factors of pulverized coal characteristics are analyzed, and the output mechanism of pulverized coal is discussed. The results show that the trend of average pulverized coal concentration in the Linfen block changes with drainage stage is the stage of drainage step-down and the step of gas-water production; the trend of pulverized coal concentration output from different development zones is single-mining 5 Coal