煤层气井产气规律及产能影响因素分析

煤层气是一种重要的非常规资源。煤层气的开采首先需要将储层中的水排出,降低储层压力使吸附气解吸产出。采用数值模拟方法分析了煤层气压降开采过程,并利用实际储层特征建立地质模型,对单井生产历史进行拟合,拟合效果较好。应用上述所建立的模型分析了裂缝渗透率、孔隙度以及最小井底流压对煤层气井产气变化规律以及峰值时间的影响。

Analysis of Production Rule and Productivity Influencing Factors of Coalbed Methane

Coalbed methane (CBM) is an important unconventional resource. The exploitation of coalbed methane (CBM) must reduce reservoir pressure making adsorbed gas desorption through depressurization. The coalbed methane pressure dropping process was analyzed by numerical simulation. Based on the actual reservoir characteristics, the geological model was established. The single well production history was well matched. Using the above model, the effect of fracture permeability, porosity and the bottom hole flowing pressure on coalbed methane production and peak time was analyzed.