焦坪矿区低阶煤储层因素对煤层气井产能的影响及敏感性分析

利用CBM-SIM煤层气数值模拟软件,以焦坪矿区低阶煤层为例,研究了煤层厚度、渗透率、含气量、吸附性、储层压力、含气饱和度和临储比等煤储层因素对煤层气井产量的影响。结果表明:气井产量随煤层厚度、渗透率、含气量、Langmuir压力、含气饱和度和临储比的增大而增大,随Langmuir体积的增大而减小;储层压力不影响产气量大小,只改变气井的产气时间;含气饱和度和临储比能更好地反映多个因素变化时的产气量变化。 

Influence of reservoir factors on low-rank coalbed methane well production and sensitivity analysis

Taking low rank coal in Jiaoping mining area for example, the CBM numerical simulation software CBM-SIM was used to study the influence that different coal seam sickness, permeability, gas content, adsorption, reservoir pressure, gas saturation, critical desorption pressure and reservoir pressure ratio will have on CBM well production. The result shows that well production increases with the increase of thickness, permeability, gas content, Langmuir pressure, gas saturation, critical desorption pressure and reservoir pressure ratio, on the contrary, decreases with the increase of Langmuir volume. Reservoir pressure changes only gas producing time and peak time, does not affect well production. Gas saturation, critical desorption pressure and reservoir pressure ratio reflect the changes of well production much better when several factors change.