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科技导报  2014 

考虑滑脱效应的欠饱和煤储层渗透率模型

DOI: 10.3981/j.issn.1000-7857.2014.27.009, PP. 56-59

Keywords: 欠饱和煤储层,渗透率模型,滑脱效应,有效应力,基质收缩

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Abstract:

在多孔介质应力-应变本构公式基础上,考虑有效应力效应、基质收缩效应、滑脱效应对煤储层渗透率的影响,建立欠饱和煤储层的渗透率动态模型,以沁水盆地某煤层气田为例,模拟储层压力从初始值降至衰竭压力过程中煤储层渗透率变化,分析模型参数敏感性。结果显示在开发初期,欠饱和煤储层储层渗透率持续下降,储层压力下降至临界解吸压力时,渗透率降至最低点,之后渗透率开始上升;储层压力由初始值下降至临界解吸压力3.80MPa时,渗透率下降至最低值0.186×10-3μm2,之后渗透率开始上升,当储层压力下降至2.77MPa时,渗透率恢复至初始值,储层压力下降至衰竭压力时,渗透率上升至初始值的3.182倍;兰氏体积应变、杨氏模量及滑脱系数参数值越高,储层最终渗透率改善幅度越大,泊松比值越高,储层最终渗透率改善幅度越小;与其他参数相比,兰氏体积应变对煤储层最终渗透率改善的影响最为重要。

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