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科技导报  2015 

煤层气藏三孔双渗直井井底压力响应数学模型

DOI: 10.3981/j.issn.1000-7857.2015.18.004, PP. 28-33

Keywords: 煤层气,三孔双渗,解吸/吸附,井底压力

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Abstract:

国内煤岩储层压力和渗透率普遍偏低,目前矿场主要采用注入/压降测试方法来求取地层参数,但由于注入水无法进入基质孔隙,测试数据无法反映基质解吸特征。针对这一问题,本文建立能够真实反映煤层气藏地层参数的三孔双渗渗流数学模型,利用拉氏变换和Stehfest数值反演方法对模型进行求解,获取不同边界条件(径向无限大、外边界定压以及外边界封闭)下的直井井底拉氏空间拟压力解析解,绘制无因次拟压力和无因次拟压力导数与无因次时间的双对数曲线,并根据曲线特征对三孔双渗煤岩储层直井渗流阶段进行划分,对影响井底压力响应特征的关键参数进行分析,为煤层气的试井精细解释提供理论依据。

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