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工程力学  2014 

侵入型火成岩对煤层气水平井产能影响的研究

, PP. 245-251

Keywords: 煤层气,水平井排采,侵入型火成岩,压力分布,产能

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Abstract:

选取具有复杂地质条件的阜新刘家煤层气区块为研究对象,建立气体解吸、扩散、排采过程中压力改变引起孔隙度、渗透率动态变化的双重系统渗流模型,并建立包含复杂地质构造的非均质煤层气藏地质模型,分析火成岩侵入对水平井产能影响。分析结果表明:煤层气藏储层压力扩展受复杂地质构造影响明显;在两条火成岩之间设置水平井SPJ1,中间位置煤层气解吸面积和储层压降漏斗影响范围最大,压力下降更充分;在火成岩以及断层之间设置水平井SPJ2,既要考虑削弱断层影响,又要与北侧火成岩距离适中,模拟得出距离火成岩140m最合理,压降漏斗下降幅度大,漏斗范围内煤层气采出量最充分。对比分析SPJ1与SPJ2发现,在刘家区所选区块应在SPJ2位置建水平井。

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