岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 149156.doi: 10.12108/yxyqc.20190416
姜瑞忠1, 张福蕾1, 崔永正1, 潘红2, 张旭1, 张春光1, 沈泽阳1
JIANG Ruizhong1, ZHANG Fulei1, CUI Yongzheng1, PAN Hong2, ZHANG Xu1, ZHANG Chunguang1, SHEN Zeyang1
摘要: 页岩气藏渗透率极低,储层存在很强的应力敏感性,所以需对其进行水力压裂。通过分析吸附解吸、Knudsen扩散、非稳态窜流和渗流等多种气体运移机制来建立页岩气藏复合模型,采用Mathieu函数、Pedrosa变量代换、正则摄动理论、拉普拉斯变换和Stehfest数值反演等方法来求解数学模型,并绘制出无因次拟压力曲线,同时对渗透率模量、SRV半径、外区裂缝渗透率、扩散系数和解吸压缩系数等相关参数进行敏感性分析。结果显示:气体流动阶段可划分为9段,渗透率模量的增加导致气井定产量生产时所需压差增大,而SRV半径和解吸压缩系数的增大使得压差减小;较大的外区裂缝渗透率与较小的流度比相对应,扩散系数越大,页岩基质表观渗透率越大,窜流发生的越早。提出的试井模型可提高页岩气藏压力动态分析的准确性,对压裂开发页岩气藏具有一定的理论指导意义。
中图分类号:
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