张春光;姜瑞忠;乔欣;崔永正;沈泽阳;张福蕾;原建伟;

• 1:中国石油大学(华东)石油工程学院

• 2:中国石油北京油气调控中心

摘要(Abstract)：

经典渗流理论描述双重介质致密气藏的非均质性与多尺度特征具有局限性。应用分形理论描述裂缝系统的应力敏感性及分形特征,考虑边界层及屈服应力的影响描述致密基质块的渗流特性,建立存在启动压力梯度的双重介质致密分形气藏水平井非线性渗流模型。利用等价压力点处理内边界条件,应用有限元方法求解渗流模型;绘制井底压力动态曲线,将渗流过程划分7个流动阶段。对比不同模型的渗流特点,对非线性参数、水平井长度及分形指数进行敏感性分析。结果表明:分形非线性模型综合考虑储层非均质性对渗流的影响,更贴近实际储层。非线性增强导致窜流延迟且强度减弱;水平井增长使窜流出现时间延迟;分形指数增大影响曲线在中后期流动阶段的上翘程度。该结果对双重介质致密气藏的试井参数解释及水平井井底压力动态特征评估具有实际意义。

关键词(KeyWords)：双重介质;致密气藏;启动压力梯度;分形理论;非线性;水平井压力动态

Abstract:

Keywords:

基金项目(Foundation):国家科技重大专项(2016ZX05027-004-004,2017ZX05013-002);; 国家自然科学基金项目(51574265)

作者(Author):张春光;姜瑞忠;乔欣;崔永正;沈泽阳;张福蕾;原建伟;

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