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OALib Journal期刊
ISSN: 2333-9721
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三重介质底水气藏压裂水平井非稳态产能变化规律研究
Keywords: 三重介质气藏,底水边界,压裂水平井,点源,非稳态产能
Abstract:
？针对三重介质底水气藏压裂水平井渗流规律和底水侵入气藏导致气井产能下降的特点，基于溶洞系统和基岩系统中的天然气向裂缝系统窜流，经裂缝系统产出的物理模型，将底水边界视为半滤失边界，建立了该类储层介质的非稳态渗流数学模型，并利用源函数、有限fourier余弦变换和贝塞尔函数的积分方法得到了模型的点源解。在此基础上，采用解析法与数值离散法相结合的半解析方法获得了三重介质底水气藏多级压裂水平井的压力响应和非稳态产能计算模型。利用stehfest数值反演得到了气井非稳态产能随时间的变化关系曲线，分析了气井产能的变化规律，研究了压裂裂缝条数、裂缝半长、裂缝间距、孔—缝和缝—洞的窜流系数及缝洞储容比等参数对气井非稳态产能动态特征的影响。研究方法和结果对合理分析三重介质底水气藏压裂水平井生产动态特征和优化压裂参数设计具有一定的指导意义。
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