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OALib Journal期刊
ISSN: 2333-9721
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页岩气藏综合渗流模型及压力动态分析
Keywords: 页岩气,解吸,扩散,窜流,储容比,压裂水平井,压力动态
Abstract:
？区别于常规气藏，页岩气藏渗流主要受解吸、扩散、窜流和常规达西流动控制，机理复杂。考虑到基质和裂缝系统之间存在的压力差，在将气藏看成是双孔单渗介质的基础上，新增加了一个扩散以外的窜流流动，通过引入2个新的参数分别表征扩散和窜流2个因素的影响，建立了页岩气藏含有多条横向裂缝的压裂水平井的渗流数学模型。在此基础上，基于源函数理论，采用镜像反应和叠加原理，得到了地层中任意一点的压力表达式，通过laplace变换和stehfest数值反演得到水平井井底压力解，绘制了不同条件下的压力动态曲线，并与目前存在的渗流数学模型进行了对比，为页岩气藏的试井分析和不稳态产能评价提供了理论依据。
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