基于有限体积法的致密油储层数字岩心中流动与传热研究

Flow and Heat Transfer Study on Reconstructed Digital Core of Tight Oil Reservoir Based on FVM

以新疆吉木萨尔致密油储层岩心为研究对象,利用Micro-CT扫描技术并结合先进的图像处理技术建立了具有真实孔隙结构特征的三维数字岩心及孔隙网络模型,统计获取了孔隙与喉道体积及等效直径等特征参数的分布。利用基于有限体积法(FVM)的计算流体力学(CFD)软件ANSYS FLUENT完成了三维数字岩心的渗流模拟并计算获得了岩心内部速度场与温度场的分布情况,得到了复杂孔隙空间不同流动方向的绝对渗透率大小。其微观流场计算结果显示岩心内部存在汇流通道,汇流通道的尺度对岩心不同方向的渗透率具有重要影响。所提供的方法为研究致密储层内的复杂流动与传热问题的研究提供了一种途径。

With Micro-CT scanning and advanced image processing technology, 3D digital core presenting real pore structure and pore network modeling are performed on the core sample drilled from the tight oil reservoir of Jimusaer, and the distribution of the volume and equivalent diameter of pores and throats are acquired by statistical analysis. The CFD software named ANSYS FLUENT, based on Finite Volume Method （FVM）, is used to simulate the flow and heat transfer in the reconstructed pore space, and the absolute permeability in different directions is calculated. A special flow path in the geometry, Convergent Flow Channel, is observed by the streamlines at micro scale, whose size plays an important role in the absolute permeability. In this paper, Micro-CT scanning technology and CFD software ANSYS FLUENT are combined, which is a approach for research on the complex flow and heat transfer in core sample of tight oil reservoir.