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应用电阻率测井原理,建立了一套大型露头模型平面流场测量方法。在此基础上利用特低渗透天然砂岩露头制作大型露头模型进行流场分布规律研究。研究表明,对于平行岩样具有非线性渗流特征的大型露头模型,其井网单元内平面流场特征为注入流体沿主流线方向快速突进,但波及范围较小,且存在不流动区,驱替效果较差。分析了不同驱替倍数下流场的变化规律,对比研究了不同因素对流场以及有效驱动的影响。大型露头模型能直观地反映流场动态的变化过程和驱替效果,能够更好地模拟实际油藏渗流规律。
Using resistivity logging principle, a set of large-scale outflow model plane flow field measurement method is established. Based on this, a large-scale outcrop model of ultra-low permeability natural sandstone outcrop was used to study the distribution of flow field. The results show that for the large-scale outcrop model with parallel rock samples with non-linear percolation characteristics, the in-plane flow field in the well pattern is characterized by rapid injection of the injected fluid along the main stream line, but with a small range of spread and non-flow areas, Less effective The variation of the flow field under different flooding times was analyzed. The effects of different factors on the flow field and the effective driving were compared. The large outcrop model can intuitively reflect the changing process of the flow field and the displacement effect, and can better simulate the actual reservoir seepage law.