Maddinelli G, Brancolini A
Eniricerche S.p.A, Milano, Italy.
Magn Reson Imaging. 1996;14(7-8):915-7. doi: 10.1016/s0730-725x(96)00181-6.
NMR imaging has shown itself to be an important tool for improving analysis of flow behaviour during waterflooding in heterogeneous cores. Waterflooding is a widely employed technique in enhancing oil and gas recovery. However the success of such a process could be considerably reduced by instability of the displacing front with negative effects on production efficiency. MRI can be easily applied in evaluating the flow advancement because of its ability to distinguish different phases during dynamic experiments. In our study we have evaluated the shape of the displacing front during water injection in highly heterogeneous reservoir carbonates. The effect of petrographical heterogeneities which strongly characterize the rocks, revealed a marked influence on flow behaviour. Viscosity increase by polymer addition, in spite of a more favourable mobility ratio, resulted in a poorer performance because of higher channelling effects. The results of selected simulation experiments are discussed.
核磁共振成像已证明自身是一种重要工具，可用于改进对非均质岩心中注水过程中流动行为的分析。注水是提高油气采收率广泛采用的技术。然而，驱替前缘的不稳定性会严重降低该过程的成功率，对生产效率产生负面影响。由于磁共振成像（MRI）在动态实验中能够区分不同相，因此可轻松用于评估流动推进情况。在我们的研究中，我们评估了在高度非均质的储层碳酸盐岩中注水期间驱替前缘的形状。岩石强烈特征化的岩相非均质性对流动行为显示出显著影响。尽管聚合物添加使黏度增加，流动比更有利，但由于更高的窜流效应，导致性能更差。讨论了所选模拟实验的结果。
