Application of Numerical Well Testing Technology in Evaluating Water Injection Development Effect of Low-Permeability Reservoirs

To finely evaluate the water injection development effect of the pilot area for injection-production system adjustment, this study takes the injection-production well group in the research area as the research object, applies numerical well testing technology, and comprehensively considers the characteristics of multiphase flow, multi-well interference, complex boundaries, and plane heterogeneity. By establishing geological models and well models, and combining dynamic and static data for parameter fitting, the fine characterization of formation pressure distribution, seepage field distribution, and saturation distribution in the multi-well system is realized. Case analysis shows that numerical well testing can effectively judge inter-well connectivity and identify dominant seepage channels. By simulating the saturation and pressure distribution under different water injection well combinations, it is verified that water injection development has a significant effect on improving oil displacement efficiency and can clearly reflect the difference in water flooding. This research provides a reliable basis for optimizing the injection-production structure and adjusting the development plan, highlighting the core application value of numerical well testing in evaluating the water injection development effect of low-permeability reservoirs.