Research on Dynamic Control Methods for Fine-Scale Water Injection Zones Based on Seepage Resistance

To address prominent challenges in developing high water cut oilfields—such as significant variations in sandstone water absorption capacity and uneven reservoir mobilization—this paper proposes a dynamic layered water injection method centered on seepage resistance as the core regulatory indicator. Through theoretical derivation, quantitative relationships are established between seepage resistance, liquid absorption ratio, and injection allocation. Combined with numerical simulation analysis, this forms a refined water injection control strategy that dynamically adjusts according to changes in oilfield water cut. Research findings demonstrate that this method effectively improves fluid absorption profiles in heterogeneous reservoirs, promotes balanced displacement across distinct lithologic zones, and thereby suppresses water cut increase rates and production decline. Taking Block D as an example, maintaining inter-zone seepage resistance step difference within the 3–5 range yields optimal development outcomes. This study provides significant reference value and practical insights for the dynamic development of oilfields in high water cut phases.