Characterization and Dynamic Adjustment of the Flow Field during the Late Stage of Waterflooding in Strongly Heterogeneous Reservoirs

The flow field is the fluid dynamic path in strongly heterogeneous reservoirs, and its evolution significantly affects distribution of remaining oil, showing a disordered highly dispersed mode caused by long-time water injection. By combining traditional flow-field evaluation with diagnostics, this paper proposes methodology to quantitatively characterize adjust real time during late stage waterflooding reservoirs. In study, velocity, abundance predominant Lorenz coefficient are preferred as characteristic parameters evaluate effect reservoir heterogeneity on field. Taking minimization Lorentz objective function, optimal injection production obtained adjusting results show that continues, shape variation jointly influenced rhythm, vertical permeability contrast, lateral distribution. larger greater influence When contrast large, depends Finally, method applied an actual reservoir, better oil increase reduction achieved.