Seepage Field Adjustment for Enhanced Oil Recovery in High Water Cut Oilfield

An oilfield has been developed with water-flooding for a long time, and the water cut has reached a high level. The seepage law of reservoir becomes more and more complicated, the remaining oil is highly dispersed, and the ineffective circulation of injected water is serious. Enhancing oil recovery is faced with severe challenges. In order to accurately describe the high water cut reservoir potential and improve the development effect, this paper puts forward the “three six parameters” seepage multi-level quantitative characterization method, realizes the quantitative description of reservoir drive control ability, production potential and efficiency driving force. On the basis of production practices, this paper establishes indexes for evaluating the classification of seepage field, and forms five potential zones, implements five differentiated regulatory models, “well group collaboration, reservoir recombination, dynamic injection separation, injection-production coupling, and flow degree alternation”, and guides the adjustment of high water-cut oil fields. The practical results of typical blocks show that, the seepage field characterization, evaluation and differential control method can greatly improve the accuracy of the description of residual potential and the accuracy of flow field control in high-water-cut fault-block oil fields, so as to improve the development effect and further enhance the recovery factor.