Block Hade consist of a deep thin sandstone reservoir of two sub-layer reservoirs. The thickness isudabout 1.5 m for each layer. The two-layer “staircase” horizontal well is used for recovery. In orderudto determine water displacement front and edge water movement, tracer test is conducted in theudreservoir. But the cycle of field tracer monitoring is about 150-360 days. This prevented the efficientudmonitoring of waterflood swept area and waterflood advance direction and velocity, after the cycleudof tracer monitoring. Conservation of mass with respect to tracer flow and history performanceudmatching of tracer enabled the study of water-flood front and edge-water advance. The simulation resultudis basically consistent with the monitored field tracer results. Therefore, numerical model can be used toudconduct a longer monitoring period. It can make up for the disadvantage of the complexity of theudtracer monitoring setup, its implementation, and time-consuming monitoring cycle. The water-floodudfront, water-flood swept area, advancing velocity and the predominant water injection direction can beudobtained. Furthermore, it is possible to evaluate and predict the injection-production well interaction andudcan also provide a reliable basis to deploy reasonable flood patterns to enhance oil recovery.
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