EXPERIMENTAL STUDY ON HETEROGENEITY 3D MODEL WATER DRIVING REMA INING OIL

In order to comprehend the effect of heterogeneity to recovery percentage, and to do further research, this dissertation firstly uses artificial physical model technique, and establishes different 3D heterogeneous models. Then with the help of constant flow rate method, water driving oil experiment is done. From the experiment, the following findings are acquired:water flooding recovery percentage is highest in vertical heterogeneous model, while it is least in horizontal heterogeneous model. the main reason of too much remaining oil in horizontal heterogeneous model is inter-porosity flow, and after using micro-gel profile control, the swept volume of water flooding can be reformed, and the recovery ratio can be improve remarkably. And then the numerical simulation method is adopted, the process of water driving oil in different 3D model is simulated, and the recovery percentage at different water-cut stage and the distribution of remaining oil is studied. From the simulation, the following findings are acquired:in the water-wet positive rhythm model, the recovery percentage is highest, and the distribution of remaining oil and the water flooding degree are even; whereas in the water-wet negative rhythm model, the remaining oil is centralized in the top low permeability formation. The quantity and distribution of remaining oil are dominated by the type of deposit rhythm, gravity and capillarity force, permeability and water flooding degree.