| Popis: |
According to the 4 dimensionless parameters proposed by Djuro Novakovic, which are the ratio of length to height along displacement direction, the mobility ratio at endpoint, the gravity number and the capillary number, the quantitative limits can be obtained of viscous force, gravity and capillary force, respectively. With the typical models under different dominant driving forces, the development rules of water flooding were studied. Based on the actual formation attributes of the reservoir, the typical model was established, which was three dimensions (350 m × 350 m × 15 m) and three phases (oil, gas and water). And then, the influence of the dip angle, the aquifer and well pattern on the development effect was studied. It was indicated that, when the gravity was dominant, the degree of water flooding was relatively higher at the bottom of reservoir, but at the top, the sweep coefficient was smaller and in the plane the sweep efficiency was more uniform. While when the viscous force was dominant, the sweep efficiency in vertical direction was better than that in gravity case, but in the plane there appeared a more serious fingering phenomenon. Under the control of the capillary force, the sweep efficiency in vertical direction was the highest, and that in plane was also better than the viscous force case, which was basically consistent with the gravity case. Through the analysis of driving energy and driving mode, the rule of the water producing and its influencing factors of the target reservoir were clarified, and the influence of the loss of injected water on the reservoir development was summarized under the condition of the existence of the edge and bottom water. In the following development and adjustment, in order to make the development scheme, we should take gravity as the dominant factor, consider the interaction between the injected water and the natural aquifer, and combine the optimized results of well pattern for injection-production. |
