Experimental study on different water flooding methods for fractured-vuggy reservoir based on 3D printing

To study the distribution of residual oil after water flooding and the effectiveness of improved water flooding, the 3D printer was used to print the 3D model to imitate the fractured-vuggy reservoir modles of Tahe Oilfield. The purpose of this paper is to quantitatively describe the distribution of the remaining oil, study the mechanism of different improved water flooding methods, and provide theoretical support and technical support for further study of oil recovery. The experimental results of the three-dimensional model show that the remaining oil in such fracture-cavity reservoirs mainly exists at the top of the structure and the corners of the cave model, as well as the injection wells and the raised centers of the model.The remaining oil at the injection well can be produced after the injection-production inversion. After gas injection, the oil at the top of the model and the raised centers can be produced, indicating that changing the water flooding method can increase the oil production of the well.