Characteristics of Oil-Water Relative Permeability and Influence Mechanism in Fractured-Vuggy Medium

The fracture system of fractured-vuggy reservoir is dominated by orthogonal fracture, and the vug system develops along the fracture. In view of this characteristic, two different kinds of models were made in this paper: the fracture medium model and the fractured-vuggy medium model. A series of two-phase fluid flow experiments were conducted to obtain the relative permeability curves. The results show that the oil and water relative permeability curves have a regular alternative relation of growing and declining, while the percolation resistance changes little, which indicates that there is no Jamin action that caused by the complexity of pore structure. Fracture aperture, fracture network structure, vug density and vug porosity have different influence on the relative permeability characteristic of fractured-vuggy medium, and the influence shows a obvious regularity.