Enhancing Sweep Efficiency Using Streamline Simulation

In many applications, streamline simulation shows particular advantages over finite-difference simulation. By the advantages of streamline simulation such as its ability to display paths of fluid flow and acceleration factor in simulation, the description of flooding process gets more visibility. The communication between wells and flooding area has been represented appropriately. In low permeability reservoirs fracturing has been applied to stimulate. But some of the well patterns are not appropriate to fracture. Through streamline simulation this paper presents that five-spot water flooding pattern does not suit the naturally fractured reservoir. In this study authors show that some artificial fractures even reduce the sweep efficiency. And a practical relationship between the well and row distance and the degree of anisotropy is given. This method has been applied to the z2 reservoir in Daqing Oilfield. The production history of this reservoir is about 2 years. The reservoir is maintained above bubble point so the simulation meets the slight compressibility assumption. New well are placed follow this relationship.