Research on the method of improving water-flooding effect for the reservoirs with plane heterogeneity

If the reservoirs with plane heterogeneity are developed by using conventional five-spot well pattern with equal-well-space, the injected water preferentially fingers along the high permeability direction, which causes significant difference of water breakthrough times for production wells in different directions, and results in unbalanced displacement, consequently affects the effects of reservoir development seriously. The design formula for well space of vectorial well pattern for the reservoirs with plane heterogeneity is derived based on porous flow theory. According to the well space formula of vectorial well pattern, the physical models are made to carry out the contrastive water flooding experiment which is used to demonstrate the validity of vectorial well pattern. The results indicate that the vectorial well pattern can improve the plane sweep factor for the reservoirs with permeability heterogeneity, and raise the efficiency of injected water, moreover, it can improve the developing effect greatly.