Numerical Simulation of Thick Oil-Layer with Ultra-Low Permeability in Changqing Oilfield

Chang 6 oil-layer in Huaqing district of Changqing oilfield is a typical thick oil layer with ultra-low permeability. After 2 years' water flooding development, some of the production wells have been flooded with low oil recovery. Based on the geological model of Huaqing district, the ideal numerical models are established using the nonlinear flow numerical simulation software. Then the characteristics of water flooding development and influence factors are researched. At last, the perforation degree is optimized. The numerical simulation results show that the best perforation degree for positive and inverted rhythm of thick oil layer is 0.2 and 0.4 respectively.