Study on Water-Driving Law and Remaining Oil Distribution Pattern in Ultra-low Permeability Reservoir

The water-cut rises quickly and the remaining oil distribution is complex when ultra-low permeability reservoir enters high water cut stage. comprehensive use of engineering, dynamic monitoring, numerical simulation, core experiments other methods, this paper systematically summarizes three types water-driving law characteristics oil, which are pore-fracture flow, flow fracture flow. It considered that horizontal drive mainly controlled by material source, well pattern fracture, while vertical heterogeneity, line distance, injection-production etc. , patterns residual formed different percolation different, in paper, 7 macroscopic distribution, such as control, heterogeneity single sand body connected longitudinal interference, non-correspondence non-main unutilized, summarized, light patterns, puts forward adjustment direction tapping potential, optimizing structure, mode.