Ansai Oilfield Long 10 Reservoir Seepage Law Research

After nearly30years continuous exploration, Ansai oilfield made a number of mature technologies of low permeability oilfield water injection development in Chang6reservoir, combined with the exploitation of oilfield characteristics and the development of dynamic. In2007, Ansai oilfield found new low permeability famation Chang10reservoir, which is largely different from Chnag6reservoir. Ansai oilfield has never done systematically research on the development in ChanglO reservoir.Based on the research on reservoir rock characteristics, physical property, pore structure, reservoir heterogeneity, water flooding characteristics, wettability and reservoir sensitivity, the law of the percolation of water injection development was studied with the test data of pressure survey, injection profile, injectivity coefficient, water advance front and tracer location.The following findings are made after research:1Reservoir sensitivities in Chang10reservoir are weak speed-sensitivity to medium weak speed-sensitivity, medium weak water-sensitivity, weak medium water-sensitivity, weak to medium weak-salinity, weak to medium weak alkali-sensitivity, strong to medium acid-sensitivity. Acid system can get better reconstruction effect in Chang10reservoir.2The overall water flooding is in stable condition. Injection profile gets worse because injection pressure increases, uniform water absorption into the reservoir the lower part of the spike-shaped absorbent corresponding wells cut rising faster.3The distribution of water advance front is controlled by sedimentary facies distribution, the direction of high permeability zone, minimal principal stress, the direction of microfracture. The distribution of water advance front is northeast and southwest.4The influence factors of high water-cut are water flooding dominant direction, reservoir heterogeneity, liquid production per unit thickness in oil wells.5Reservoir heterogeneity affects water flushed degree, water flush appears in sediment positive rhythm, potential capacity is in the upper part.The law of the percolation of water injection development is systematically studied, combined with ChanglO reservoir characteristics. It is very important for stable production in Chang10reservoir.