Comprehensive EOR Technology of Water Flooding at High Water-cut Stage of Longhupao Oilfield

Longhupao Oilfield,which is located in the central depression area(Longuupao—Da'an terrace)of the Songliao Basin,is affected by vertical and areal heterogeneity that lead to rapid water-cut increasing rate and natural decline rate,these suggest that its development effect has become worse year by year.In order to improve the development effect,numerical simulation is adopted to optimize the ways of corresponding adjustment in oil and water wells for various types of remaining oils,and the rational injection-production regulation parameters for reservoirs with different permeability are attained by means of laboratory core flooding.The field application shows that the corresponding adjustment and regulation parameter optimization of injection and production wells can effectively reduce the water-cut increasing and natural decline rates,improve the injection-production profile,and ultimately enhance the reservoir producing degree.