Research On Water Flooding Characteristic And Reasonable Adjustment Method In Xingnan Development Block

Researching the adjusting boundaries of the technique and tacties has most guiding significance for the adjustment of the exploitation plan.Based on the wells' geologic information sufficiently collected in steam-flood experimental area of Xingnan oil field and combined with the digitized precipitation facies, the structural model and property model with porosity, permesbility, oil saturation and effective thickness is established by using the three-dimensional geological modeling software of GPTmap in this thesis. The numerical simulation software Eclipse is applied to match the development index in the period of waterflooding, including the geological reserves, composite water cut, individual well water cut, degree of reserve recovery, pressure and so on. On the basis of meeting the accurate history matching, summarizing the waterflooding characteristic of different development stages for different sedimentation type and the final recovery ratio of different sedimentation type was forecasted through them. Through the theoretical research on reservoir declining combined with actual production, verifying the declining production follows hyperbolically decline of n=0.5, and identifying the empirical formula of different sedimentation type. Following the principle of material conservation, three-dimensional curve of the relation between pressure changes and difference of fluid injection and production was returned by using Matlab software; the empirical formula among injection pressure, production pressure and stratum pressure was ensured. Using of reservoir engineering theory and the results of numerical simulation, it ascertains the reasonable injection-production ratio, production rate and flow pressure under different water cut of different sedimentation type. Finally the empirical formula of reasonable water injection pressure and the research method of permeability differential were ensured. They provide reliable basis for designing adjusting plan of reservoir exploitation.