| The study area P is located in the northern part of Ansai Oilfield.The regional geological conditions are complex and the exploration is difficult,but the resources are abundant.With the advancement of oilfield development,there are contradictions such as productivity decline and poor adaptability of well patterns.Understanding the distribution of reservoir fractures and seepage water flooding laws in this area,and conducting research on development technology policies will be of great significance for formulating a reasonable development and adjustment plan and achieving fine reservoir management.Based on the research on reservoir heterogeneity and connectivity,we use logging data to research the correspondence between injection and production of well groups,and divides the study area into three types of effect modes: weak effect,directional effect and uniform effect.Make full use of monitoring and production dynamic data,proposed a comprehensive method for identifying fractures in ultra-low permeability reservoirs,and 92 fractures are identified by this method.By introducing effective displacement factor,completed the accurate evaluation of the pressure displacement system of injection-production wells.Based on the evaluation results of water flooding conditions,the horizontal and vertical water flooding laws of the reservoir and their influencing factors are summarized.According to the development status of the research area,a variety of theoretical methods are used to systematically evaluate the injection and production parameters of the reservoir.Combined with numerical simulation methods,the optimal bottomhole flow pressure in the study area was between 2.6MPa and2.8MPa,the optimal formation pressure keeping level was 110%,the optimal production rate was between 0.95% and 0.99 %,and the optimal injection-production ratio was between 1.3and 1.6.This provides a reliable basis for the formulation of reservoir development adjustment plans. |
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