Research On The Water Injection In The High Water-cut Stage Of Chao 45 Stage

This paper has analyzed the actual stratified data and development status of C45 block by researching the date Chaoyang Gou oil field.Combined with reservoir physical properties,water injection effect and pressure distribution characteristics,this paper has ressearched the application of C45.Based on the numerical simulation and building geologic model of C45,it has researched the distribution of residual oil,saw the rational injection volume for different types of water absorption thickness,and established water injection subdivision standard.And it has calculated upper limit of water injection based on the limit of water sensitivity.According to the basic unit of separate injection interval and the principle of material balance,it has researched the reasonable injection intensity.The research results show that the 45 block ?class with a high degree of formation and ?,?degree of reservoir sand body control is poor,low degree of the reservoir.According to the ratio of injection intensity in old and new Wells,the optimal injection ratio is 1.1 in the 60-80% water-bearing stage and 1.0 in the 80-90% water-bearing stage.According to the results of core velocity sensitivity test,the upper limit of water injection intensity in the heading 45 block is 2.55m3/d.m.According to the residual oil distribution characteristics of the block,the related water injection intensity adjustment scheme was developed.This provides a theoretical basis for guiding the development of chaoyanggou oilfield.