Evaluation And Countermeasure Research On Development Effect Of Typical Blocks In Chaoyanggou Oilfield

Chaoyanggou Oilfield has entered a stage of high water cut and production decline after many years of water injection development.In order to improve the development effect of low permeability oilfields and enhance the recovery rate of low permeability oilfields,the typical blocks of Chaoyanggou oilfield are comprehensively evaluated,and sufficient preparations are made for the follow-up oilfield development.In this paper,the typical blocks of Chaoyanggou oilfield are predicted by various recovery calculation methods.Combining with the characteristics of low permeability reservoirs and the current development situation,the recovery prediction method suitable for the typical blocks of Chaoyanggou oilfield is optimized.The recovery rate of low permeability oilfields is calculated by combining the water drive law curve with the displacement series curve,and the current oil price and the cost of oil production input are comprehensively considered.The ultimate moisture content is determined to be 80%by using and profit.Based on the grey system theory,the classification evaluation index and criteria of Chaoyanggou low permeability reservoir are established,and the classification calculation and evaluation are carried out.The results show that the evaluation of C05 block in one block is medium,C50 block is good;that of C601 block in the second block is medium,that of C631 block is good,that of CQ3 block is good.Using numerical simulation method,the typical blocks are described in detail,and the remaining oil distribution in each layer is analyzed.Combining with the evaluation results of reservoir engineering method and numerical simulation method,and aiming at the problems of dominant seepage passage and unbalanced utilization of plane and interlayer in some blocks,this paper puts forward some control countermeasures.The numerical simulation method is used to predict the recovery of typical blocks after three years of measures,and the recovery rate of implemented measures in typical blocks after three years is higher than that of non-implemented measures.The results show that the degree of water drive control increases from 60.1%to 65.3%,the water drive recovery increases from 30.27%to 32.53%,the formation pressure of the second block rises,the water drive recovery increases from 22.84%to 25.02%,and the water drive recovery of the third block rises from 26.53%to 29.23%,and increases by 2.70%.One percentage point to achieve stable pressure production in the oilfield.