Evaluation Of Water Injection Development Effect In JN Oilfield

At present,most sandstone reservoirs in China are developed by water injection mode,but there are few evaluation results for waterflooding in offshore oilfield.In order to systematically study the water injection development effect of this type of oil reservoir,this paper takes JN oilfield as the research object,and makes a detailed evaluation on 3 main oil layers in JN oilfield(Sha two section I oil group,sand two section II oil group and Qianshan of Archaean).First,based on the production characteristics of JN oil field,the dynamic analysis of water injection development is carried out,and then the application is applied.The reservoir engineering method evaluates several key development effect indexes,such as water consumption,comprehensive water content,water injection wave and volume,reserves,control degree,water absorption capacity of oil layer and so on.Finally,the optimization scheme of injection production parameters is put forward by detailed calculation of injection and production pressure system.The results show that the utilization ratio of water injection in JN oilfield is relatively low,the injection production system is not perfect enough,the water storage rate is about 50%~55%,the production capacity decreases rapidly,and the JN oil area is wide.However,because of the geological conditions,the stratification of the oil field is not so meticulous,the existing Shahe street is divided into two layers,and the Archean boundary has not subdivided the oil group,The intra-layer contradiction is bound to become more and more prominent with the development of the development;JN oilfield is a terrestrial delta deposit.The overall reserves control degree is about 80% through the oil sand body statistics method.Considering the heterogeneity of the reservoir,the actual value is still lower,and the overall control degree is in the middle and upper levels of the delta sedimentary oil fields.There is still room for improvement.The evaluation of water injection development effect and adjustment of corresponding injection production system in JN oilfield has important guiding significance for similar reservoir development.