Study On The Distribution Of Remaining Oil And The Design Of Potential Tapping Scheme In Block X

Due to the complex geological conditions,the different properties of crude oil and the uneven process of water flooding in China’s oil fields,there are still a large number of remaining oil in the middle and late stages of exploration and development in China’s oil fields.The remaining oil reserves left underground have great potential for increasing the recoverable reserves of oil fields and improving oil recovery.In this study,after years of development,the X block has different mining conditions,the distribution characteristics of remaining oil are not clear,and the reservoir is low porosity and low permeability reservoir,which is difficult to develop.However,after analysis,there is still a large amount of remaining oil that has not been produced.We need to study the study area to further exploit the remaining oil and improve the recovery of the reservoir block.Based on the research and analysis of the fine geological data and development dynamic data of the study area,this paper studies the remaining oil saturation and the distribution of remaining oil in the study area by numerical simulation method,and uses the reservoir dynamic analysis method to analyze the oil-water distribution characteristics and single well dynamic data.At the same time,the recovery rate is predicted by using the characteristic curves of type A,type B,type C and type D water flooding and the empirical formula method.On the basis of the above research results,the development and adjustment of the study area were studied.Finally,the potential tapping scheme of the study area was put forward,and the scheme was predicted and optimized by numerical simulation method.Through the analysis and research of geological data and development dynamic data,the fine geological model is established by using Petrel modeling software,and then the numerical simulation model of the study area is established by using Eclipse mathematical model software on the basis of the geological model.The geological reserve fitting and history matching are carried out,and the distribution type and distribution law of remaining oil are obtained.At the same time,the development dynamic data were analyzed in detail,and the oil-water distribution characteristics and control factors were obtained.The single well analysis of 249 oil and water wells in the study area was carried out,and the production dynamics and recommended measures of oil and water wells in the study area were summarized.The recovery rate was also predicted.When the water content reached 98%,the average recovery rate was 21.68%.The current recovery degree in the study area was 6.02%,and the potential for tapping was large.On the basis of the above research results,the development and adjustment of the study area was carried out.A total of 8 new drillings,14 perforations,11 plugging holes,5 oil wells and 10 fracturing wells were carried out.Finally,the comprehensive potential tapping scheme of the study area is put forward,and the development effect of five potential tapping schemes is predicted.Among them,the development effect of scheme 5 is the best,the water content is 78.5%at the end of the prediction,the cumulative oil production in the 20-year stage is 162.07×10~4t,and the final recovery degree is 17.89%.Compared with the first scheme,the recovery degree is increased by 8.36%.