Adaptability Evaluation And Development Index Prediction Of Well Patterns Of Fuyu Reservoir In Xing 76 Block

The Fuyu reservoir of the Xing-76 block belongs to the low porosity and ultra-low permeability lithologic reservoir,which is characterized by the small scale of the river channel,the poor connectivity,the quick conversion of the flat sand body,the poor connectivity and the thin thickness of the single sand.It is not easy in mining process.Aiming at the characteristics of low permeability reservoirs,the three-dimensional visualization geological modeling software and reservoir numerical simulation software are used to research methods which are suitable for low porosity and low permeability.It can play a key role in improving the development effect and guiding the development and adjustment.According to the dynamic and static characteristics of Fuyu oil layer in the study area,the petrel geological modeling software is used to the reservoir area.In the light of the reservoir porosity,permeability and saturation data,heterogeneity,phase distribution,etc.,.The three-dimensional geological model is established by using intra-phase interpolation technique,which divides the fluid properties and relative permeability reasonably,including fault model,structure model,phase model,attribute model and so on.Due to the lack of logging data in the Fuyu reservoir,the numerical simulation of the apical data of the apricot-76 block with similar reference properties was carried out.According to the numerical simulation to complete the fitting,after its completion,summarize the longitudinal,horizontal residual oil distribution characteristics,quantify the remaining oil in each layer and the deposited microfacies.Untill September in 2016,the total oil of Fuyu layer was 1.45×104t and the comprehensive recovery degree was 1.43%.According to the results of vertical and horizontal quantification,FI and F Ⅱ were better than other oil groups,and the degree of microfacies was 1.75%.After 10 years of mining,the distribution of residual oil in Fuyu oil layer showed an imbalance,and the amount of oil accumulated in the FI group was 8.57×104t and the recovery rate reached 14.4% through the comparision of remaining oil in each layer.FII group of oil production was5.32×104t,the degree of recovery reached 12.8%.The adaptability analysis of the well pattern was carried out from the multi-angle,such as the characteristics of water use,the law of water change,the law of water production,the waterflooding characteristic curve,the reasonable injection and production well ratio,the well control degree and the development index.The adaptability of waterflooding development inFuyu reservoir is better.And for the well network to carry out the super filling time,formation pressure to maintain the level of reasonable injection and production speed and other development policy boundaries to determine the advanced water injection policy and a reasonable injection rate.Based on the method of numerical simulation and forecasting,the development index forecast of waterflooding development for 10 years and limit moisture content is carried out.The cumulative oil production is 13.89×104t,the comprehensive water content is 92.52% and the recovery rate is 13.73%.