Numerical Simulation Study On The Adjustment Of The Development Scheme Of E Block

Due to the long development time in the water flooding stage,large well spacing,poor well pattern sweep effect and high water cut,the well pattern of SⅡ Group in Block E needs to be adjusted in order to further exploit the remaining oil.The oil layer of SⅡ Group is poorly developed on the whole,with large difference between layers,and good and bad layers are distributed vertically and interactively.If the bad layer is exploited simultaneously,it is difficult to effectively use the bad layer,so it is determined to develop the bad layer first.The development sequence of the redeveloped good layer;The PI3 formation is in the follow-up water flooding stage of ASP flooding,and the production is low,so it is considered to return to the SⅡ formation oil reservoir.In this paper,the well pattern adjustment and optimization of thin differential formation of SⅡ formation is studied by combining the ASP flooding upstream well pattern and the current water flooding well pattern.At the same time,considering that there are still some remaining oil in PI3 formation,the production replacement scheme of PI3 formation is studied.In this paper,reservoir numerical simulation technology is used to establish a fine geological model,and on the basis of water flooding history fitting,the remaining oil of thin differential formation of SⅡ Group is analyzed.Currently,the remaining oil is mainly distributed in the fault edge and the area where the well pattern cannot be controlled.Combined with the ASP flooding upreturn pattern and the current water flooding pattern,a total of four well pattern adjustment schemes are designed.The well pattern adjustment and optimization study of thin differential formation of SⅡ group was carried out.According to the comparison results of the development effects of the schemes,scheme 4(namely,the scheme of using ASP flooding upreturn pattern and 14 water flooding)was recommended,with the stage recovery degree of 16.77% and the predicted total recovery rate of 53.25%.On the basis of historical fitting of ASP flooding stage,the remaining oil of PI3 formation is analyzed.Currently,the remaining oil is mainly distributed in the shunt line of ASP flooding well pattern.Five sets of production replacement schemes are designed by using water flooding Wells and inefficient and ineffective Wells in the well site.Plan 8(15 water drive production Wells and 10 water drive injection Wells)is recommended,with a stage recovery of 4.08% and a final recovery of 73.80%.According to the study on the adjustment and optimization of thin and differential well pattern in SⅡ Group,the remaining oil saturation in the uncontrolled well pattern area decreases obviously under the displacement of new well pattern,and the remaining oil distributed at the fault edge is used,and the remaining oil can be explored effectively.As for the production replacement scheme of PI3 formation,under the new well pattern flooding,the remaining oil at the shunt line of the original ASP flooding pattern can be effectively used with good potential exploitation effect.The numerical simulation results show that the optimized scheme can improve the existing problems in the current block,effectively exploit the remaining oil,achieve the best development effect,and provide technical support for the block layer adjustment.