Study On Subdivision Adjustment Of Unit 1-2 In Middle ES3 Of Xia 52 Block In Linnan Oilfield

After years of water flooding development,Linnan oil field has already entered the stage of super high water cut.At present time,the prominent problem is that,the interlayer contradictions are serious due to the reservoir heterogeneity in the commingled production condition,the recovery of the high permeable layer is very high and the layer has been flooded badly,the low permeable layer is not under the control of any well pattern and the recovery is too low.On the basis of the recognition of reservoir characteristics and the evaluation of development effect,it is analyzed that the main problem is that the division of the layer system is too rough and the imperfection of the well pattern.On the basis of fully understanding of the reservoir geological characteristics,the reserve using and bed set well pattern situation were studied,the effect of water flooding and the using situation of energy are evaluated and the recovery was predicted by using the production performance and monitoring data.Moreover,the fine numerical simulation study for Xia 52 block is carried out by using numerical simulation software,the characteristics of remaining oil distribution of unit 1-2 in Middle ES3 of Xia 52 Block were gained.The principle of adjustment is confirmed by the studying of division and combination of the layer system,combined with the development situation of different small layers and the characteristics of remaining oil distribution.According to the reservoir properties and development situation,the reservoir is developed by dividing unit 1-2 in Middle ES3 of Xia 52 Block into three series,the layers with high permeability of 1 and 2 category are separately combined into a set of layer system,and the low use reserve non-active layers were combined into a set of layer system,and the well network is established for development.The feasibility of subdivision of layer system was proved by reservoir engineering method,and the subdivision adjustment scheme of unit 1-2 in Middle ES3 of Xia 52 Block is designed.