Abstract:North transition belt of SaBei development area mainly develops the oil layer of SⅠ and SⅡ,horizontal well B5-8-A53 in this research area extracts the layer of SⅡ2 3,and under the layer of SⅡ2 3 is oil-water layer or water layer. At the present stage, water content of the horizontal well B5-8-A53 has risen severely, there are less injection wells around the horizontal well, and the improvement degree of injection-production relation is low, so we need to concern the problem of regulating injection well around B5-8-A53 and transforming injection for oil well. In this article, through a variety of technical synthetic study, we deepen our understanding of the reservior, perfect the method of the fine geologic modeling, establishe the block fine geologic model, descript heterogeneity of inner layer; summaring coarsening method of the geological model, and we need to match water content and geological reserve by reserching numerical simulation, and on the basis of the distribution of remaining oil, we sort out the well location combined with the established geological model and drilling plan is forecasted and optimized, and find out the best effect of single well optimal scheme of the horizontal well B5-8-A53. This can provide technical guarantee for the horizontal well B5-8-A53 in extra high aquifer stage.