高含水油藏剩余油富集区筛选评价方法及其应用OA

High water-cut reservoirs have scattered remaining oil,resulting in difficulties in analyzing remaining oil potential areas suitable for complex structural wells development and limit tapping effect.Based on the study of dis-tribution characteristics of remaining oil in Placanticline high water-cut reservoirs,a method for accurately screen-ing and evaluating remaining oil enrichment areas is proposed,eastablishing an evaluation system for enrichment areas indicators including 5 factors.The preliminary screened enrichment areas for remaining oil are evaluated by using comprehensive fuzzy evaluation method,and potential areas are selected based on the evaluation results.The results show that the proposed concept of the remaining oil continuity coefficient enables the three-dimensional char-acterization of remaining oil enrichment areas with various areal scales,thicknesses and water-flooded degrees in high water-cut reservoirs,allowing rapid and accurate screening of remaining oil enrichment areas suitable for com-plex structural wells development.Taking block X in Daqing Oilfield as an example,this method is used to select potential areas,and 8 sidetracked horizontal wells are implemented for targeted potential tapping in the filed,achieving excellent results.This demonstrates that the technique improves the reliability of remaining oil enrich-ment areas analysis and is suitable for accucrate targeted potential tapping in high water-cut reservoirs.