彰武油田彰武2井区注水开发动态

Dynamic Analysis of Waterflooding Development in Zhangwu 2 Well Block of Zhangwu Oilfield

彰武油田为常温常压、中孔、低渗、高凝普通稠油Ⅰ类油藏。该区块2011年投入开发,目前井区存在平面非均质强,油井动用有差异;受人工裂缝影响,优势通道明显;层间非均质强,水井层间吸水差异大等问题,针对这些问题,优选中部核心ZW2-2-1井组,通过深化油藏认识,认清剩余油分布潜力,通过水井调剖封堵优势通道;水井分注加强主力层注水;对老井重复压裂引效;注热水减小储层冷伤害等手段使得井组产量递减趋势明显得到缓解。与调整前相比,井组日油水平提高3.6 t/d,月递减指数由0.036下降为0.029。

Zhang wu oilfield for atmospheric pressure,medium porosity and low permeability,high condensation ordinaryⅠkind of heavy oil reservoir.This block was put into development in 2011.At present,there are many problems in the well block,such as strong plane heterogeneity,different production of oil wells,obvious dominant channels affected by artificial fractures,strong interlayer heterogeneity,and great difference in water absorption between well interlayer.In view of these problems,the central core ZW2-2-1 well group was selected to recognize the remaining oil distribution potential by deepening the reservoir understanding,and the dominant channel was blocked by well profile control.Through separating injection of wells to strengthen water injection of main strata,refracturing effect on old wells,hot water injection to reduce cold damage of reservoir,the production decline trend of well group is obviously alleviated.Compared with before adjustment,the daily oil level of well group increased by 3.6 t/d,and the monthly decline index decreased from 0.036 to 0.029.