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辽河油田包14块为典型的裂缝性低渗透油藏,采用压裂方式投产。该区块裂缝发育,储层非均质性强,层间矛盾严重,常规注水开发效果差,无法达到标定采收率。通过三维地震资料与动静态资料紧密结合分析,对裂缝水驱机理进行研究并对调驱可行性进行论证,确定由裂缝驱油向孔隙基质驱油方式转变,进而引进具有封堵和驱替作用的深部调驱技术。结合包14块优势通道发育分布及裂缝开度,通过室内研究,研制出适合低渗透裂缝油藏的配方体系。优选储层及油层发育、剩余油富集、优势注水通道发育、连通性好的西南部构造高部位两个井组开展调驱先导试验。试验结果表明,日产油由10.8t/d上升至23.9t/d,含水由71.4%下降至56.3%,注入水推进速度由10.9m/d下降至6.1m/d,水驱储量动用程度由39.8%提高至52.2%,区块整体递减率下降,大幅改善了平面及层间矛盾。
Liaohe Oilfield package 14 is a typical fractured low permeability reservoir, fracturing mode put into operation. This block has developed fractures, strong reservoir heterogeneity, serious conflicts between layers, and poor performance of conventional water injection and development, thus failing to reach the calibration recovery rate. Through the close combination analysis of 3D seismic data and dynamic and static data, the mechanism of water flooding in fractures is studied and the feasibility of flooding control is demonstrated. It is determined that the displacement from fractured flooding to pore matrix flooding mode is changed, and the effect of plugging and flooding is introduced Deep drive control technology. Combined with the developmental distribution of fissures and the opening of fissures, the formula system suitable for low permeability fractured reservoirs has been developed through laboratory research. Preferential reservoir and reservoir development, the remaining oil enrichment, the dominant waterflooding channel development, good connectivity in the southwestern part of the high structure of the two well groups to carry out the pilot drive test. The results showed that the daily oil production increased from 10.8t / d to 23.9t / d, the water cut decreased from 71.4% to 56.3%, the rate of water injection decreased from 10.9m / d to 6.1m / d, and the utilization of waterflooding reserve increased from 39.8 % To 52.2%, the overall decline in the rate of decline in the block, a substantial improvement in the plane and inter-layer conflicts.