中文摘要：

辽河油田杜家台油层为低渗透储层,非均质性严重,开发时间长,含水率高,注水困难,为了改善杜家台油层开发效果,拟进行氮气驱开发。首先通过对杜家台油层原油进行了相态模拟研究,计算出了杜家台油层氮气驱最小混相压力（MMP）,确定了杜家台油层氮气驱为非混相驱替。通过杜家台油层典型井组氮气驱开发的方案设计与指标预测,确定了氮气驱气水交替注入开发效果最佳;并优化出气水比、气水交替周期、注气速度、转注时机等参数。所提出的方案能明显改善该油藏开发效果,为杜家台油层及类似水驱油藏的开发调整提供依据。

英文摘要：

The potential for application of nitrogen injection to Dujiatai which is a water-flooding reservoir developing for decades was evaluated. ECLIPSE PVTi module of simulation was employed to determine N2-oil MMP（ Minimum miscibility pressure） which is as a criterion for screening. Then,through nitrogen flooding development scenario design and index prediction of a typical well group,we get the optimal water alternating gas（ WAG） scenario. It can obviously increase the reservoir recovery for the next decade,which can be a useful development method for similar water-flooding reservoirs.