大庆油田三元复合驱合理井网井距研究

通过大庆油田不同井距的中区西部、杏五区两个三元复合驱先导性矿场试验和北一区断西、杏二区两个扩大的三元复合驱矿场试验的动态反映特征,在大庆油田实际油层地质条件下,模拟了计算的直列式、斜列式、四点法、五点法、七点法、九点法和反九点法7种井网布井方式对三元复合驱油效果影响的结果,研究了大庆油田三元复合驱的最佳布井方式和井距。结果表明,五点法面积井网的驱油效果最高,七点法面积井网的最差;在大庆油田三元复合驱注入速度为0.1~0.2 PV(孔隙体积倍数)条件下,对于主力油层,以注入压力不超过油层破裂压力为限,注采井距不宜大于300 m。大庆油田经过一次加密调整和二次加密后,大面积构成了注采井距为200~250 m的五点法面积井网,为大庆油田大规模开展三元复合驱提供了良好的应用条件。

OPTIMIZATION OF WELL PATTERN AND SPACE FOR DAQING ASP FLOODING

In this paper, the influences of well pattern and space on ASP flooding in Daqing oilfield were investigated by using nu-merical simulator GCOM. Well patterns, including 4-spot, 5-spot, 7-spot, 9-spot, inverted 9-spot, straight row and inclination row in the simulation, and well spaces ranging from200 to 300m were studied in this simulation. The numerical simulation results indicated that the 5-spot is the most favor-able well pattern for ASP flooding in Daqing oilfield, while the 7-spot is the worst well pattern. The well space between in-jector and producer should be smaller than that of 300m at suchsimulation conditions as injection volume ranging from 0.1 to 0.3 PV and injection pressure less than 13.5 MPa. As a result, in-fill drilling will give good future for industrial application of ASP flooding in Daqing oilfield.