高凝油油藏剩余油分布规律研究

Residual Oil Distribution in High Pour-Point Reservoir

针对常规地质统计技术及网格粗化近似技术在油藏剩余油饱和度求取过程中存在较大误差的问题,优选性能稳、算速快以及无网格定向效应的流线数值模拟方法,利用水驱开发油藏三维流线模型研究工区流线分布与剩余油配置关系。由研究结果可知,流线推进特征时间同层系调整时间吻合,小层剩余油分布与水线推进规律匹配,井组剩余油分布同沉积、断层以及温度等多因素协同作用相关。为此,建议进一步完善工区注采井网系统,并考虑在局部井组采用针对性的热水、蒸汽驱替,克服原油温敏效应,以提高采收率。通过研究,明确出油及来水方向,找到当前注采流线未能波及的剩余油富集潜力区,为下一步调整井网挖掘剩余油指明了方向。

Conventional geology statistics and grid upscaling technologies usually result in relatively a great error in the remaining oil saturation simulation. Streamline numerical simulation with stable performance,high efficiency and no grid orientation effect is used to take advantage of waterflooding3 D streamline simulation to gain the streamline and remaining oil distributions. Research demonstrates that the characteristic time of streamline advancing is consistent with the time of strata series adjustment,remaining oil distribution of sublayers agrees with water streamline advancing,and wellgroup remaining oil distribution is dependent on deposition,fault,temperature,etc. It is recommended to further improve the injection-production well network and implement specific hot-water flooding,stream flooding in local wellgroups to overcome oil thermo-sensitivity and enhance oil recovery. The remaining oil distribution and water inflow directions are identified,which could provide guidance for further well network adjustment and enhancing oil recovery.