孤岛油田化学复合驱扩大试验

孤岛油田特高含水期常规井网化学复合驱油扩大试验经历了前置段塞、主段塞、后置保护段塞的注入及后续水驱，目前试验区综合含水率基本接近试验前水平。由于复合驱扩大了波及体积、提高了驱油效率，注入系统和采出系统均发生了相应的变化。水井注入压力升高，吸水剖面得到调整，层间矛盾得到改善；油井产油量大幅度上升，含水率大幅度下降，实际提高采收率已达11．7％。与水驱相比，开发效果得到明显改善，复合驱扩大试验取得了成功。由于试验是在常规井网下进行的，该试验的成功说明胜利油区在常规井网和污水配注条件下实施复合驱油可以取得明显的降水增油效果。图5表2参11

An expanded combination chemical flooding test in Gudao Oilfield

The ASP combination chemical flooding expansion test of ultra high water cut period has succeeded in the conventional well patterns in Gudao Oilfield. The water cut is close to that before the test after pre-slug injection, main slug injection, protective slug injection and the follow-up water flooding. The ASP flooding enlarged the swept volume and improved the displacement efficiency. The iniection pressure rose, the injectivity profile and interlayer contradiction was modulated. The oil production increased and the water cut dropped. The development effect improved evidently compared with water flooding. The enhanced oil recovery is 11. 7%. The success of the expanded test shows that it is possible to enhance oil and reduce water by using ASP flooding in the conventional well patterns with waste water injection.