胜利油田聚合物驱后二元复合驱油体系优化

Optimization of Binary Combination Oil Displacement System after Polymer Flooding in Shengli Oilfield

针对胜利油田聚合物驱后油层中仍有大量原油未被采出的情况,选取应用聚合物驱较为典型的孤岛中一区Ng3油藏开展了二元复合驱油体系优化,并进行了系统评价,结果表明,优化的二元复合驱油体系与原油可达到超低界面张力状态,其吸附量小,热稳定性及驱油效果好。物理模拟试验结果表明,聚合物驱后二元复合驱可提高采收率10.6%,优于单一聚合物驱,经济效益和可操作性优于三元复合驱,且具有较好的调驱能力。

Since a huge amount of crude oil has not been produced in oil layers after polymer flooding in Shengli Oilfield, binary combination oil displacement system is optimized in Ng3 oil reservoirs of Zhongyi area in Gudao Oilfield with the typical polymer flooding and is evaluated systematically. The research re- sults indicate that the optimized binary combination oil displacement system can be at the state of super-low interfacial tension with the crude oil, achieving small adsorptive power, good thermal stability and oil displacement results. Physical simulation experiment results show that the binary combination oil displacement can improve 10.6% of oil recovery efficiency after the polymer flooding, which is better than single polymer flooding and tertiary combination flooding on economic benefits and availability and has better capabilhy of profile control and oil displacement.