注CO_2提高普通稠油油藏驱油效率物理模拟试验研究

Study on the physical simulation test of injecting CO_2 to improve the flooding efficiency of general heavy oil

在开展注CO2提高普通稠油油藏驱油效率的可行性研究过程中,采用物理模拟试验的方法,通过对比模拟岩芯的驱油效率,评价了CO2的不同注入方式,改善不同储层特征的普通稠油油藏驱油效率的影响幅度。试验结果表明:注CO2能够提高普通稠油油藏的驱油效率;不同的CO2注入方式,对改善油藏的驱油效率影响幅度不同;采用CO2与水交替注入的驱替方式,驱油效果最好,同比水驱,能够提高普通稠油油藏的驱油效率10%～15%左右。该项研究可以为现场生产工艺设计提供技术参数。

The physical simulation test is used in the process of feasibility research on injection CO2 to improve the flooding efficiency of general heavy oil. By comparing the flooding efficiency of simulation core, the authors evaluate the impacting rates of the different CO2 injection methods on the flooding ef- ficiency of general heavy oil with different reservoir characteristics. The testing results show that injecting CO2 can enhance the flooding efficiency of general heavy oil and different injection methods have different impacting rates on improving the flooding efficiency. Besides, the best flooding effect can be obtained by alternately injecting CO2 and water with the flooding efficiency up 10-15% compared to injecting water only. This research supplies technical parameters for the on-site production process design.