交替注CO_2/N_2驱油机理数值模拟研究

Numerical simulation of displacement mechanisms in CO_2 alternate N_2 slug injection

针对江苏油田已投入开发断块油藏,开展交替注CO2/N2段塞驱提高采收率可行性研究。在地层复合流体相态特征实验数据拟合计算基础上,采用数值模拟技术开展均质剖面、正韵律剖面、反韵律剖面、含夹层剖面、层间非均质剖面模型注N2、注CO2、交替注注CO2/N2气驱开发效果敏感性分析,阐述交替注CO2/N2段塞驱替机理。

Aiming at fault block reservoirs of Jiangsu Oilfield,which have been put into development, a feasibility study was carried out for improving oil recovery by CO2 alternate N2 slug displacement. Based on simulation results fitting with experimental data of phase behavior of the formation fluid, the sensitivity of development efficiency by N2 injection, CO2 injection,and CO2 alternate N2 slug injection was analyzed by mathematical models,which included homogeneous,interlayer heterogeneous profile, positive rhythm, inverted rhythm profile, and comprised interbedded stratum profile. Therefore, it was expounded the displacement mechanisms of CO2 alternate N2 slug injection.