稠油油藏注CO_2吞吐适应性研究

以辽河油田的高升、冷家堡油藏为例 ,运用数值模拟和油藏工程方法对稠油油藏注CO2 吞吐进行了适应性研究 .研究表明 :原油黏度是影响CO2 吞吐效果最敏感的参数 ,随原油黏度增大 ,换油率增大 ,可以选择原油黏度较高的油藏进行CO2 吞吐 ;对于有一定自然产能的油藏来说 ,含油饱和度并非越高越好 ,而是有一定的适应范围 ;对于普通稠油 ,随原油黏度改变 ,合适的含油饱和度、孔隙度范围随之改变 .作出了普通稠油的黏度—含油饱和度图版、黏度—孔隙度图版 ,同时结合油田实际作出了两种不同标准的经济适应性图版 .所得的结果对辽河稠油油藏选择合适的CO2 吞吐井有一定的指导意义

Research on the adaptability of cyclic CO2 injection for heavy oil reservoir

Gaosheng and Lengjiabu heavy oil reservoirs being taken as examples, the adaptability of CO_2 huff-n-puff for heavy oil reservoirs is studied in order to get convenient and practical criterion of cyclic CO_2 injection for heavy oil reservoirs.The results show that the viscosity of crude oil is the most sensitive parameter to the result of CO_2 huff-n-puff, the higher the viscosity, the greater the utilization efficiency of CO_2. For the heavy oil reservoirs which can produce naturally, there is a suitable range of oil saturation to CO_2 huff-n-puff; for common heavy oil reservoirs, the suitable ranges of oil saturation and porosity vary with the viscosity of crude oil. Viscosity-oil saturation and viscosity-porosity charts are drawn, and two economical adaptability charts are also presented with real market conditions being considered. The results of this paper have guidance to selecting suitable heavy oil reservoirs to CO_2 huff-n-puff in Liaohe Oilfield.