CO_2混相驱影响因素分析及主控因素筛选

CO_2混相驱是一种可以将导致全球气候变暖的CO_2气体用于大幅度提高原油采收率的环保采油方式。基于多孔介质中CO_2混相驱渗流规律的影响因素很多,针对我国油藏非均质性严重、混相困难等特点,分析影响我国CO_2混相驱的因素,通过数值模拟对孔隙结构、注入速度、储层非均质性、地层压力和初始含油饱和度五个影响因素进行分析,筛选出影响CO_2混相驱混相效果的主控因素,在认识影响CO_2混相效果主控因素的基础上,为油田调整开发方案提供参考。

Analysis on Factors of Affecting CO2 Miscible Flooding and Selection of Main Controlling Factors

The CO2 miscible flooding is the technique to increase oil recovery obviously with CO2. Factors of affecting CO2 miscible drive rules in the porous medium are various. In this paper, based on the reservoir characteristics such as serious heterogeneity, mixing difficulty and so on, the factors influencing the CO2 miscible flooding were analyzed. The five factors including pore geometry, injection rate, reservoir heterogeneity, reservoir pressure and initial oil saturation were analyzed through numerical simulation, and then the main controlling factors were selected. On the basis of acquiring the main controlling factors of the CO2 miscible flooding, the oilfield development plan was put forward, so as to achieve the effect of environmental protection and high yield.