大庆长垣外围特低渗透的扶余油层有3.7×10⁸t储量在常规注水开发条件下不能经济有效动用。以探索适合扶余油层地质特点的经济有效开采方式和提高单井产量、采收率为目标，采用室内实验和数值模拟的综合方法进行了CO₂驱油问题的研究。通过实验测定了扶余油层CO₂驱替的相关参数，对几种驱替方式进行了比较；根据相关参数，利用数值模拟方法，对扶余油层CO₂驱油矿场试验方案进行了优化，制定了矿场实验的注入方案。室内实验结果和矿场试验生产动态综合分析表明，CO₂非混相驱油适应于大庆长垣外围特低渗透扶余油层，但由于试验区油藏的非均质性导致气窜严重。因此，抑制气窜，提高波及效率是扶余油层改善CO₂驱替效果的关键。

The Oil reserves of about 3.7×10⁸ t cannot be economically developed by the conventional waterflooding in the Daqing placanticline. To seek for a feasible development method for extra\|low permeability oil layers, this article studies the CO₂ drive using laboratory experiments and numerical simulation. Based on the experiment results of porous flow law and phase behavior, the CO₂ injection pattern is established. Immiscible displacement conditions for CO₂ drive are presented. Pilot tests were carried out in five wells in the Fang 48 block of the Daqing oil field. The CO₂ drive got success in enhancing oil recovery in the extra-low permeability oil field.