室内实验得到的 CO₂混相驱油效率往往可达 90% 以上，但现场却难以达到室内实验的驱油效果。 限制采收率提高的主要原因是 CO₂的黏性指进、重力超覆和油层的非均质性等因素对注入 CO₂波及效率 的影响。 针对注 CO₂驱开发后期油藏气窜现象逐渐加重、开发矛盾不断加剧等问题，从开发层系、注采结 构、注入方式以及注入剖面 4 个方面开展了改善 CO₂驱开发效果的研究，并提出了细分层系、高部位注气、 水气交替注入、聚合物调剖及 CO ₂+ 泡沫驱防气窜等技术对策。 现场实施结果显示，油藏整体气油比从 2733.1 m³/m³下降到 63.84 m³/m³，日产油从注气前的 30.72 t 上升到注气后的 81.68 t。 该项防气窜综合治 理技术及经验可为类似油藏注气驱开发方案设计和后期防气窜提供借鉴。

It is difficult for the field to achieve the CO₂ miscible flooding efficiency of indoor experiments which could reach more than 90%. Recovery factor is limited mainly by several aspects, namely, CO₂ viscous fingering, gravity overlap and reservoir heterogeneity, which exert negative influence on CO₂ sweep efficiency. On the other hand, gas channeling aggravates gradually and development conflicts intensify continuously at the later stage of production. This paper analyzed development effect of CO₂ flooding, regarding layer series of development, injection-production structure, way of injection and injection profile, moreover, proposed technologies of strata subdivision, injection in the top, water alternating gas（WAG）, polymer profile control and CO₂+foam flooding. Good response has been observed after the onsite implementation. Reservoir overall gas-oil ratio decreased from 2 733.1 m³/m³ to 63.84  m³/m³, and daily oil production increased from 30.72 t（before gas injection） to 81.68 t（after gas injection）. Generally, this anti-gas channeling comprehensive technology is of great significance for similar reservoir scenario design and gas channeling prevention.