Physical modeling, numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state, thermal oxidation front characteristics and production dynamic characteristics of high pressure air injection thermal oxidation miscible flooding technology. The lighter the composition and the lower the viscosity of the crude oil, the lower the fuel consumption and the combustion temperature are. The thermal oxidation front of light oil and volatile oil can advance stably, and a medium-temperature thermal oxidation stable displacement state can be formed in the light oil reservoir under high pressure conditions. With strong thermal gasification and distillation, light oil and volatile oil are likely to form a single phase zone of gasification and distillation with thermal flue gas at the high-temperature and high-pressure heat front, finally, an air-injection thermal miscible front. In light oil reservoirs, the development process of high-pressure air-injection thermal miscible flooding can be divided into three stages: boosting pressure stage, low gas-oil ratio and high-efficiency stable production stage and high gas-oil ratio production stage. Approximately 70% of crude oil is produced during the boosting pressure stage and low gas-oil ratio high-efficiency and stable production stage.

为了进一步提高稠油油藏蒸汽驱后期采收率和开发效益,以新疆油田J6区块为研究对象,通过室内三维物理模拟实验,分别对全射孔条件下蒸汽驱、CO2辅助蒸汽驱、CO2泡沫辅助蒸汽驱和射开下部油层下半部分条件下蒸汽驱、CO2辅助蒸汽驱进行了实验研究,提出了蒸汽驱后期CO2辅助蒸汽驱开发技术.室内实验表明:蒸汽驱后期调整射孔后的CO2辅助蒸汽驱形成了注汽井中下部蒸汽腔侧向扩展、生产井顶层蒸汽腔超覆重力泄油的开发模式,高温水、油、CO2能够形成稳定的低黏拟单相乳化流体,且CO2在顶部的蒸汽腔起到隔热作用,在蒸汽腔内部降低了蒸汽分压,有效提高了注入蒸汽热效率.根据新疆油田J6区块CO2辅助蒸汽驱设计和应用效果,调整射孔后,与蒸汽驱相比,CO2辅助蒸汽驱将油汽比从0.12提高到0.16,增长34.0％,阶段采出程度从16.1％提高到21.5％,最终采收率可以达到66.5％.