【摘要】 稠油油藏原油黏度高，常规蒸汽驱因注入蒸汽的窜流、超覆和热损耗快等因素开发效果较差。为了提升该类油藏开发效益，对蒸汽驱和烟道气辅助蒸汽驱过程中的油藏开发进行三维物模实验研究，并基于分形理论对各阶段油藏储层内蒸汽干度和导热系数分布进行表征。研究结果表明，伴注烟气可基于受热膨胀增能以及热损失削减等效应缓解汽窜和超覆，优化蒸汽波及效率及其加热降黏原油的效果，使采收率在蒸汽驱44.92%的基础上提升至61.47%。烟气的伴注降低其所在储层区域的导热系数，削减储层局部热能损失，使蒸汽流动沿程的干度和流动性提高，促进蒸汽的波及与原油的受热降黏，为采收率的提升创造条件。该研究表明烟道气是优化稠油油藏蒸汽驱效果的优秀媒介，可为丰富烟道气辅助蒸汽驱优化稠油油藏开发效益机理方面的理论提供参考。更多还原

【Abstract】 The crude oil viscosity in heavy oil reservoirs is high. The development effect of conventional steam flooding is poor due to factors such as the steam channeling, overlay, and fast heat loss. In order to enhance the development benefits of this type of oil reservoir, the development status of oil reservoirs during steam flooding and flue gas-assisted steam flooding were investigated by three-dimensional physical modeling experiments. The distribution of steam quality and thermal conductivity in reservoirs at different stages were characterized based on fractal theory. The results show that the injection of flue gas can alleviate steam channeling and overlay based on the effects of thermal expansion and heat loss reduction, optimizing the steam sweep efficiency and the effect on reducing the viscosity of oil of steam. These situations increase the oil recovery rate from 44.92% of steam flooding to 61.47%. The flue gas reduces the thermal conductivity of the reservoir area where it exists, reduces the thermal energy loss of steam in this area, improves the quality value and fluidity of steam flow along the way, and promotes the spread of steam and the viscosity reduction of oil, creating conditions for the secondary improvement of recovery rate. This study indicates that flue gas is an excellent medium for optimizing the effect of steam flooding for heavy oil reservoirs, providing a corresponding reference for enriching the theory about the mechanism of flue gas-assisted steam flooding to optimize the heavy oil reservoir development efficiency.更多还原