由于对SAGD快速预热技术缩短预热时间的内在机理缺乏深入认识，且现有数学模型无法准确描述这一过程，致使该技术的使用效果被严重制约。针对这一问题，本项目拟以SAGD快速预热过程研究对象，综合运用传热学、热物理学、渗流力学等多学科知识，采用理论分析和物模实验手段开展研究工作。首先，通过一维物理模拟研究储层岩石扩容后储层吸汽量变化规律及相应的传热特征；然后，利用人造岩心研究储层扩容后储层热物性变化情况，讨论孔隙度、油水饱和度、温度三因素共同作用下的储层热物性变化规律；最后，在实验结果基础上揭示预热时间缩短的内在机理，建立考虑储层扩容影响的井筒-地层传热传质模型。本项目的研究成果对于高效运用SAGD快速预热技术具有重要的理论意义，对于通过SAGD技术开发稠油油藏具有重要的指导意义。

Due to the lack of in-depth understanding of the internal mechanism of SAGD rapid preheating technology to shorten the preheating time, and existing mathematical models cannot accurately describe this process, the application effect of this technique is severely restricted. In view of this problem, SAGD rapid preheating process will be taken as the research object in this study, and with comprehensive use of multidisciplinary theories of heat transfer, thermal physics, mechanics of fluid transport in porous media, the research work will be carried out by means of theoretical analysis and physical simulation experiments. Firstly, A study on the variation of the steam absorption and the corresponding heat transfer characteristics after the dilation of reservoir rock by one dimensional physical simulation. Then, artificial core will be used to study the change of reservoir thermophysical properties after reservoir dilation, and the change rule of reservoir thermophysical properties under the joint action of porosity, oil-water saturation and temperature will be discussed. The internal mechanism of SAGD rapid preheating technology to shorten the preheating time will be revealed on the basis of experiments, and the wellbore-formation heat and mass transfer model considering the effect of reservoir dilation will be established at last. The research results of this project have important theoretical significance for the efficient use of fast SAGD preheating technology, and also has important guiding significance on the development of heavy oil reservoir with SAGD technology.