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研究了注蒸汽开采稠油工程设计所涉及的井筒传热问题中地层热阻的计算方法，指出了地层热阻计算方法的局限性，并提出了基于Ｄｕｈａｍｅｌ卷积定理的新的计算方法。通过应用两种方法对同一问题的计算对比，发现用Ｒａｍｅｙ方法计算出来的地层热阻较小，相应地计算出来的散热强度较大，井筒结构与地层交界面的温度较低。在注蒸汽的初期，应用改进的方法计算出来的交界面温度要比Ｒａｍｅｙ方法大得多，用改进的方法得到的计算结果可以为注蒸汽过程中井筒结构的热应力分析提供可靠的数据
The calculation method of formation thermal resistance in wellbore heat transfer problems involved in steam injection heavy oil engineering design is studied. The limitation of calculation method of formation thermal resistance is pointed out and a new calculation method based on Duhamel convolution theorem is proposed. Comparing the two methods to calculate the same problem, it is found that the thermal resistance of the formation calculated by Ramey method is relatively small, and the calculated heat dissipation intensity is relatively large, and the temperature at the interface between the wellbore structure and the formation is relatively low. In the early stage of steam injection, the interface temperature calculated by the improved method is much larger than that of the Ramey method. The calculation results obtained by the improved method can provide reliable data for the thermal stress analysis of the wellbore structure during steam injection