方法　对空心抽油杆注热水、热水洗井工艺进行数模计算 ,确定井筒流体沿程温度分布。目的　研究稠油油井中存在的井筒温度出现拐点现象。结果　空心抽油杆注热水、常规油管热水洗井工艺中存在井筒温度出现拐点现象 ,而绝热油管热水洗井工艺中不存在拐点现象。结论　稠油油井中的井筒温度出现拐点现象是流体、地层、管系共同作用的结果 ,这种现象存在但不绝对 ,应根据现场实际计算确定 Methods Numerical simulation of hollow sucker rod injection hot water and hot water well washing process was carried out to determine the temperature distribution along the wellbore fluid. Objective To study the inflection point of wellbore temperature existing in heavy oil wells. Results Hollow sucker rod was used to inject hot water. There was an inflection point in wellbore temperature during the conventional tubing hot water flushing process. However, there was no inflection point in the process of hot water flushing of insulated tubing. Conclusions The inflection point of wellbore temperature in heavy oil wells is the result of joint action of fluids, strata and pipelines. This phenomenon exists but is not absolute and should be determined according to the actual field calculation