The settlement of thermal insulation materials for overhead heavy oil injection pipelines will have a significant impact on the assessment of pipeline heat loss and calculation of economic benefits. A heat transfer model of the heat⁃insulating material settlement steam injection pipeline was established, and the effects of environmental wind speed, pipeline diameter and soil radiation on pipeline heat loss were analyzed.The results show that increasing the outdoor environment wind speed leads to increased heat loss of the eccentric insulation pipe, and when the environmental wind speed increases by 120%, the heat loss outside the pipeline insulation increases by 5.9%. The larger the pipe diameter, the smaller the heat loss of the air interlayer. The average heat flux of the outer wall of the insulated eccentric insulation pipeline is reduced by 1 036 W/m2 compared with the soil radiation.