Abstract: The exploitation mode of heavy oil is mainly to decrease the viscosity of crude oil and increase its fluidity. The viscosity of crude oil is extremely sensitive to temperature, so the thermal recovery modes are much concerned. In this paper, the experimental well in Block A of Bohai Oilfield was taken as an example. The characteristics of heat transfer in the concentric borehole of the well equipped with jet pump by taking the multi-component thermal fluid as the power fluid were introduced. Then, the heat transfer process of thermal fluid in each part of the borehole was investigated, and the method for calculating the combined heat transfer coefficient was developed. In addition, the borehole temperature field model was established, and the software was programmed according to the corresponding temperature field solution process. Finally, the calculation was carried out with one actual production well equipped with jet pump as the example. It is shown that the error between the actual measurement value and the calculation result is 8.87%. It is proved that the research results can provide the guarantee for the working condition diagnosis and parameter optimization of wells equipped with jet pump in offshore heavy oil fields.