Research On Heat Transfer Model And Temperature Field Characteristics Of Heavy Oil Thermal Recovery

Large viscosity and poor fluidity are major challenges in heavy oil recovery.The viscosity of heavy oil is particularly sensitive to temperature because the viscosity can be reduced by half for every 8 to 9 °C increase in temperature.In heavy oil recovery and transportation operations,increasing crude oil temperature is an important and effective measure to improve the fluidity of heavy oil.Common techniques for heavy oil thermal recovery include electric heating in the wellbore,hot fluid circulation and steam injection.Studying the heat exchange process of wellbore and reservoir in three heating conditions and the temperature distribution in wellbore and reservoir under different operating parameters are of great significance for parameter design and site construction.In this paper,the flow and heat transfer mechanisms of three heavy oil thermal recovery processes are studied.The flow and heat transfer models are established.The numerical calculation method of temperature and pressure field is established.The distribution of temperature field in wellbore and reservoir of three heavy oil thermal recovery technologies is clarified and the calculation simulator was developed.A better guidance for the implementation of heavy oil thermal recovery technology is provided.Based on the heat transfer model and numerical calculation method established in this paper,three wellbore temperature field calculation simulators for heavy oil thermal recovery process are programmed.The validity of the model is verified,and the effects of operating parameters such as electric heating power,hot fluid circulation inlet temperature,hot fluid circulation inlet displacement,steam injection speed and steam injection dryness on the wellbore temperature field are analyzed.