Abstract: The lined insulation tubing recovery technology was researched to address the problems of large heat loss of heavy oil and waste of resources during the heavy oil recovery process in Taha Oilfield. Based on the theory of steady state heat transfer in the wellbore and non-steady state heat transfer in formation, a mathematical model of heat transfer in the wellbore of heavy oil wells was established, and the heat preservation performance of tubings with different lining materials was evaluated, which reveals the influence of water cut, daily liquid production and depth of tubing insulated with heat preservation tubular on the temperature of the wellbore. The study shows that the tubing insulated with polyketone anticorrosion layer and aerogel insulation layer has the best thermal insulation performance, the daily fluid production and the depth of insulation tubing have a more significant impact on the wellhead temperature, and the water cut has a lesser effect on the wellhead temperature; when the daily fluid production is more than 72 t/d and the depth of insulated tubing is more than3 500 m, which satisfies the temperature requirements of heavy oil recovery. The study results clarify the feasibility of lined insulation tubing, which could provide a technical basis for the selection of lined insulation tubing in oilfield and the formulation of process parameters for heavy oil recovery.

Key words: heavy oil, heat loss, lined insulation tubing, temperature field, polyketone anticorrosion layer, aerogel insulation layer