Abstract: In order to study the heat transfer enhancing mechanism of deep steam with non condensate gas in steam flooding, a 1D physical sand pack model was used to conduct a non condensate gas assisted steam flooding simulation experiment. The effect of non condensate gas on the steam condensation heat transfer was analyzed by a laboratory condensation heat transfer experiment. Experiment indicates that the pure steam injection shows a high steam medium heat exchange rate and a relatively small heat spread range. With the adding of non condensate gas, the steam heat spread range increases and the deep reservoir is heated, which effectively improve the steam heat utilization rate. Comparing with pure steam condensation, the growth and shedding speeds of condensed liquid drop slow down after adding non condensate gas, which leads to the generation of relatively large liquid drop. The liquid drop holds up the steam heat transfer and the non condensate gas suppresses the steam condensation. A thorough understanding of the non condensate gas hold up mechanism on steam heat transfer could provide certain guidance for the steam heat transfer enhancing and steam heat utilization improvement.

Key words: steam flooding, flue gas, deep heating, condensation heat transfer, Shengli Oilfield