Effects of light components on the heavy-oil thermal recovery during processes of steam drive and steam assisted gravity drainage (SAGD) were studied by numerical simulation. The result shows that light components inside a steam chamber tend to move towards thermal fronts and aggregate there at the upper part of the steam chamber because of gravity, which can increase the local oil mobility. Influences of the light component volatility on the oil production depend upon types of the thermal recovery. For example, this influence in the steam drive process is more obvious than that in the SAGD process. Based upon the numerical simulation, volatility effects of different chemical compositions and contents of light components on the oil production efficiency were also analyzed. The result indicates that the volatility effect of light components can be ignored in the thermal recovery simulation of heavy-oil reservoirs when light components have relatively large molecular weight and a small amount.
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2012, Vol. 33 
