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《Oil Drilling & Production Technology》 2010-S1
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Experimental study on critical flow saturation in condensate gas reservior development

YANG Haitao,WANG Dong,LV Jing,YUAN Jinliang(Yakela Gas Production Plant of Northwest Oilfield Company,SINOPEC,Kuqa 842017,China)  
It is generally believed that the condensate oil drops out of the formation when the formation pressure is below the dew point pressure during natural depletion of gas condensate reservoir.It can not flow until the critical flow saturation is reached,when its saturation usually remains high.In other words,condendate oil is able to flow and be withdrawn merely when it is saturated.However,the experimental study demonstrates that less saturated condensate oil can flow after dropping out when the formation pressure is below the dew point pressure.And the critical flow saturation keeps changing.When critical flow saturation is reached,partial condensate oil begins to flow.With the pressure damping,more condensate oil will drops out,which causes the saturation moving up.The study also finds that condensate oil flowing is related to drawdown pressure.If it is far away from immediate vicinity of wellbore,with less draw-down pressure and gas phase flow velocity,the condensate oil might not flow even though the critical flow saturation is reached,but when drawdown pressure comes to specified value.This finding contributes to preparing scheme for enhanced oil recovery of condensate oil.
【CateGory Index】: P618.13
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