In SAGD operation the start-up phase is intended to establish inter immobile fluid reservoir.Establishing the communication early and uniformly along a SAGD well pair allows one to achieve a quick ramp up to the targeted peak production.In an ideal case steam chamber should occur with parallel wellbores in a homogeneous reservoir.In reality the wellbore undulation and reservoir heterogeneity will lead to non-uniform start steam chamber,and delayed production ramp the start-up operation.This paper evaluates the effects of wellbore undulation on the start-up of SAGD process.The STARS'FlexWell model was used to assess the effects of wellbore undulation,wellbore fluid heating and wellbore/grid alignment.The simulation reveals localized steam chamber initiation due to wellbore undulation and delayed production ramp-up.
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