Lynelle S. Bautista Chevron USA Production Co. Eric A. Waninger Chevron Chemical Co. Bakersfield, Calif. A one-pattern steam foam field trial determined a number of recommendations to prevent the onset of downdip steam migration in new steam floods, and addressed downdip steam migration once it occurs. The trial was conducted in the Amnicola sand in the steam flood of Section 26W, Cymric field, near Bakersfield. The pattern was in an area of downdip steam migration, soon after steam injection began, as a result of well spacing (which skewed injectors closer to downdip producers) and channeling (because of vertical per...

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