A number of operations characteristics of Steam Assisted Gravity Drainage (SAGD) projects, such as production rates of hydrogen sulphide and carbon dioxide, silica dissolution, and scale production are strong functions of steam zone pressure.

The present paper explores the pressure dependence of acid gas (CO2 and H2S) production, acid gas quality, and the associated potential for the need to recover sulphur in commercial SAGD projects. Further aspects explored are silica production, carbonate scaling, and the formation of unusual scales in SAGD facilities, as a function of steam zone pressure.

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