Abstract

As oil reserves decrease, the level of difficulty to extract oil increases. With this increased difficulty, the service conditions involved in Steam Assisted Gravity Drainage (SAGD) are increasingly more aggressive. In an effort to maintain low raw material prices without sacrificing performance, duplex and superduplex stainless steels have been used for many applications to resist corrosion from chlorides, withstand extremely high pressure and still stay cost competitive. This summary of case histories shows where duplex stainless steels have been successfully utilized in the Alberta Oil Sands as well as across the globe. Duplex stainless steels have replaced leaner austenitic stainless steels and low alloy steels because of their increased corrosion resistance. In other cases, duplex and superduplex stainless steels have replaced higher nickel- chromium-molybdenum grades because of their lower cost and similar performance. For example, super duplex stainless steel has already been used as an alternate to six percent molybdenum grades in brine concentrators throughout Alberta, Canada.

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