Materials selection is critical to ensure the life expectancy and cost-effectiveness of smart well completions in conjunction with expandable casing technology in Saudi Aramco re-entry multilateral oil wells for effective hydrocarbon recovery. Linking these two leading-edge technologies, Saudi Aramco has successfully completed more than 20 oil producing wells since 2004. Knowing well corrosivity and corrosion resistance of materials is critical in selecting cost-effective downhole equipment. This paper proposes a guideline for materials selection of downhole production tubing in oil and gas producing re-entry wells for maximum reservoir contacts, based on results of field and laboratory corrosion studies in sweet and sour services.

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