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Effect of Oxygen Excursion On SCC Resistance of Tubing Materials

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Oil and gas production from highly saline reservoirs can present challenges to the completion materials. The most saline fields often require downhole injection of (low chloride) wash water to dilute the produced water and mitigate the threat of halite precipitation on the production tubulars. The present paper investigates the threats associated with the co-mingled wash water and production fluids with respect to common completion materials.

Product Number: 51323-18779-SG
Author: Luciana Intiso, Yvi Le Guen, Federica Sammartino, Roberto Morana, Lee Smith
Publication Date: 2023
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$20.00

Oil and gas production from highly saline reservoirs can necessitate the injection of water (wash water) to dilute the formation water and prevent halite precipitation and reduced flow through the production system. This operation may represent a potential threat due to the dissolved oxygen in the wash water, which can be exacerbated by H2S from the reservoir and/or lift gas. The present paper investigates the threats associated with the co-mingled wash water, formation fluids and lift gas with respect to common completion materials. Several scenarios were investigated:
• Routine production (produced water has moderate chloride concentration and very low dissolved oxygen)
• An interruption in the supply of wash water (i.e. produced water comprises high chloride formation water alone)
• An interruption in the supply of wash water, followed by wash water with high O2 concentration supply (halite precipitation on the completion materials, followed by exposure to produced water comprising higher content of dissolved oxygen i.e. out-of-specification wash water)
Among these, the latest is the worst-case scenario that could occur (in the absence of specific procedures and equipment trips that would otherwise prevent it). Stress Corrosion Cracking (SCC) and general and localized corrosion resistance of UNSa N07718, UNS N08535 and UNS S39274 were evaluated through a laboratory testing program.

Oil and gas production from highly saline reservoirs can necessitate the injection of water (wash water) to dilute the formation water and prevent halite precipitation and reduced flow through the production system. This operation may represent a potential threat due to the dissolved oxygen in the wash water, which can be exacerbated by H2S from the reservoir and/or lift gas. The present paper investigates the threats associated with the co-mingled wash water, formation fluids and lift gas with respect to common completion materials. Several scenarios were investigated:
• Routine production (produced water has moderate chloride concentration and very low dissolved oxygen)
• An interruption in the supply of wash water (i.e. produced water comprises high chloride formation water alone)
• An interruption in the supply of wash water, followed by wash water with high O2 concentration supply (halite precipitation on the completion materials, followed by exposure to produced water comprising higher content of dissolved oxygen i.e. out-of-specification wash water)
Among these, the latest is the worst-case scenario that could occur (in the absence of specific procedures and equipment trips that would otherwise prevent it). Stress Corrosion Cracking (SCC) and general and localized corrosion resistance of UNSa N07718, UNS N08535 and UNS S39274 were evaluated through a laboratory testing program.

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Determination Of Oxygen Limits For Corrosion Resistant Alloys (Cras) In Oil & Gas Produced Water Based On Electrochemical Test Methods – Part 1

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Impact Of Dissolved Oxygen Concentration In Seawater Injection Well On The Localized Corrosion Resistance Of Low Stainless Steel Grades

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Author: Charles Leballeur, Nicolas Larché, Perry Ian Nice, Bruce Cowe
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Stainless steels have been used for a wide range of applications in seawater. They are known to be susceptible to localized corrosion under given conditions. This is often the limiting factor for the use of stainless steels for seawater applications.
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51314-4299-Impact of Oxygen Ingress in CO2 Corrosion of Mild Steel

Product Number: 51314-4299-SG
ISBN: 4299 2014 CP
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