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Produced fluids in O&G sector in general do not contain oxygen, but oxygen ingress can occur at locations. Examples of such spaces can include but not limited to vapor space in tanks, custody transfers, injection pumps, vapor recovery systems, operating pumps with faulty seals, pipelines that are not properly purged of oxygen during commissioning operations, gas lift operations, methanol use or pigging operations.This contamination of O2 in sweet/sour systems can lead to oxygen induced corrosion and may cause high general and pitting corrosion rates and failures.
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This paper provides an overview of the risk assessment methodology and how it is applied to assess and monitor the risks in conjunction with a rigorous corrosion monitoring program comprising of multiple ultrasonic sensor placements. Various case studies are presented.
Organic corrosion inhibitors (CIs) are widely employed in the oil and gas industry to protect carbon steel pipelines against internal corrosion. The high inhibition efficiency of organic CIs at extremely low concentration can be attributed to their amphiphilic molecular structures. This structure enables the formation of self-assembled films that act against corrosion via the adsorption of their hydrophilic head group on the steel substrate and the repellence of aqueous corrosive species by their hydrophobic tail. Consequently, any factors affecting the film formation of organic CIs could lead to changes in inhibition behaviors.