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.