High-minerality water is neutralized by adding sodium hydroxide
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I am at an oil field in the Middle East, where the crude oil produced is transported via pipelines to CPF. There, oil, gas, and water are separated through desalination and dewatering processes. Since the oil here is sulfur-containing and has a mineralization level of 50,000–200,000 ppm, NaOH is added during water treatment to adjust the pH from around 6.0 to 7.0–7.5. The treated water is then sent for external transportation; however, the pipelines used for this purpose are suffering from severe corrosion. What is the main cause of this problem? Is it related to the addition of too much NaOH?
It’s not that too much was added, but rather too little – the pH reached 8. If there is excess oxygen, deoxygenation is also required.