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In this paper, we will present a study that is aimed at understanding the relative rates of reactions between oxidizers and bacteria, iron sulfide, H2S, other oxidizable compounds present in produced waters and the overall impact on metal corrosion.
The use of oxidizers as in the oil and gas industry has been increasing in recent years. Peracetic acid in particular has been gaining acceptance as a very cost effective and superior biocide for water treatment applications. Though primarily used as biocides; oxidizers in general are multi-functional chemistries. Some of the other functionalities include iron sulfide and H2S control as well as water clarification. Although very effective in controlling MIC If not properly dosed the acid and/ or oxygen from oxidizers can cause corrosion. In this paper we will present a study that is aimed at understanding the relative rates of reactions between oxidizers and bacteria iron sulfide H2S other oxidizable compounds present in produced waters and the overall impact on metal corrosion. The results will aide in defining a corrosion control program for water treatment systems where oxidizers are used for preventing microbial influenced corrosion.
Key words: water treatment, MIC, peracetic acid, iron sulfide, H2S, carbon steel, corrosion, multi-functional chemistry
We describe the advancement of an activity-based quantitative polymerase chain reaction (qPCR) assay which can distinguish live from dead corrosion influencing microorganisms in oil and gas pipeline environments. We discuss the limitations and possible future optimization methods for Propidium monazide-qPCR techniques in the industry.
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To study the effect of repeated biocide treatments to mitigate microbiologically influenced corrosion (MIC), we used a Center for Disease Control (CDC) biofilm reactor to generate and remediate corrosive biofilms on carbon steel coupons grown from a produced water sample from a salt water disposal (SWD).