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A peptide (labeled as “Peptide A”) was used to enhance tetrakis hydroxymethyl phosphonium sulfate biocide to treat the corrosive sulfate reducing bacterium Desulfovibrio vulgaris and a tough field biofilm consortium on C1018 carbon steel coupons.
Problematic biofilms cause biofouling and biocorrosion (also known as microbiologically influenced corrosion or MIC). Scrubbing (or pigging in the pipeline industry) and biocide dosing are often used to mitigate biofilms. Biofilm consortia deploy various mechanisms to resist biocide treatment. Overtime biocide resistance occurs leading to dosage escalation and eventually rendering a biocide unsuitable for a particular field operation. Biocide enhancers can help overcome or slowdown the trend. In this work a novel peptide was used to enhance THPS (tetrakis hydroxymethyl phosphonium sulfate) biocide mitigation of a pure-strain biofilm and an oilfield biofilm consortium. In both biofilm prevention and biofilm removal tests the peptide at a concentration below 1 ppm (w/w) showed excellent efficacies for the mitigation of the biofilms.
Key words: biocide, peptide, biofilm, microbiologically influenced corrosion
Biocorrosion or microbiologically influenced corrosion (MIC) is a major problem in the oil and gas industry. Biofilms are the culprits of MIC. In this work, D-amino acids were used to enhance two biocides, alkyldimethylbenzylammonium chloride (ADBAC) and tributyl tetradecyl phosphonium chloride (TTPC), to treat a field biofilm consortium on C1018 carbon steel coupons.
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This paper will present corrosion inhibitor performance data using electrochemical test methods, additional laboratory testing and pilot test results to demonstrate this new inhibitor’s performance benefits, overall effectiveness and value to the water treatment market.
It was proposed to apply a modified external corrosion direct assessment process to a small station. This paper describes the technical approach which was developed in order to overcome the expected challenges.