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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.
Biocorrosion or microbiologically influenced corrosion (MIC) is a major problem in many industries, especially the oil and gas industry. Biofilms are the culprits of MIC. In this work, D-amino acids were used to enhance two biocides, namely alkyldimethylbenzylammonium chloride (ADBAC) and tributyl tetradecyl phosphonium chloride (TTPC), to treat a tough and corrosive field biofilm consortium on C1018 carbon steel coupons. An equi-mass D-amino acid mixture (“D-mix”) of four D-amino acids (Dmethionine, D-tyrosine, D-leucine, and D-tryptophan) at a total concentration of 50 ppm (w/w) was tested. The cocktails of 60 ppm ADBAC + 50 ppm D-mix and 40 ppm TTPC + 50 ppm D-mix both achieved a 3-log reduction of the sessile cell count of sulfate reducing bacteria (SRB) in the 7-day biofilm prevention test compared with a 1-log reduction achieved by 60 ppm ADBAC and 40 ppm TTPC alone separately. In the 3-hour biofilm removal test that started with mature biofilms on C1018 carbon steel coupon surfaces, the cocktails of 150 ppm ADBAC + 50 ppm D-mix and 100 ppm TTPC + 50 ppm D-mix both achieved a 2-log reduction compared with a 1-log reduction achieved by 150 ppm ADBAC and 100 ppm TTPC alone separately. In all the tests, D-mix alone showed no log reduction. Scanning electron microscope images and confocal laser scanning microscope images supported the results.
Key words: downloadable, biocide, D-amino acid, biofilm, microbiologically influenced corrosion
An oil transmission pipeline in the Eagle Ford area was being treated with 150ppm of active biocide based on a five percent water hold up but good control of the microbial population was not being maintained.
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This paper presents the latest laboratory results on iron sulfide dissolver evaluation. The recently developed dissolvers were studied for their dissolving powers using iron sulfide scale solids and the corrosion rate to mild steel at elevated temperature. Based on these results, the technical gaps and future developments for iron sulfide dissolvers are discussed.
This study describes a laboratory test system which was specifically developed to assess the ability of biocides to lower microbial corrosion rates. It was found that the common oilfield biocides THPS and glutaraldehyde, dosed at concentrations of 300 ppm for 4 hours weekly over 5 weeks, could reduce MIC rates from 109.7 mpy to as low as 4.3 mpy