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Enhanced Biocide Mitigation of Microbiologically Influenced Corrosion In Enhanced Oil Recovery

MIC is a problem in the oil and gas industry due to seawater injection. Biocides lead to resistance by microbes over time. In this work, D-amino acids were used to enhance the tetrakis (hydroxymethyl) phosphonium sulfate (THPS) biocide against a tough field biofilm consortium.

Product Number: 51317--9039-SG
ISBN: 9039 2017 CP
Author: RU JIA
Publication Date: 2017
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Due to the common practice of seawater injection in enhanced oil recovery (EOR) microbiologically influenced corrosion (MIC) is currently a prevalent problem in the oil and gas industry. Seawater brings in nutrients and microbes downhole. Sulfate combined with other nutrients in the seawater result in biogenic souring and MIC pitting against downhole tubing. EOR polymers may be utilized by microbes as organic carbon that promotes biofilm growth downhole under certain conditions. Periodical biocide dosing is often used to mitigate souring and MIC. Unfortunately prolonged biocide dosing leads to biocide resistance by the microbes that escalates biocide dosage over time. In this work naturally occurring D-amino acids were used to help disperse biofilms and thus reducing the tetrakis (hydroxymethyl) phosphonium sulfate (THPS) biocide dosage through synergy. Tests were carried out in 120 ml anaerobic vials using enriched reservoir fluids in the presence of EOR chemicals. A tough oilfield biofilm consortium containing various microbes including sulfate reducing bacteria was used as a model biofilm system for biocide efficacy assessment. Planktonic cell count sessile cell count biofilm image pit depth weight loss data were analyzed to show the efficacy of the biocide enhancer system for downhole application.

Key words: microbiologically influenced corrosion, enhanced oil recovery, biofilm, biocide enhancer, D-amino acid

Due to the common practice of seawater injection in enhanced oil recovery (EOR) microbiologically influenced corrosion (MIC) is currently a prevalent problem in the oil and gas industry. Seawater brings in nutrients and microbes downhole. Sulfate combined with other nutrients in the seawater result in biogenic souring and MIC pitting against downhole tubing. EOR polymers may be utilized by microbes as organic carbon that promotes biofilm growth downhole under certain conditions. Periodical biocide dosing is often used to mitigate souring and MIC. Unfortunately prolonged biocide dosing leads to biocide resistance by the microbes that escalates biocide dosage over time. In this work naturally occurring D-amino acids were used to help disperse biofilms and thus reducing the tetrakis (hydroxymethyl) phosphonium sulfate (THPS) biocide dosage through synergy. Tests were carried out in 120 ml anaerobic vials using enriched reservoir fluids in the presence of EOR chemicals. A tough oilfield biofilm consortium containing various microbes including sulfate reducing bacteria was used as a model biofilm system for biocide efficacy assessment. Planktonic cell count sessile cell count biofilm image pit depth weight loss data were analyzed to show the efficacy of the biocide enhancer system for downhole application.

Key words: microbiologically influenced corrosion, enhanced oil recovery, biofilm, biocide enhancer, D-amino acid

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