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Case Study for MIC Evaluation and Mitigation in Two Argentinian Oilfields

A biocide efficacy study was conducted using field water samples and associated indigenous microorganisms as the test inocula. Thirteen biocide systems were evaluated to determine an excellent choice for disinfecting (rapid kill), to alleviate bio-burden and result in longer term protection.

 

Product Number: 51317--9476-SG
ISBN: 9476 2017 CP
Author: Emerentiana Sianawati
Publication Date: 2017
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Microbially Influenced Corrosion (MIC) was suspected to be the root cause of corrosion problems in Pan American Energy (PAE) oilfields in the San Jorge Gulf area. An integrated and innovative program was proposed consisting of microbial audits with advanced diagnostics analyses and biocide evaluations under field conditions. qPCR and next generation sequencing results indicated the increased abundance of Bacteria and Archaea from production wells to oil storage tanks strongly suggesting that microorganisms played a major role in the corrosion failures. Consequently a biocide efficacy study was conducted using field water samples and associated indigenous microorganisms as the test inocula. Thirteen biocide systems including non-traditional products to oil and gas market at three different concentrations were evaluated with an ideal performance of disinfecting (rapid kill) to alleviate initial bio-burden along with a longer term protection for the down-hole reservoir. Two formulations PAE–A (Glutaraldehyde + Preservative)) and PAE-E (THPS + Preservative) were found to be effective and meet the criteria of rapid kill and long term protection. The microbial solution PAE-E is in the process of being validated in a three month field trial.

Key words: MIC, microbial audit, qPCR, NGS, bacteria, archaea, microorganism, biocide, glutaraldehyde, THPS, THNM, long term protection

Microbially Influenced Corrosion (MIC) was suspected to be the root cause of corrosion problems in Pan American Energy (PAE) oilfields in the San Jorge Gulf area. An integrated and innovative program was proposed consisting of microbial audits with advanced diagnostics analyses and biocide evaluations under field conditions. qPCR and next generation sequencing results indicated the increased abundance of Bacteria and Archaea from production wells to oil storage tanks strongly suggesting that microorganisms played a major role in the corrosion failures. Consequently a biocide efficacy study was conducted using field water samples and associated indigenous microorganisms as the test inocula. Thirteen biocide systems including non-traditional products to oil and gas market at three different concentrations were evaluated with an ideal performance of disinfecting (rapid kill) to alleviate initial bio-burden along with a longer term protection for the down-hole reservoir. Two formulations PAE–A (Glutaraldehyde + Preservative)) and PAE-E (THPS + Preservative) were found to be effective and meet the criteria of rapid kill and long term protection. The microbial solution PAE-E is in the process of being validated in a three month field trial.

Key words: MIC, microbial audit, qPCR, NGS, bacteria, archaea, microorganism, biocide, glutaraldehyde, THPS, THNM, long term protection

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