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51316-7194-Monitoring and Risk Assessment of Microbiological Influenced Corrosion in Offshore Pipelines

The monitoring program used in the Danish Sector of the North Sea to manage microbiologically influenced corrosion (MIC) risk assessment for seven pipelines. Quantitative data on microbial activity was obtained from pigging debris using real-time polymerase chain reaction of MIC-causing microorganisms.

Product Number: 51316-7194-SG
ISBN: 7194 2016 CP
Author: Uffe Thomsen
Publication Date: 2016
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Offshore oil production typically include a pipeline network for transferring pressurized injection water and multiphase liquids. It is essential for production that integrity is maintained to ensure a long safe lifetime of the pipelines and keeping downtime to a minimum. Microbiological influenced corrosion (MIC) causes development of pitting and internal channeling corrosion features which pose a challenge to the pipeline integrity. MIC risk assessment requires a monitoring program to determine numbers and activity of sulfate-reducing prokaryotes and methanogens. To provide the most representative samples pigging debris were collected regularly from pipelines in the Danish Sector of the North Sea. Quantitative data on microbial activity using qPCR/RT-qPCR of MIC-causing microorganisms in seven pipelines and model prediction of MIC risk showed that the highest risk was present in multiphase pipelines operated at inlet temperatures in the range 53–66 °C. The predicted maximum pitting corrosion rate was <0.51 mm/year and the estimated pigging frequency was 37 days to counteract MIC. In other pipelines transferring injection water or crude oil the MIC risk was at least ten times lower. As part of the MIC risk management inline inspections of several high risk MIC pipelines are planned with the aim to improve MIC mitigation.Key words: Pipelines Microbiologically Influenced Corrosion (MIC) Mitigation Danish Sector of the North Sea sulfate-reducing Bacteria (SRB) methanogens batch biocide injection continuous biocide injection qPCR Reverse Transcriptase qPCR (RT-qPCR) cell specific activity (CSA) index MIC risk management.

Keywords: downloadable, Pipelines, microbiologically Influenced Corrosion (MIC), mitigation, North Sea, sulfate-reducing bacteria, methanogens, biocide injection, qPCR, cell specific activity, risk management

 

 

Offshore oil production typically include a pipeline network for transferring pressurized injection water and multiphase liquids. It is essential for production that integrity is maintained to ensure a long safe lifetime of the pipelines and keeping downtime to a minimum. Microbiological influenced corrosion (MIC) causes development of pitting and internal channeling corrosion features which pose a challenge to the pipeline integrity. MIC risk assessment requires a monitoring program to determine numbers and activity of sulfate-reducing prokaryotes and methanogens. To provide the most representative samples pigging debris were collected regularly from pipelines in the Danish Sector of the North Sea. Quantitative data on microbial activity using qPCR/RT-qPCR of MIC-causing microorganisms in seven pipelines and model prediction of MIC risk showed that the highest risk was present in multiphase pipelines operated at inlet temperatures in the range 53–66 °C. The predicted maximum pitting corrosion rate was <0.51 mm/year and the estimated pigging frequency was 37 days to counteract MIC. In other pipelines transferring injection water or crude oil the MIC risk was at least ten times lower. As part of the MIC risk management inline inspections of several high risk MIC pipelines are planned with the aim to improve MIC mitigation.Key words: Pipelines Microbiologically Influenced Corrosion (MIC) Mitigation Danish Sector of the North Sea sulfate-reducing Bacteria (SRB) methanogens batch biocide injection continuous biocide injection qPCR Reverse Transcriptase qPCR (RT-qPCR) cell specific activity (CSA) index MIC risk management.

Keywords: downloadable, Pipelines, microbiologically Influenced Corrosion (MIC), mitigation, North Sea, sulfate-reducing bacteria, methanogens, biocide injection, qPCR, cell specific activity, risk management

 

 

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