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Quantification of Microbiologically Influenced Corrosion in Injection Water Pipelines

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MIC-causing microorganisms were investigated in a 16” diameter and 9.6 km long injection water pipeline. Nitrate was added to the water and pigging debris from the pipeline showed that both sulfate-reducing bacteria (SRB), nitrate-utilizing bacteria, and methanogens were present in numbers of 105 – 106 cells/g.

Product Number: 51317--9343-SG
ISBN: 9343 2017 CP
Author: Uffe Thomsen
Publication Date: 2017
Industry: Pipelines, Tanks, and Underground Systems
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Pipelines for transferring pressurized seawater constitute a significant part of the network for enhancing oil recovery in many offshore oilfields. To maintain the integrity of the system it is important to mitigate corrosion in the pipeline which consequently may cause the operational pressure to be lowered or a worst case scenario a pipeline failure. Hence water treatment is essential to mitigate corrosion though the potential for microbiologically influenced corrosion (MIC) in injection water pipelines is assumed to be lower compared to oil or multiphase pipelines where nutrients are abundant and a higher temperature facilitates microbiological growth.Presence and activity of MIC-causing microorganisms were investigated in a 16” diameter and 9.6 km long injection water pipeline from the Dan FF to Halfdan DA platforms. Sampling of pigging debris from the pipeline showed that both sulfate-reducing bacteria and methanogens were present in significant numbers of 10^5 – 10^6 cells/g. Activity measurements showed that despite relative low temperatures the potential for growth was present in the pipeline. Quantifying the potential pit generation rate at the low temperatures (approximately 20 °C) was implemented in a model to obtain more accurate determination of the MIC risk in injection water pipelines.

Key words: Pipelines, Microbiologically Influenced Corrosion (MIC), Mitigation, Danish Sector of the North Sea, sulfate-reducing bacteria (SRB), methanogens, qPCR, Reverse Transcriptase qPCR (RT-qPCR), cell specific activity, MIC risk management, nitrate injection.

 

Pipelines for transferring pressurized seawater constitute a significant part of the network for enhancing oil recovery in many offshore oilfields. To maintain the integrity of the system it is important to mitigate corrosion in the pipeline which consequently may cause the operational pressure to be lowered or a worst case scenario a pipeline failure. Hence water treatment is essential to mitigate corrosion though the potential for microbiologically influenced corrosion (MIC) in injection water pipelines is assumed to be lower compared to oil or multiphase pipelines where nutrients are abundant and a higher temperature facilitates microbiological growth.Presence and activity of MIC-causing microorganisms were investigated in a 16” diameter and 9.6 km long injection water pipeline from the Dan FF to Halfdan DA platforms. Sampling of pigging debris from the pipeline showed that both sulfate-reducing bacteria and methanogens were present in significant numbers of 10^5 – 10^6 cells/g. Activity measurements showed that despite relative low temperatures the potential for growth was present in the pipeline. Quantifying the potential pit generation rate at the low temperatures (approximately 20 °C) was implemented in a model to obtain more accurate determination of the MIC risk in injection water pipelines.

Key words: Pipelines, Microbiologically Influenced Corrosion (MIC), Mitigation, Danish Sector of the North Sea, sulfate-reducing bacteria (SRB), methanogens, qPCR, Reverse Transcriptase qPCR (RT-qPCR), cell specific activity, MIC risk management, nitrate injection.

 

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This paper pertains to a study of an API 5L X-60, Carbon steel, injection water pipeline, which failed prematurely in 4 years after commissioning due to under-deposit corrosion. A detailed study was carried out to investigate the failure causes.

 
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