Risk Assessment and Control of Microbial Corrosion in Submarine Pipelines for Oil-Gas-Water Multiphase Transmission

WANG Xiaolong; ZHU Wensheng; WANG Xiaodong; YUE Zongling; HE Yuan; YU Haitao; ZHAO Yongping; WANG Hongxuan

doi:10.7643/ issn.1672-9242.2025.10.010

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (10) : 79-85. DOI: 10.7643/ issn.1672-9242.2025.10.010

Ships and Marine Engineering Equipment

Risk Assessment and Control of Microbial Corrosion in Submarine Pipelines for Oil-Gas-Water Multiphase Transmission

WANG Xiaolong¹, ZHU Wensheng¹, WANG Xiaodong², YUE Zongling², HE Yuan², YU Haitao¹, ZHAO Yongping¹, WANG Hongxuan¹

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Abstract

The work aims to assess and control the risk of microbiologically influenced corrosion in submarine pipelines. On-site monitoring and indoor high-temperature and high-pressure simulation experiments were utilized to conduct research on microbiologically influenced corrosion risk assessment, corrosion inhibition strategies, and detection techniques. After a low pH bactericide with a concentration of 500 mg/L was added to the submarine pipeline flow, although the bactericidal effect was significant, it not only significantly reduced the pH value of the submarine pipeline flow, but also had a significant adverse effect on the performance evaluation results of the corrosion inhibitor under high-temperature and high-pressure simulation conditions. There was a significant difference in the microbial culture results between the on-site flow temperature and 35 ℃ conditions. The evaluation of bactericide effectiveness should take into account not only its bactericidal capability but also its impact on pH and compatibility with corrosion inhibitors or other chemical additives. Since temperature has a significant effect on microbial activity, microbial monitoring should be conducted both at 35 ℃ and at the field flow temperature within ±5 ℃.

Key words

submarine pipeline / microbial corrosion / risk assessment

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WANG Xiaolong, ZHU Wensheng, WANG Xiaodong, YUE Zongling, HE Yuan, YU Haitao, ZHAO Yongping, WANG Hongxuan. Risk Assessment and Control of Microbial Corrosion in Submarine Pipelines for Oil-Gas-Water Multiphase Transmission[J]. Equipment Environmental Engineering. 2025, 22(10): 79-85 https://doi.org/10.7643/ issn.1672-9242.2025.10.010

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