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Research on casing damage risk early warning technology based on MIT-MTT logging and 16S rRNA gene analysis
Shuoliang Wang1, Shiqi Wang1, Congcong Li2
1School of Energy, Faculty of Engineering, China University of Geosciences, Beijing, China.
Frontiers in Microbiology
|December 31, 2025
Summary
This study links oil well casing damage to specific microbial communities, identifying sulfate-reducing bacteria as key culprits. Monitoring these bacteria offers a new way to prevent oil well corrosion.
Area of Science:
- Petroleum Engineering
- Microbiology
- Corrosion Science
Background:
- Oil well casing damage due to corrosion is increasing, impacting oil recovery and making identification difficult.
- Existing methods struggle to differentiate casing damage from water breakthrough due to similar water cut trends.
Purpose of the Study:
- To investigate the relationship between oil well casing damage and microbial community composition.
- To identify the primary microbial factors responsible for casing corrosion.
- To propose a novel method for monitoring and preventing oil well corrosion.
Main Methods:
- Integrated logging technology: Multi-Finger Imaging Tool (MIT) and Magnetic Thickness Tool (MTT).
- Microbial analysis: 16S rRNA gene sequencing of produced fluids.
- Correlation analysis between casing damage severity, depth, and microbial community structure.
Main Results:
- Significant differences in microbial communities were observed in high-corrosion zones at various depths.
- Sulfate-reducing bacteria (SRB) abundance increased with casing damage severity.
- Thermophilic bacteria, particularly Thermotogata, were more abundant in deeper zones.
- SRB primarily belonged to Proteobacteria, Bacillota, Thermotogata, and Thermodesulfobacteriota.
Conclusions:
- Sulfate-reducing bacteria are the main microbial agents causing metal corrosion in oil well casings.
- Microbial community structure analysis provides a novel method for monitoring biometal corrosion in production wells.
- Secondary sealing treatments effectively reduced SRB proportions, mitigating corrosion.
