MADALINA ANDREI, BRANDUSA GHIBAN, VALERIU RUCAI BACTERIAL ACTIVITY IN A DEPOSIT FROM A RESIDUAL INJECTION WATER PIPELINE
This research was conducted on a deposit sampled from a residual injection water pipeline, where corrosion problems identified on metallic equipment have been suspected to be caused by microbiological activity. The residual injection water was also analyzed to confirm the bacterial activity inside the pipeline. Microbiological activity is internationally recognized as a significant contributor to corrosion problems of oilfield equipment, being characterized by rapidity, severity and localized nature. The commonly encountered deposits in water injection pipelines include salts, corrosion products, microbiological mass, suspended matter and water. MIC mitigation methods, as biocide treatment, cannot be implemented without evaluation and confirmation of bacterial activity in the deposit. Several techniques were performed, as SEM and EDS analysis of the deposit to characterize the morphology and elemental composition and microbiological analysis and microscopic examination of the biofilm contained by the deposit, which demonstrated the presence of bacteria communities responsible for MIC.