Bacterial diversity in water injection systems of Brazilian offshore oil platforms |
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Authors: | Elisa Korenblum Érika Valoni Mônica Penna Lucy Seldin |
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Institution: | 1. Instituto de Microbiologia Prof. Paulo de Góes, UFRJ, CCS, Bloco I, Ilha do Fund?o, Rio de Janeiro, RJ, Brazil 2. CENPES, PETROBRAS, Ilha do Fund?o, Rio de Janeiro, RJ, Brazil 3. Laboratório de Genética de Microrganismos, Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco I, Ilha do Fund?o, CEP 21941-590, Rio de Janeiro, RJ, Brazil
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Abstract: | Biogenic souring and microbial-influenced corrosion is a common scenario in water-flooded petroleum reservoirs. Water injection
systems are continuously treated to control bacterial contamination, but some bacteria that cause souring and corrosion can
persist even after different treatments have been applied. Our aim was to increase our knowledge of the bacterial communities
that persist in the water injection systems of three offshore oil platforms in Brazil. To achieve this goal, we used a culture-independent
molecular approach (16S ribosomal RNA gene clone libraries) to analyze seawater samples that had been subjected to different
treatments. Phylogenetic analyses revealed that the bacterial communities from the different platforms were taxonomically
different. A predominance of bacterial clones affiliated with Gammaproteobacteria, mostly belonging to the genus Marinobacter (60.7%), were observed in the platform A samples. Clones from platform B were mainly related to the genera Colwellia (37.9%) and Achromobacter (24.6%), whereas clones obtained from platform C were all related to unclassified bacteria. Canonical correspondence analyses
showed that different treatments such as chlorination, deoxygenation, and biocide addition did not significantly influence
the bacterial diversity in the platforms studied. Our results demonstrated that the injection water used in secondary oil
recovery procedures contained potentially hazardous bacteria, which may ultimately cause souring and corrosion. |
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