Microbial response to reinjection of produced water in an oil reservoir |
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Authors: | Kristine Lysnes Gunhild Bødtker Terje Torsvik Eva Ø Bjørnestad Egil Sunde |
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Institution: | (1) Centre for Integrated Petroleum Research (CIPR), Allégaten 41, Bergen, 5007, Norway;(2) Unifob Petroleum, Allégaten 41, Bergen, 5007, Norway;(3) StatoilHydro, Forusbeen 50, Stavanger, 4035, Norway;(4) Department of Mathematics, University of Bergen, Postbox 7803, Bergen, 5020, Norway |
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Abstract: | The microbial response to produced water reinjection (PWRI) in a North Sea oil field was investigated by a combination of
cultivation and culture-independent molecular phylogenetic techniques. Special emphasise was put on the relationship between
sulphate-reducing bacteria (SRB) and nitrate-reducing bacteria (NRB), and results were used to evaluate the possibility of
nitrate treatment as a souring management tool during PWRI. Samples were collected by reversing the flow of the injection
water, which provided samples from around the injection area. The backflowed samples were compared to produced water from
the same platform and to backflowed samples from a biocide-treated seawater injector, which was the previous injection water
treatment of the PWRI well. Results showed that reinjection of produced water promoted growth of thermophilic SRB. Thermophilic
fatty acid oxidising NRB and potential nitrate-reducing sulphide-oxidising bacteria were also found. The finding of thermophilic
NRB makes nitrate treatment during PWRI possible, although higher nitrate concentration will be necessary to compensate for
the increased SRB activity. |
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Keywords: | Oil reservoir Produced water Reinjection SRB NRB NR-SOB |
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