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07512 Corrosion as a Side Effect during Nitrate Treatment of Produced Water and Aquifer Water Injection

Picture for 07512 Corrosion as a Side Effect during Nitrate Treatment of Produced Water and Aquifer Water Inject
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Product Number: 51300-07512-SG
ISBN: 07512 2007 CP
Author: Janiche Beeder, Tore Roberg Andersen, Turid Liengen, Terje Torsvik, and Karine Dronen
Publication Date: 2007
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Nitrate treatment is well documented as a mitigation method for reservoir souring, however, field trials have indicated that increased corrosion could be a possible side effect of nitrate treatment. This paper describes results from offshore side stream test rigs and laboratory investigation where a mixture of produced water and aquifer water was treated with nitrate. A corrosion rig was developed where the different combinations of produced water and Utsira aquifer water were investigated with respect to corrosion and microbial activity under offshore conditions. Corrosion increased when nitrate was added in combination with CO2, from 0.01 to > 1 mm year. The microbial community changed when nitrate was added, and the presence of H2 consuming bacteria indicates that a cathodic reaction could be a possible corrosion mechanism.
Nitrate treatment is well documented as a mitigation method for reservoir souring, however, field trials have indicated that increased corrosion could be a possible side effect of nitrate treatment. This paper describes results from offshore side stream test rigs and laboratory investigation where a mixture of produced water and aquifer water was treated with nitrate. A corrosion rig was developed where the different combinations of produced water and Utsira aquifer water were investigated with respect to corrosion and microbial activity under offshore conditions. Corrosion increased when nitrate was added in combination with CO2, from 0.01 to > 1 mm year. The microbial community changed when nitrate was added, and the presence of H2 consuming bacteria indicates that a cathodic reaction could be a possible corrosion mechanism.
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