Injection water on all Gullfaks platforms have been treated with nitrate to reduce H2S production caused by Sulfate Reducing Bacteria (SRB). Results from Gullfaks B (GFB) and Gullfaks C (GFC), which have had the most stable injection and production during the treatment period, show a decrease in H2S production, when the treated injection water reaches the producers. In the water injection systems the change from biocide treatment to nitrate treatment resulted in more than 1000-fold reduction in SRB number and 10-20-fold reduction in sulphate respiration activity. Following nitrate injection, the SRB population was replaced with an equally large population of NRB in the biofilm and corrosion level in the water injection system dropped by more than 50%. This result corresponds well with the observations from a similar water injection treatment at Veslefrikk.

Subject
Water, Hydrogen concentration, Bacterial growth, Corrosion rate, Sulfates, Corrosion detection, Nitrate injection, Acetates, Biofilms, Nitrates, Bacteria, Water injection, Risk reduction
Keywords:
H2S, reservoir souring, corrosion, Gullfaks, nitrate, bacteria, SRB, NRB
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2004
Association for Materials Protection and Performance (AMPP)
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