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Control of Microbial Sulfide Production with Nitrate and Biocide in Oilfield-Simulating Bioreators

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Advisor
Voordouw, Gerrit
Author
Xue, Yuan (Fiona)
Accessioned
2015-01-28T23:05:55Z
Available
2015-02-23T08:00:40Z
Issued
2015-01-28
Submitted
2015
Other
Sulfate-reducing bacteria
Nitrate
Biocide
Bioreactors
Synergy
Subject
Microbiology
Type
Thesis
Metadata
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Abstract
Souring, the production of sulfide by sulfate-reducing bacteria in oil fields, can be remediated by nitrate injection. However, continuous amendment of sulfate-containing injection water with nitrate leads to microbial zonation. The combination of nitrate and biocide that may break this zonation and control souring more effectively was investigated here using bioreactors injected with excess volatile fatty acids and 2 mM sulfate or 2 mM sulfate and 2 mM nitrate. Biocide was pulsed with long duration (5 days) at low concentrations or short duration (1 h) at high concentrations. The success of these strategies was determined by the time needed for sulfide recovery. The results indicated that pulsed biocide can be synergistic with continuous nitrate. However, it depends on the type of biocide, its concentration, and the length of the pulse. Hence, pulsed biocide can improve souring control with continuous nitrate injections, if the appropriate product and injection strategy are chosen.
Corporate
University of Calgary
Faculty
Graduate Studies
Doi
http://dx.doi.org/10.5072/PRISM/25454
Uri
http://hdl.handle.net/11023/2040
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