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51313-02768-Microbial Community Composition and MIC in Water systems for Bitumen Production by SAGD

Product Number: 51313-02768-SG
ISBN: 02768 2013 CP
Author: Hyung Soo Park
Publication Date: 2013
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 Brackish subsurface water is used for the production of bitumen by SAGD (steam-assisted gravity drainage). Internal corrosion risk exists in the pipeline system transporting this water from the subsurface to the steam-generating facility. These waters contained high concentrations of bicarbonate and some sulfate but no nitrate. Water treatment included addition of sodium bisulfite (SBS) as an oxygen scavenger. Pipe sections representing corrosion failures were obtained upstream and downstream from the SBS injection point. The microbial communities in these sections were dominated by methanogens and SRB respectively. The SRB included Desulfocapsa known to be able to disproportionate bisulfite to sulfate and sulfide. Incubation of corrosion coupons in waters dominated by SRB under methanogenic conditions (absence of sulfate) gave a sessile community dominated by a variety of genera of hydrogenotrophic methanogens which contributed to corrosion. Hence the sessile microbial compositions in these pipelines are dynamic changing rapidly with conditions (presence or absence of bisulfite or sulfate). Unfortunately both sets of conditions appeared to be corrosive. 

 Brackish subsurface water is used for the production of bitumen by SAGD (steam-assisted gravity drainage). Internal corrosion risk exists in the pipeline system transporting this water from the subsurface to the steam-generating facility. These waters contained high concentrations of bicarbonate and some sulfate but no nitrate. Water treatment included addition of sodium bisulfite (SBS) as an oxygen scavenger. Pipe sections representing corrosion failures were obtained upstream and downstream from the SBS injection point. The microbial communities in these sections were dominated by methanogens and SRB respectively. The SRB included Desulfocapsa known to be able to disproportionate bisulfite to sulfate and sulfide. Incubation of corrosion coupons in waters dominated by SRB under methanogenic conditions (absence of sulfate) gave a sessile community dominated by a variety of genera of hydrogenotrophic methanogens which contributed to corrosion. Hence the sessile microbial compositions in these pipelines are dynamic changing rapidly with conditions (presence or absence of bisulfite or sulfate). Unfortunately both sets of conditions appeared to be corrosive. 

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