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51317--9551-Identification of Compounds that Effectively Block Microbial H2S Production

We have identified a class of inhibitory molecules that abrogate sulfidogenesis in oilfield produced fluids. Bottle tests and laboratory-scale bioreactors to mimic field conditions, found that very low doses of two versions of this class of compounds were found to effectively prevent H2S generation.

 

Product Number: 51317--9551-SG
ISBN: 9551 2017 CP
Author: Brett Geissler
Publication Date: 2017
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Microbial reduction of sulfur compounds is a concern in many industries due to the toxicity and corrosivity of the chief metabolic waste product hydrogen sulfide (H2S). In the oil and gas industry production of H2S by microbes within the petroleum reservoir is extremely detrimental to production and often leads to complete shut-in of wells and entire assets due to these concerns. Hundreds of different genera of bacteria and archaea are capable of generating H2S from an array of sulfur-containing compounds although the key enzymes involved are relatively well conserved. We have identified a class of inhibitory molecules that abrogate sulfidogenesis by numerous diverse microbial populations found within oilfield produced fluids. Using bottle tests and laboratory-scale bioreactors designed to more closely mimic field conditions very low doses of two different versions of this class of compounds were found to effectively prevent H2S generation and decrease the number of sulfide-producing microbes from the population. By decreasing the amount of H2S generated these compounds are able to decrease the levels of microbiologically influenced corrosion normally associated with sulfidogenic populations of microbes.

Key words: Hydrogen sulfide, H2S, bacteria, inhibitor, MIC, reservoir souring

Microbial reduction of sulfur compounds is a concern in many industries due to the toxicity and corrosivity of the chief metabolic waste product hydrogen sulfide (H2S). In the oil and gas industry production of H2S by microbes within the petroleum reservoir is extremely detrimental to production and often leads to complete shut-in of wells and entire assets due to these concerns. Hundreds of different genera of bacteria and archaea are capable of generating H2S from an array of sulfur-containing compounds although the key enzymes involved are relatively well conserved. We have identified a class of inhibitory molecules that abrogate sulfidogenesis by numerous diverse microbial populations found within oilfield produced fluids. Using bottle tests and laboratory-scale bioreactors designed to more closely mimic field conditions very low doses of two different versions of this class of compounds were found to effectively prevent H2S generation and decrease the number of sulfide-producing microbes from the population. By decreasing the amount of H2S generated these compounds are able to decrease the levels of microbiologically influenced corrosion normally associated with sulfidogenic populations of microbes.

Key words: Hydrogen sulfide, H2S, bacteria, inhibitor, MIC, reservoir souring

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