Mechanisms Involved in Microbially Enhanced Oil Recovery |
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Authors: | Krista M Kaster Aksel Hiorth Grethe Kjeilen-Eilertsen Kate Boccadoro Arild Lohne Harald Berland Arne Stavland Odd Gunnar Brakstad |
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Institution: | (1) Esbjerg Institute of Technology, Aalborg University, Aalborg, Denmark;(2) Esbjerg Institute of Technology, Aalborg University, Esbjerg, Denmark |
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Abstract: | Microbial enhanced oil recovery (MEOR) represents a possible cost-effective tertiary oil recovery method. Although the idea
of MEOR has been around for more than 75 years, even now little is known of the mechanisms involved. In this study, Draugen
and Ekofisk enrichment cultures, along with Pseudomonas spp. were utilized to study the selected MEOR mechanisms. Substrates which could potentially stimulate the microorganisms
were examined, and l-fructose, d-galacturonic acid, turnose, pyruvic acid and pyruvic acid methyl ester were found to be the best utilized by the Ekofisk
fermentative enrichment culture. Modelling results indicated that a mechanism likely to be important for enhanced oil recovery
is biofilm formation, as it required a lower in situ cell concentration compared with some of the other MEOR mechanisms. The
bacterial cells themselves were found to play an important role in the formation of emulsions. Bulk coreflood and flow cell
experiments were performed to examine MEOR mechanisms, and microbial growth was found to lead to possible alterations in wettability.
This was observed as a change in wettability from oil wet (contact angle 154°) to water wet (0°) due to the formation of biofilms
on the polycarbonate coupons. |
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