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Ehanced oil recovery under simulated reservoir conditions using an indigenous B...
Gudiña, Eduardo J.; Pereira, Jorge F. B.; Costa, A. R.; Rodrigues, L. R.; Coutinho, J. A. P.; Teixeira, J. A.Microbial Enhanced Oil Recovery (MEOR) is potentially useful to increment oil recovery from reservoirs beyond primary and secondary recovery operations using microorganisms and their metabolites. In situ stimulation of microorganisms that produce biosurfactants and degrade heavy oil fractions reduces the capillary forces that retain the oil inside the reservoir and decreases oil viscosity, thus promoting its fl...
Production and characterization of biosurfactants produced by microorganisms is...
Pereira, Jorge F. B.; Costa, A. R.; Gudiña, Eduardo J.; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, J. A. P.Surfactants are amphiphilic molecules that comprise both hydrophilic and hydrophobic moieties, allowing the reduction the surface and interfacial tensions, as well as the formation of oil in water or water in oil emulsions. These surface-active compounds are extensively used by petroleum industries in order to reduce the capillary forces that entrapped the oil inside the reservoir. The compounds synthetized che...
A stable liquid–liquid extraction system for clavulanic acid using polymer-base...
Pereira, Jorge F. B.; Santos, Valéria Carvalho; Johansson, Hans-Olof; Teixeira, J. A.; Pessoa Junior, AdalbertoThe partitioning of Clavulanic Acid (CA) in a novel inexpensive and stable aqueous two-phase system (ATPS) composed by poly(ethylene glycol) (PEG) and sodium polyacrylate (NaPA) has been studied. The aqueous two-phase systems are formed by mixing both polymers with a salt (NaCl or Na2SO4) and an aqueous solution of CA. The stability of CA on the presence of both polymers was investigated and it was observed tha...
Characterization by electrospray ionization and tandem mass spectrometry of rha...
Pereira, Jorge F. B.; Gudiña, Eduardo J.; Dória, M. L.; Domingues, M. R. M.; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, J. A. P.In this work, biosurfactants produced by two Pseudomonas aeruginosa strains isolated from Brazilian crude oils were identified by proton nuclear magnetic resonance ((1)H NMR) and further characterized by mass spectrometry (MS) coupled with electrospray ionization (ESI) and tandem mass spectrometry (MS/MS) analysis in positive mode and their surface activities evaluated. Mono-rhamnolipids and di-rhamnolipids wer...
Enhanced oil recovery under laboratory conditions using biosurfactant-producing...
Gudiña, Eduardo J.; Pereira, Jorge F. B.; Rodrigues, L. R.; Coutinho, J. A. P.; Teixeira, J. A.Oil recovery comprises a primary phase, which produces oil using the natural pressure drive of the reservoir, and a secondary phase, which includes the injection of water to improve the flow of oil to the wellhead [1,2]. While primary recovery produces 5-10% of the original oil in place, recovery efficiencies in the secondary stage vary from 10% to 40% [1]. Most of the unrecovered oil (up to two-thirds of the t...
Microbial degradation of hydrocarbons and its applications to enhanced oil reco...
Pereira, Jorge F. B.; Gudiña, Eduardo J.; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, J. A. P.The renewed interest in Enhanced Oil Recovery (EOR) techniques as a consequence of the current oil prices is boosting the development of the Microbial Enhanced Oil Recovery (MEOR). This technique is useful to recover incremental oil from a reservoir beyond primary and secondary recovery operations and can be carried by the injection of exogenous or stimulation of indigenous microorganisms. This last approach is...
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