Chemical flooding of oil reservoirs 1. Low tension polymer flood using a polymer gradient in the three-phase region

Austad, Tor; Taugbøl, Knut

doi:10.1016/0927-7757(95)03231-2

Cited by 28 publications

(24 citation statements)

References 6 publications

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“…A large energy resource (over 300 billion barrels of crude oil) exists in domestic reservoirs if a technology can be developed to recover this entrapped oil (21). Capillary forces between the hydrocarbon and aqueous phases are largely responsible for trapping the hydrocarbons in the pores of the rock, and large reductions in the interfacial tension between the hydrocarbon and aqueous phases are needed for hydrocarbon mobilization (1,3,4,28,35). Microorganisms produce a variety of biosurfactants (6), several of which generate the ultra-low interfacial tensions needed for hydrocarbon mobilization (6,10,20).…”

Section: Bacillus Mojavensis Strains Jf-2 (Atcc 39307) Rob2 and Abomentioning

confidence: 99%

Anaerobic Growth of Bacillus mojavensis and Bacillus subtilis Requires Deoxyribonucleosides or DNA

Folmsbee

McInerney

Nagle

2004

Appl Environ Microbiol

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Bacillus mojavensis strains JF-2 (ATCC 39307), ROB2, and ABO21191T and Bacillus subtilis strains 168 (ATCC 23857) and ATCC 12332 required four deoxyribonucleosides or DNA for growth under strict anaerobic conditions. Bacillus licheniformis strains L89-11 and L87-11, Bacillus sonorensis strain TG8-8, and Bacillus cereus (ATCC 14579) did not require DNA for anaerobic growth. The requirement for the deoxyribonucleosides or DNA did not occur under aerobic growth conditions. The addition of a mixture of five nucleic acid bases, four ribonucleotides, or four ribonucleosides to the basal medium did not replace the requirement of B. mojavensis JF-2 for the four deoxyribonucleosides. However, the addition of salmon sperm DNA, herring sperm DNA, Escherichia coli DNA, or synthetic DNA (single or double stranded) to the basal medium supported anaerobic growth. The addition of four deoxyribonucleosides to the basal medium allowed aerobic growth of B. mojavensis JF-2 in the presence of hydroxyurea. B. mojavensis did not grow in DNA-supplemented basal medium that lacked sucrose as the energy source. These data provide strong evidence that externally supplied deoxyribonucleosides can be used to maintain a balanced deoxyribonucleotide pool for DNA synthesis and suggest that ribonucleotide reductases may not be essential to the bacterial cell cycle nor are they necessarily part of a minimal bacterial genome.Ribonucleotide reductases make deoxyribonucleotides from ribonucleotides regardless of whether the nucleotide is made de novo or by the salvage pathways (25,26,31). The de novo pathways make nucleotides from metabolic precursors generated in central metabolic pathways. The salvage pathways use exogenously supplied bases and nucleosides or recycle endogenously produced bases and nucleosides (23). Ribonucleotide reductases are considered essential to all organisms to regulate and maintain the deoxyribonucleotide pool necessary for DNA synthesis (9,18,25,29,32,33). Recently, the minimal essential genes of Bacillus subtilis were narrowed to only 192 "essential" genes out of 4,100 genes (19) and included the class I ribonucleotide reductase genes, nrdE and nrdF. In 1952, Lactobacillus acidophilus R-26 was reported to require at least one externally supplied deoxyribonucleoside and to lack ribonucleotide reductase activity (14). This finding suggests that ribonucleotide reductase activity may not be required for all microorganisms.In order to use deoxyribonucleosides as DNA precursors, an organism must be able to phosphorylate the deoxyribonucleoside to a deoxyribonucleotide. Escherichia coli and Salmonella enterica serovar Typhimurium do not have the deoxyribonucleoside kinases necessary for converting deoxyribonucleosides into deoxyribonucleotides and therefore cannot utilize exogenously supplied deoxyribonucleosides as sole DNA precursors (25). However, B. subtilis and lactobacilli have all of the kinases necessary to phosphorylate the deoxyribonucleosides to deoxyribonucleotides and could potentially use them as sole DNA precurs...

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Section: Bacillus Mojavensis Strains Jf-2 (Atcc 39307) Rob2 and Abomentioning

confidence: 99%

Anaerobic Growth of Bacillus mojavensis and Bacillus subtilis Requires Deoxyribonucleosides or DNA

Folmsbee

McInerney

Nagle

2004

Appl Environ Microbiol

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“…Entrapment of petroleum hydrocarbons by capillary forces is a major factor that limits oil recovery (1,3,4). Hydrocarbon displacement can occur if interfacial tension (IFT) between the hydrocarbon and aqueous phases is reduced by several orders of magnitude.…”

Section: Executive Summarymentioning

confidence: 99%

“…Entrapment of petroleum hydrocarbons by capillary forces is also a major factor that limits oil recovery (1,19,21). Current technology recovers only one-third to one-half of the oil that is originally present in an oil reservoir.…”

Section: Introductionmentioning

confidence: 99%

Development of Biosurfactant-Mediated Oil Recovery in Model Porous Systems and Computer Simulations of Biosurfactant-Mediated Oil Recovery

McInerney¹,

Maudgalya²,

Knapp³

et al. 2004

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Executive summaryCurrent technology recovers only one-third to one-half of the oil that is originally present in an oil reservoir. Entrapment of petroleum hydrocarbons by capillary forces is a major factor that limits oil recovery (1,3,4). Hydrocarbon displacement can occur if interfacial tension (IFT) between the hydrocarbon and aqueous phases is reduced by several orders of magnitude. Microbially-produced biosurfactants may be an economical method to recover residual hydrocarbons since they are effective at low concentrations.Previously, we showed that substantial mobilization of residual hydrocarbon from a model porous system occurs at biosurfactant concentrations made naturally by B. mojavensis strain JF-1 if a polymer and 2,3-butanediol were present (2). In this report, we include data on oil recovery from Berea sandstone experiments along with our previous data from sand pack columns in order to relate biosurfactant concentration to the fraction of oil recovered. We also investigate the effect that the JF-2 biosurfactant has on interfacial tension (IFT). The presence of a co-surfactant, 2,3-butanediol, was shown to 2.

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“…However, these multicomponent systems generally result in the 'chromatograph fractionating' effect when passing through porous media, impeding their applications in some specialized fields such as enhanced oil recovery process. 40 To overcome such a drawback, we further developed two onecomponent carbon dioxide-switchable wormlike micellar systems to simplify the formulation. The first one originates from 2 wt% aqueous solution of octadecyl dipropylene triamine (ODPTA).…”

Section: Introductionmentioning

confidence: 99%

CO₂-responsive anionic wormlike micelles based on natural erucic acid

2014

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Research interests highlighted in recent years a remarkable growing focus on stimuli-responsive surfactant wormlike micelles, particularly those using carbon dioxide as the trigger. In this article, we report a novel carbon dioxideresponsive wormlike micellar system based on natural erucic fatty acid and examined its solution properties through rheology, Fourier transform infrared spectroscopy and cryo-tranmission electron microscopy. When carbon dioxide is introduced into the erucic acid solution, high-viscelastic wormlike micelles shift to low-viscosity solutions in short-time scale, accompanied by decrease in pH from 11·34 to 8·90, which is accounted for the effect of pH on the existence form of erucic acid in aqueous solutions. Bubbling nitrogen under heating cannot make a converse process since the viscoelastic worms can only be obtained at a high pH. Compared with other carbon dioxide-responsive wormlike micelles, the current one is more readily obtained and more environment-friendly because it can be formed by simply changing pH value of the natural erucic acid solutions without needing complex organic synthesis or addition of hydrotropes. IntroductionStimuli-responsive materials whose properties respond remarkably on minor environmental change have attracted much attention in the last decade.1-3 Among all such materials, colloids and micelles represent important soft matters and play crucial roles in various industrial applications.2 Different micellar morphologies can be obtained by self-assembly of amphiphilic compounds such as surfactants or block copolymers. 4 One of such fascinating morphological aggregates is the wormlike or threadlike micelles. Above a critical overlapping concentration (C*), the wormlike micelles entangle into a dynamic 3D transient network reminiscent of polymer solutions to display remarkable macroscopic viscoelastic properties. However, unlike the polymer entanglements, they break and recombine in a dynamic process, and are thus called 'living' or 'equilibrium' polymers. 5,6 Because of their unique micellar structures and rheological response, 7,8 viscoelastic fluids based on wormlike micelles have been a key focus of research in soft matter from both theoreticians and experimentalists for fundamental studies as well as industry applications, including rheology control, 8

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Chemical flooding of oil reservoirs 1. Low tension polymer flood using a polymer gradient in the three-phase region

Cited by 28 publications

References 6 publications

Anaerobic Growth of Bacillus mojavensis and Bacillus subtilis Requires Deoxyribonucleosides or DNA

Anaerobic Growth of Bacillus mojavensis and Bacillus subtilis Requires Deoxyribonucleosides or DNA

Development of Biosurfactant-Mediated Oil Recovery in Model Porous Systems and Computer Simulations of Biosurfactant-Mediated Oil Recovery

CO₂-responsive anionic wormlike micelles based on natural erucic acid

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Chemical flooding of oil reservoirs 1. Low tension polymer flood using a polymer gradient in the three-phase region

Cited by 28 publications

References 6 publications

Anaerobic Growth of Bacillus mojavensis and Bacillus subtilis Requires Deoxyribonucleosides or DNA

Anaerobic Growth of Bacillus mojavensis and Bacillus subtilis Requires Deoxyribonucleosides or DNA

Development of Biosurfactant-Mediated Oil Recovery in Model Porous Systems and Computer Simulations of Biosurfactant-Mediated Oil Recovery

CO2-responsive anionic wormlike micelles based on natural erucic acid

Contact Info

Product

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About

CO₂-responsive anionic wormlike micelles based on natural erucic acid