Chemically Induced Destabilization of Water-in-Crude Oil Emulsions

Pena, Alejandro Andres; Hirasaki, George J.; Miller, Clarence A.

doi:10.1021/ie049666i

Cited by 131 publications

(61 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…5,16,17 These chemical compounds have nonionic character, with relatively high molar mass (normally above 3,000 Da) and have one part that is hydrophilic and another hydrophobic. 18 The hydrophilic part includes the oxyethylene, hydroxyl, carboxyl or amine groups, while the hydrophobic parts are composed of alkyl, alkylphenol or oxypropylene groups. 19,20 Among the commercial demulsifiers are ethoxylated phenol-formaldehyde resins and poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) block copolymers.…”

Section: Introductionmentioning

confidence: 99%

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

Honse¹,

Mansur²,

Lucas³

2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

O petróleo é produzido na forma de emulsão água em óleo e os asfaltenos são considerados os principais responsáveis pela estabilização dessas emulsões. O objetivo deste trabalho foi avaliar a influência de diferentes frações asfaltênicas sobre a estabilidade de emulsões modelo de petróleo (salmoura em asfaltenos/tolueno) e sobre a eficiência de desemulsificantes. A estabilidade das emulsões foi acompanhada pelo ensaio de garrafa, com e sem a adição de desemulsificante. Os resultados mostram que a amostra de asfaltenos com larga distribuição de polaridade promove maior estabilidade da emulsão do que a amostra com distribuição mais estreita e polaridade intermediária. Além disso, a eficiência do desemulsificante na separação das emulsões está diretamente relacionada à estabilidade original da emulsão. Resultados de tensão interfacial evidenciaram a eficiência de deslocamento dos asfaltenos pelos tensoativos desemulsificantes, o que ocorreu com maior eficiência para as emulsões contendo frações de asfaltenos com distribuição estreita e polaridade intermediária.Crude oil is produced as water-in-oil emulsion, and asphaltenes have been considered the main responsible by their stabilization. The aim of this work was to evaluate the influence of the asphaltenes subfractions on the stability of petroleum model emulsions and on the efficiency of demulsifiers. Model water-in-oil emulsions were prepared: aqueous phase of brine and oil phase of asphaltenes in toluene. Different asphaltenes fractions were used. The emulsions' stability was assessed by the bottle test, with and without adding demulsifier. The results show that a sample of asphaltenes with broad polarity distribution promotes greater emulsion stability than a sample with narrow distribution and intermediate polarity. Besides this, the efficiency of demulsifiers in separating the emulsions is directly related to the original stability of the emulsion. Measurements of the interfacial tension revealed the efficiency of displacement of the asphaltenes by the demulsifiers, which occurred more efficiently for the emulsions containing asphaltenes fractions with narrow distribution and intermediate polarity.

show abstract

Section: Introductionmentioning

confidence: 99%

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

Honse¹,

Mansur²,

Lucas³

2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…In comparison to works carried out by other researchers Temple-Heald et al (2015), Al-Sabagh et al (2009) and Pena et al (2005), where base catalysed ethoxylated phenolic resins were mostly investigated, the phenolic resins promoted coalescence of droplets (water separation) giving optimum performance as the resins' hydrophilic property (or water solubility), concentration, temperature and molecular weight (mole ratios) were increased.…”

Section: Interaction Effects Plot (Analysis Of Novolaks De-emulsifiermentioning

confidence: 89%

Optimization of Phenolic Based De-Emulsifiers

Efeovbokha¹,

Olayemi²,

Anawe³

et al. 2015

J. of Applied Sciences

View full text Add to dashboard Cite

A B S T R A C TThe de-emulsification of a Nigerian crude oil emulsion has been investigated using locally formulated base and acid catalyzed phenol formaldehyde resins with varied formaldehyde to phenol molar ratios. The bottle test method was used for the screening process and the best de-emulsifier was chosen based on the largest volume of water removed from the crude oil emulsion. The screening process was done at temperatures of 50 and 70°C and de-emulsifier concentrations of 20 and 50 part per million (ppm), respectively. A factorial design was done to determine the best combination of de-emulsification conditions for optimal performance. The results were optimized and analyzed using software called Minitab 16 utilizing pareto chart, normal effects, main effects and interactions plots. From the analysis, it was found that the optimum set of conditions for best performance of the resole de-emulsifier were 50 ppm, 70°C and 1.8:1 concentration, screening temperature and formaldehyde to phenol molar ratio, respectively. While for novolak de-emulsifiers, they were 50 ppm, 70°C and 0.1:1. Increasing temperature and concentrations were found to enhance de-emulsification performance with all the resole and novolak de-emulsifiers.

show abstract

“…Poindexter et al (2005) of Nalco Chemical Co. used emulsion bottle tests to correlate crude-oil emulsion stability to asphaltene, solids, resins, and wax content in the crude oil. Pena et al (2005) of Rice University used emulsion bottle tests to examine the efficacy of commercial emulsion-breaking compounds on crude-oil emulsions. Thompson et al (1985) of BP used emulsion bottle tests to examine at the effect of waxes on crude-oil emulsion stability.…”

Section: Use Of Bottle Testsmentioning

confidence: 99%

Brine-in-crude-oil emulsions at the Strategic Petroleum Reserve

Nemer

Lord

MacDonald

2013

View full text Add to dashboard Cite

Metastable water-in-crude-oil emulsion formation could occur in a Strategic Petroleum Reserve (SPR) cavern if water were to flow into the crude-oil layer at a sufficient rate. Such a situation could arise during a drawdown from a cavern with a broken-hanging brine string. A high asphaltene content (> 1.5 wt %) of the crude oil provides the strongest predictor of whether a metastable water-in-crude-oil emulsion will form. However there are many crude oils with an asphaltene content > 1.5 wt % that don't form stable emulsions, but few with a low asphaltene content that do form stable emulsions. Most of the oils that form stable emulsions are "sour" by SPR standards indicating they contain total sulfur > 0.50 wt %. 4 ACKNOWLEDGMENTSThanks to Patrick V. Brady for performing a review of this work. Thanks to Collins Lanier, Lisa, Eldredge, and Pat Milhalik for their support of this work over the years.5

show abstract

Chemically Induced Destabilization of Water-in-Crude Oil Emulsions

Cited by 131 publications

References 25 publications

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

Optimization of Phenolic Based De-Emulsifiers

Brine-in-crude-oil emulsions at the Strategic Petroleum Reserve

Contact Info

Product

Resources

About