Experimental investigation of emulsified oil dispersion on bulk foam stability

Roozbeh Rafati (Corresponding Author), Opeyemi Kehinde Oludara, Amin Sharifi Haddad, Hossein Hamidi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Recently aqueous foams have shown promising results to overcome viscous fingering and gravity segregation problems during gas injection process. However, one of the main challenges is the stability of the foams in the presence of oil bank at the front of injected foam. Oil can penetrate into the foam structure in the form of continuous phase or emulsions which might deteriorate lamellae and plateau borders that can result in bubble coalescence and foam rupture. The combination of the surfactant solution, responsible for stabilizing foams, with oil increases the potential for the formation of oil emulsions. In this condition emulsions stability and phase behaviour have the main influence on the bulk foam stability. The objective of this research is to conduct a comprehensive study on the effect of emulsified oil, at different concentrations and salinities on the stability of bulk foams used during oil displacement processes. This was achieved using a foam column test, in which foam is generated and its decay monitored with time. The half-life for each sample was noted and a comparison was made for different cases. Furthermore, changes in the foam bubble sizes and distribution were observed and analysed using an image processing software. A gradual reduction in the half-life of foam was observed with increasing concentration of emulsified oil. The degree to which a foam structure is destabilized by the emulsified oil droplets is dependent on the type and concentration of surfactant employed in generating the foam. At 2 wt% concentration of emulsion, the half-life recorded for foam generated by AOS surfactant, was 107 minutes, while for the foam generated by SDBS was only 39 minutes. Further analysis of the results showed a reduction in the number of dispersed oil droplets with increasing the salinity. In addition, the effect of increased salinity of the emulsion on foam stability was again found to be a function of the type of the surfactant is present in the foam system.
Original languageEnglish
Pages (from-to)110-121
Number of pages12
JournalColloids and Surfaces. A, Physicochemical and Engineering Aspects
Volume554
Early online date18 Jun 2018
DOIs
Publication statusPublished - 5 Oct 2018

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foams
Foams
Oils
oils
Emulsions
emulsions
Surface-Active Agents
Surface active agents
salinity
surfactants
half life
bubbles
gas injection
lamella
Phase behavior
Coalescence
borders
coalescing
image processing

Keywords

  • foam stability
  • emulsified oil
  • surfactant
  • foam texture
  • bubble size distribution

Cite this

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title = "Experimental investigation of emulsified oil dispersion on bulk foam stability",
abstract = "Recently aqueous foams have shown promising results to overcome viscous fingering and gravity segregation problems during gas injection process. However, one of the main challenges is the stability of the foams in the presence of oil bank at the front of injected foam. Oil can penetrate into the foam structure in the form of continuous phase or emulsions which might deteriorate lamellae and plateau borders that can result in bubble coalescence and foam rupture. The combination of the surfactant solution, responsible for stabilizing foams, with oil increases the potential for the formation of oil emulsions. In this condition emulsions stability and phase behaviour have the main influence on the bulk foam stability. The objective of this research is to conduct a comprehensive study on the effect of emulsified oil, at different concentrations and salinities on the stability of bulk foams used during oil displacement processes. This was achieved using a foam column test, in which foam is generated and its decay monitored with time. The half-life for each sample was noted and a comparison was made for different cases. Furthermore, changes in the foam bubble sizes and distribution were observed and analysed using an image processing software. A gradual reduction in the half-life of foam was observed with increasing concentration of emulsified oil. The degree to which a foam structure is destabilized by the emulsified oil droplets is dependent on the type and concentration of surfactant employed in generating the foam. At 2 wt{\%} concentration of emulsion, the half-life recorded for foam generated by AOS surfactant, was 107 minutes, while for the foam generated by SDBS was only 39 minutes. Further analysis of the results showed a reduction in the number of dispersed oil droplets with increasing the salinity. In addition, the effect of increased salinity of the emulsion on foam stability was again found to be a function of the type of the surfactant is present in the foam system.",
keywords = "foam stability, emulsified oil, surfactant, foam texture, bubble size distribution",
author = "Roozbeh Rafati and Oludara, {Opeyemi Kehinde} and {Sharifi Haddad}, Amin and Hossein Hamidi",
note = "The authors would like to thank the School of Engineering at the University of Aberdeen for providing materials and facilities to conduct this research.",
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doi = "10.1016/j.colsurfa.2018.06.043",
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T1 - Experimental investigation of emulsified oil dispersion on bulk foam stability

AU - Rafati, Roozbeh

AU - Oludara, Opeyemi Kehinde

AU - Sharifi Haddad, Amin

AU - Hamidi, Hossein

N1 - The authors would like to thank the School of Engineering at the University of Aberdeen for providing materials and facilities to conduct this research.

PY - 2018/10/5

Y1 - 2018/10/5

N2 - Recently aqueous foams have shown promising results to overcome viscous fingering and gravity segregation problems during gas injection process. However, one of the main challenges is the stability of the foams in the presence of oil bank at the front of injected foam. Oil can penetrate into the foam structure in the form of continuous phase or emulsions which might deteriorate lamellae and plateau borders that can result in bubble coalescence and foam rupture. The combination of the surfactant solution, responsible for stabilizing foams, with oil increases the potential for the formation of oil emulsions. In this condition emulsions stability and phase behaviour have the main influence on the bulk foam stability. The objective of this research is to conduct a comprehensive study on the effect of emulsified oil, at different concentrations and salinities on the stability of bulk foams used during oil displacement processes. This was achieved using a foam column test, in which foam is generated and its decay monitored with time. The half-life for each sample was noted and a comparison was made for different cases. Furthermore, changes in the foam bubble sizes and distribution were observed and analysed using an image processing software. A gradual reduction in the half-life of foam was observed with increasing concentration of emulsified oil. The degree to which a foam structure is destabilized by the emulsified oil droplets is dependent on the type and concentration of surfactant employed in generating the foam. At 2 wt% concentration of emulsion, the half-life recorded for foam generated by AOS surfactant, was 107 minutes, while for the foam generated by SDBS was only 39 minutes. Further analysis of the results showed a reduction in the number of dispersed oil droplets with increasing the salinity. In addition, the effect of increased salinity of the emulsion on foam stability was again found to be a function of the type of the surfactant is present in the foam system.

AB - Recently aqueous foams have shown promising results to overcome viscous fingering and gravity segregation problems during gas injection process. However, one of the main challenges is the stability of the foams in the presence of oil bank at the front of injected foam. Oil can penetrate into the foam structure in the form of continuous phase or emulsions which might deteriorate lamellae and plateau borders that can result in bubble coalescence and foam rupture. The combination of the surfactant solution, responsible for stabilizing foams, with oil increases the potential for the formation of oil emulsions. In this condition emulsions stability and phase behaviour have the main influence on the bulk foam stability. The objective of this research is to conduct a comprehensive study on the effect of emulsified oil, at different concentrations and salinities on the stability of bulk foams used during oil displacement processes. This was achieved using a foam column test, in which foam is generated and its decay monitored with time. The half-life for each sample was noted and a comparison was made for different cases. Furthermore, changes in the foam bubble sizes and distribution were observed and analysed using an image processing software. A gradual reduction in the half-life of foam was observed with increasing concentration of emulsified oil. The degree to which a foam structure is destabilized by the emulsified oil droplets is dependent on the type and concentration of surfactant employed in generating the foam. At 2 wt% concentration of emulsion, the half-life recorded for foam generated by AOS surfactant, was 107 minutes, while for the foam generated by SDBS was only 39 minutes. Further analysis of the results showed a reduction in the number of dispersed oil droplets with increasing the salinity. In addition, the effect of increased salinity of the emulsion on foam stability was again found to be a function of the type of the surfactant is present in the foam system.

KW - foam stability

KW - emulsified oil

KW - surfactant

KW - foam texture

KW - bubble size distribution

U2 - 10.1016/j.colsurfa.2018.06.043

DO - 10.1016/j.colsurfa.2018.06.043

M3 - Article

VL - 554

SP - 110

EP - 121

JO - Colloids and Surfaces. A, Physicochemical and Engineering Aspects

JF - Colloids and Surfaces. A, Physicochemical and Engineering Aspects

SN - 0927-7757

ER -