Advances in asphaltene science and the Yen-Mullins model

Oliver C. Mullins, Hassan Sabbah, Joëlle Eyssautier, Andrew E. Pomerantz, Loïc Barré, A. Ballard Andrews, Yosadara Ruiz-Morales, Farshid Mostowfi, Richard McFarlane, Lamia Goual, Richard Lepkowicz, Thomas Cooper, Jhony Orbulescu, Roger Leblanc, John Edwards, Richard N. Zare

Research output: Contribution to journalArticle

443 Citations (Scopus)

Abstract

The Yen-Mullins model, also known as the modified Yen model, specifies the predominant molecular and colloidal structure of asphaltenes in crude oils and laboratory solvents and consists of the following: The most probable asphaltene molecular weight is ∼750 g/mol, with the island molecular architecture dominant. At sufficient concentration, asphaltene molecules form nanoaggregates with an aggregation number less than 10. At higher concentrations, nanoaggregates form clusters again with small aggregation numbers. The Yen-Mullins model is consistent with numerous molecular and colloidal studies employing a broad array of methodologies. Moreover, the Yen-Mullins model provides a foundation for the development of the first asphaltene equation of state for predicting asphaltene gradients in oil reservoirs, the Flory-Huggins-Zuo equation of state (FHZ EoS). In turn, the FHZ EoS has proven applicability in oil reservoirs containing condensates, black oils, and heavy oils. While the development of the Yen-Mullins model was founded on a very large number of studies, it nevertheless remains essential to validate consistency of this model with important new data streams in asphaltene science. In this paper, we review recent advances in asphaltene science that address all critical aspects of the Yen-Mullins model, especially molecular architecture and characteristics of asphaltene nanoaggregates and clusters. Important new studies are shown to be consistent with the Yen-Mullins model. Wide ranging studies with direct interrogation of the Yen-Mullins model include detailed molecular decomposition analyses, optical measurements coupled with molecular orbital calculations, nuclear magnetic resonance (NMR) spectroscopy, centrifugation, direct-current (DC) conductivity, interfacial studies, small-angle neutron scattering (SANS), and small-angle X-ray scattering (SAXS), as well as oilfield studies. In all cases, the Yen-Mullins model is proven to be at least consistent if not valid. In addition, several studies previously viewed as potentially inconsistent with the Yen-Mullins model are now largely resolved. Moreover, oilfield studies using the Yen-Mullins model in the FHZ EoS are greatly improving the understanding of many reservoir concerns, such as reservoir connectivity, heavy oil gradients, tar mat formation, and disequilibrium. The simple yet powerful advances codified in the Yen-Mullins model especially with the FHZ EoS provide a framework for future studies in asphaltene science, petroleum science, and reservoir studies.

Original languageEnglish
Pages (from-to)3986-4003
Number of pages18
JournalEnergy and Fuels
Volume26
Issue number7
DOIs
StatePublished - Jul 19 2012

Fingerprint

Equations of state
Petroleum reservoirs
Crude oil
Oils
Petroleum
asphaltene
Agglomeration
Tars
Orbital calculations
Asphaltenes
Centrifugation
Tar
Molecular orbitals
Neutron scattering
X ray scattering
Nuclear magnetic resonance spectroscopy
Molecular weight
Decomposition
Molecules

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Mullins, O. C., Sabbah, H., Eyssautier, J., Pomerantz, A. E., Barré, L., Andrews, A. B., ... Zare, R. N. (2012). Advances in asphaltene science and the Yen-Mullins model. Energy and Fuels, 26(7), 3986-4003. https://doi.org/10.1021/ef300185p

Advances in asphaltene science and the Yen-Mullins model. / Mullins, Oliver C.; Sabbah, Hassan; Eyssautier, Joëlle; Pomerantz, Andrew E.; Barré, Loïc; Andrews, A. Ballard; Ruiz-Morales, Yosadara; Mostowfi, Farshid; McFarlane, Richard; Goual, Lamia; Lepkowicz, Richard; Cooper, Thomas; Orbulescu, Jhony; Leblanc, Roger; Edwards, John; Zare, Richard N.

In: Energy and Fuels, Vol. 26, No. 7, 19.07.2012, p. 3986-4003.

Research output: Contribution to journalArticle

Mullins, OC, Sabbah, H, Eyssautier, J, Pomerantz, AE, Barré, L, Andrews, AB, Ruiz-Morales, Y, Mostowfi, F, McFarlane, R, Goual, L, Lepkowicz, R, Cooper, T, Orbulescu, J, Leblanc, R, Edwards, J & Zare, RN 2012, 'Advances in asphaltene science and the Yen-Mullins model', Energy and Fuels, vol. 26, no. 7, pp. 3986-4003. https://doi.org/10.1021/ef300185p
Mullins OC, Sabbah H, Eyssautier J, Pomerantz AE, Barré L, Andrews AB et al. Advances in asphaltene science and the Yen-Mullins model. Energy and Fuels. 2012 Jul 19;26(7):3986-4003. https://doi.org/10.1021/ef300185p
Mullins, Oliver C. ; Sabbah, Hassan ; Eyssautier, Joëlle ; Pomerantz, Andrew E. ; Barré, Loïc ; Andrews, A. Ballard ; Ruiz-Morales, Yosadara ; Mostowfi, Farshid ; McFarlane, Richard ; Goual, Lamia ; Lepkowicz, Richard ; Cooper, Thomas ; Orbulescu, Jhony ; Leblanc, Roger ; Edwards, John ; Zare, Richard N. / Advances in asphaltene science and the Yen-Mullins model. In: Energy and Fuels. 2012 ; Vol. 26, No. 7. pp. 3986-4003.
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AU - Mullins, Oliver C.

AU - Sabbah, Hassan

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AU - Barré, Loïc

AU - Andrews, A. Ballard

AU - Ruiz-Morales, Yosadara

AU - Mostowfi, Farshid

AU - McFarlane, Richard

AU - Goual, Lamia

AU - Lepkowicz, Richard

AU - Cooper, Thomas

AU - Orbulescu, Jhony

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N2 - The Yen-Mullins model, also known as the modified Yen model, specifies the predominant molecular and colloidal structure of asphaltenes in crude oils and laboratory solvents and consists of the following: The most probable asphaltene molecular weight is ∼750 g/mol, with the island molecular architecture dominant. At sufficient concentration, asphaltene molecules form nanoaggregates with an aggregation number less than 10. At higher concentrations, nanoaggregates form clusters again with small aggregation numbers. The Yen-Mullins model is consistent with numerous molecular and colloidal studies employing a broad array of methodologies. Moreover, the Yen-Mullins model provides a foundation for the development of the first asphaltene equation of state for predicting asphaltene gradients in oil reservoirs, the Flory-Huggins-Zuo equation of state (FHZ EoS). In turn, the FHZ EoS has proven applicability in oil reservoirs containing condensates, black oils, and heavy oils. While the development of the Yen-Mullins model was founded on a very large number of studies, it nevertheless remains essential to validate consistency of this model with important new data streams in asphaltene science. In this paper, we review recent advances in asphaltene science that address all critical aspects of the Yen-Mullins model, especially molecular architecture and characteristics of asphaltene nanoaggregates and clusters. Important new studies are shown to be consistent with the Yen-Mullins model. Wide ranging studies with direct interrogation of the Yen-Mullins model include detailed molecular decomposition analyses, optical measurements coupled with molecular orbital calculations, nuclear magnetic resonance (NMR) spectroscopy, centrifugation, direct-current (DC) conductivity, interfacial studies, small-angle neutron scattering (SANS), and small-angle X-ray scattering (SAXS), as well as oilfield studies. In all cases, the Yen-Mullins model is proven to be at least consistent if not valid. In addition, several studies previously viewed as potentially inconsistent with the Yen-Mullins model are now largely resolved. Moreover, oilfield studies using the Yen-Mullins model in the FHZ EoS are greatly improving the understanding of many reservoir concerns, such as reservoir connectivity, heavy oil gradients, tar mat formation, and disequilibrium. The simple yet powerful advances codified in the Yen-Mullins model especially with the FHZ EoS provide a framework for future studies in asphaltene science, petroleum science, and reservoir studies.

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