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Título : | Interfacial rheological studies of extra-heavy crude oils and asphaltenes: role of the dispersion effect of resins in the adsorption of asphaltenes at the interface of water-in-crude oil emulsionsa |
Autor : | Acevedo, Sócrates Escobar, Gastón Gutiérrez, Luis Rivas, Hercilio Gutiérrez, Xiomara |
Palabras clave : | Adsorption; asphaltenes; crude oil emulsions; dispersion; rheology. |
Fecha de publicación : | 21-Jul-2015 |
Resumen : | The interfacial behaviour of a crude oil and an asphaltene system has been studied by a planar rheological method.
System S, was a 30% (v/v) xylene dilution of extra-heavy Cerro Negro crude oil; the aqueous phase was tridistilled water
or an NaCl solution (2% (w/v)). System S2 was a 3.21% (w/v) dilution of Cerro Negro asphaltene in xylene; aqueous phase
as for system S,. These systems were studied under creep in the pH range 1.6-9.5. The elasticity (E, and E,) and viscosity
(ttr and qN) surface moduli were obtained from creep compliance measurements. Viscoelastic as well as elastic behaviour
was observed. The interfacial rheological behaviour of asphaltene and crude oil systems was found to be very different in
the presence and absence of salt. The high values of the moduli, leading to the high stability of water-in-oil emulsions,
was attributed to flocculation of asphaltene-resin micelles at the interface. In the absence of resins, asphaltenes were not
dispersed and their adsorption at the interface could lead to precipitation and multilayer formation. |
URI : | http://hdl.handle.net/10872/11557 |
ISSN : | 0927-7757 |
Aparece en las colecciones: | Artículos Publicados
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