Rheology of highly paraffinaceous crude oil

Matveenko, V. N.; Kirsanov, Evgeny A.; Remizov, S. V.

doi:10.1016/0927-7757(95)03171-9

Cited by 15 publications

(9 citation statements)

References 3 publications

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“…Several researchers have investigated models to describe the rheological properties of waxy oils (Davenport and Somper, 1971;Matveenko et al, 1995;Remizov et al, 2000).…”

Section: Yield Stress Of Wax-oil Gelsmentioning

confidence: 98%

The strength of paraffin gels formed under static and flow conditions

Venkatesan

Nagarajan

Paso

et al. 2005

Chemical Engineering Science

267

292

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“…Several researchers have investigated models to describe the rheological properties of waxy oils (Davenport and Somper, 1971;Matveenko et al, 1995;Remizov et al, 2000).…”

Section: Yield Stress Of Wax-oil Gelsmentioning

confidence: 98%

The strength of paraffin gels formed under static and flow conditions

Venkatesan

Nagarajan

Paso

et al. 2005

Chemical Engineering Science

267

292

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“…In addition, the common plastic flow models that reasonably identify the non-Newtonian rheological flow behavior of paraffinic crudes at temperatures around and lower than the pour point are [13][14][15][16][17]: where: k 1 Casson yield parameter k 2 Casson viscosity parameter and…”

Section: Introductionmentioning

confidence: 99%

Low temperature rheological behavior of Umbarka waxy crude and influence of flow improver

El‐Gamal¹,

Gad²

1998

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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LOW TEMPERATURE RHEOLOGICAL BEHAVIOR OF UMBARKA WAXY CRUDE AND INFLUENCE OF FLOW IMPROVERThe low temperature flow properties; pour point and rheological parameters; have been determined for untreated and additive treated Umbarka waxy crude. The rheological characteristics of the crude showed non-Newtonian yield pseudoplastic flow behavior and pronounced thixotropic effect. Viscometric data are fitted to Bingham, Casson and Herschel-Bulkley plastic flow models using linear and non-linear computer regression analysis. Herschel parameters showed inconsistent results whereas Casson equation fitted the data reasonably well. Treatment of the crude with flow improver ameliorated both rheological properties and pour point but in a different manner. The influence of the additive on the rheology of the crude is greatly affected by shear rate. The thixotropic phenomenon of the crude is likely to be temperaturedependent in addition to the other controlling factors. El objeto de este estudio consiste en determinar las características del crudo parafínico de Umbarka, con o sin aditivos para la mejora de la fluencia, así como los datos reológicos. Las características reológicas del crudo presentan un comportamiento de fluencia seudoplástica, con un límite elástico no newtoniano, así como un efecto tixotrópico acusado. Se ha establecido una correlación entre los datos viscométricos y los modelos de fluencia plástica de Bingham, Casson y Herschel-Bulkley, utilizando para ello un análisis de regresión informática lineal y no lineal. Si bien los parámetros de Herschel dan lugar a resultados incoherentes, en cambio, la ecuación de Casson permite establecer una correlación razonablemente satisfactoria de los datos. El tratamiento del crudo por medio de un aditivo de mejora de la fluencia tiene repercusiones positivas, aun cuando diferentes, acerca de las propiedades reológicas y el punto de fluidez. Los efectos del aditivo sobre la reología del crudo dependen ampliamente de la relación del esfuerzo cortante y es probable que el fenómeno tixotrópico dependa de la temperatura, además de los otros factores determinantes.

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“…Vinogradov et al (1982) studied the thixotropic and viscoelastic characteristics of highlyparaffinic crude oils at different shear deformations. The time-dependent thixotropic behaviour of highly paraffinic crude oil was also studied by Matveenko et al (1995), who found them to be pseudoplastic with pronounced thixotropy.…”

Section: Time Dependencymentioning

confidence: 99%

“…Several researchers have investigated models to describe the rheological properties of waxy oils (Davenport and Somper, 1971;Matveenko et a!., 1995;Remizov eta!., 2000), namely the Casson ( 1959) model. This model describes the stress-strain relationship of a non-Newtonian fluid as:…”

Section: Modelling Crude Oil Emulsionsmentioning

confidence: 99%

Flow behaviour of water-in-oil emulsions stabilized by wax crystals

Aafaqi¹

2021

Preprint

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The large temperature gradients experienced by crude oil emulsions in pipelines found in colder environments can lead to the precipitation, deposition and build-up of wax-like species from the crude oil onto the pipe wall that result in flow assurance problems. The objective of this thesis was to understand the rheological behaviour of model water-in-oil emulsions stabilized by wax crystals. The microstructure, phase transitions and rheology of model emulsions constisting of water, mineral oil, parrafin wax and the emulsifier polyglycerol polyricinoleate (PgPr) were investigated. Changes in emulsion flow begaviour (steady state and dynamic) as a function of composition, termperature and passage through a laboratory-scale flowloop were investigated, with these parameters significantly affecting shear flow, yield stress and viscoelasticity. The gelation temperature of wax-containing ('waxy') oil was slightly lower than that of its equivalent emulsion due to differences in the structure of the gelled emulsion network. Overall, this study successfully showed that there exist significant differences in the microstructure and flow behaviour of model crude oil emulsions when wax and a dispersed aqueous phase are present.

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Rheology of highly paraffinaceous crude oil

Cited by 15 publications

References 3 publications

The strength of paraffin gels formed under static and flow conditions

The strength of paraffin gels formed under static and flow conditions

Low temperature rheological behavior of Umbarka waxy crude and influence of flow improver

Flow behaviour of water-in-oil emulsions stabilized by wax crystals

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