The Colloidal Approach. A Promising Route for Asphaltene Deposition Modelling

Nabzar, L.; Aguilera, María Eugenia

doi:10.2516/ogst:2007083

Cited by 72 publications

(67 citation statements)

References 19 publications

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“…11,14,15 In some cases, this effect has been referred to as "shear-limited deposition." 17 compare runs at different Q with each other, we plot only the excess pressure drop due to deposition ∆P + = ∆P − ∆P 0 , as shown in Fig. 5(b).…”

Section: A Experimental Resultsmentioning

confidence: 99%

“…(10) predicts a rise in ∆P that begins smoothly and immediately, contrary to suggestions of a "deposition detection time" or "induction period." 16,17 The complete clogging of the pipe generates a singularity in the flow, a complete obstruction, when R → 0. Clogging will always occur eventually, when Bkφτ Pe 2/3 → 1.…”

Section: B Analysismentioning

confidence: 99%

“…15 In straight metal capillary studies, pressure drop is monitored as an indication of the constriction of the conduit. 16,17 One study using a fixed flow rate and changing ratios of heptane to two different petroleum fluids concluded that the amount of precipitating material is a strong contributor to the deposition behavior: when too little heptane was added to the petroleum fluid, very little deposition occurred; while the largest amount of heptane used, 50% by volume, generated the most deposition. 16 In larger metal pipes (24 mm diameter), decreasing flow rate and increasing asphaltene content were both found to increase deposition, but the control parameters were varied only by a factor of two.…”

Section: Introductionmentioning

confidence: 99%

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Colloidal asphaltene deposition in laminar pipe flow: Flow rate and parametric effects

2015

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Deposition from a suspended phase onto a surface can aversely affect everyday transport processes on a variety of scales, from mineral scale corrosion of household plumbing systems to asphaltene deposition in large-scale pipelines in the petroleum industry. While petroleum may be a single fluid phase under reservoir conditions, depressurization upon production often induces a phase transition in the fluid, resulting in the precipitation of asphaltene material which readily aggregates to the colloidal scale and deposits on metallic surfaces. Colloidal asphaltene deposition in wellbores and pipelines can be especially problematic for industrial purposes, where cleanup processes necessitate costly operational shutdowns. In order to better understand the parametric dependence of deposition which leads to flow blockages, we carry out lab-scale experiments under a variety of material and flow conditions. We develop a parametric scaling model to understand the fluid dynamics and transport considerations governing deposition. The lab-scale experiments are performed by injecting precipitating petroleum fluid mixtures into a small metal pipe, which results in deposition and clogging, assessed by measuring the pressure drop across the pipe. Parametric scaling arguments suggest that the clogging behavior is determined by a combination of the Peclet number, volume fraction of depositing material, and the volume of the injection itself. C 2015 AIP Publishing LLC.

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Section: A Experimental Resultsmentioning

confidence: 99%

Section: B Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Colloidal asphaltene deposition in laminar pipe flow: Flow rate and parametric effects

2015

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“…Heavy oils are also at the origin of the plugging problem via deposition in porous media during production [5] and are thought to affect stability of gas hydrate particles in oil production pipelines, thus preventing the formation of solid plugs which would result in the blockage of the lines [6].…”

Section: Introductionmentioning

confidence: 99%

Relation between Nanoscale Structure of Asphaltene Aggregates and their Macroscopic Solution Properties

Barré

Jestin

Morisset

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Relation entre nanostructure des agrégats d'asphaltène et les propriétés macroscopiques de leur solution -Certaines propriétés particulières de bruts pétroliers sont attribuées à leur fraction la plus dense, lourde et polaire : les asphaltènes. La compréhension de l'origine de ces propriétés repose sur une description structurale fine de ces fractions. Nous présentons une caractérisation des solutions d'asphaltène, à l'échelle du nanomètre, basée sur de nouvelles ou récentes expériences de diffusion de rayonnement (rayons X ou neutrons) à partir desquelles des paramètres structuraux des agrégats d'asphaltène (R g , M w et A 2 ) sont déduits. La dépendance de ces paramètres est compatible avec un modèle d'agrégats de type fractal de masse. Ce modèle rend compte de toute la variété de propriétés macroscopiques de ces solutions. En particulier, la prise en compte de l'aspect solvaté des agrégats permet de prédire la viscosité de solutions d'asphaltène en fonction de leur concentration. D'autre part, les asphaltènes s'adsorbent aux interfaces liquide-liquide et liquide-solide et forment des monocouches dont l'épaisseur est du même ordre de grandeur que la taille des agrégats de la solution. L'analyse des isothermes d'adsorption, les expériences de réflectivité des neutrons ainsi que les expériences de diffusion des neutrons en conditions d'extinction de contraste, mettent en évidence une densification des agrégats d'asphaltène dans la couche adsorbée relativement à leur état solvaté dans le volume. Enfin, la résultante des interactions attractives/répulsives entre agrégats peut être reliée à la stabilité relative d'émulsions d'eau dans l'huile et à la stabilité d'effluents d'hydroconversion. Cette approche de mise en relation entre structure et propriété permet d'asseoir et de justifier le modèle de fractal de masse qui est discuté. Abstract

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“…The literature review of experimental work on asphaltene deposition along the pipelines can be categorized into two geometries: tubes of capillary (Broseta et al, 2000;Nabzar and Aguiléra 2008;Boek et al, 2009) or larger dimensions (Jamialahmadi et al, 2009) and Taylor-Couette (TC) cells (Zougari et al, 2006;Akbarzadeh et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Investigation of the asphaltene deposition along the flow of the oil in tubing: Experimental study and a parametric analysis

Ghahfarokhi

Kharrat

Soulgani

2016

Petroleum Science and Technology

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In this work, a novel experimental setup was designed and utilized to carry out the n-alkane induced asphaltenes for understanding the kinetics of deposition and also effects of oil velocity, oil-precipitant volumetric dilution ratio, and temperature on the rate of asphaltene deposition. As the deposited layer of asphaltenes makes it difficult for the flow of oil along the tube, measurement of the pressure drop across the tube section of setup enabled the measurement of the amount and extent of deposition process at desired condition. The experimental results revealed that increasing the velocity of fluid across the pipe dominance the shear force on asphaltene deposit and cause remobilization of part of the deposit into the flowing fluid in contrary to oil-precipitant ratio, where deposition rate is enhanced with increasing DR ratio. The results of this work elucidate some less-addressed shadows of dynamics of flow blockage in pipelines and could create a better framework for conducting forthcoming experiments

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The Colloidal Approach. A Promising Route for Asphaltene Deposition Modelling

Cited by 72 publications

References 19 publications

Colloidal asphaltene deposition in laminar pipe flow: Flow rate and parametric effects

Colloidal asphaltene deposition in laminar pipe flow: Flow rate and parametric effects

Relation between Nanoscale Structure of Asphaltene Aggregates and their Macroscopic Solution Properties

Investigation of the asphaltene deposition along the flow of the oil in tubing: Experimental study and a parametric analysis

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