The Effect of Solvent Nature and Dispersant Performance on Asphaltene Precipitation from Diluted Solutions of Instable Crude Oil

Pereira, Juan Carlos; Delgado-Linares, José G.; Briones, A.; Guevara, Mairis; Scorzza, César; Salager, Jean-Louis

doi:10.1080/10916461003735061

Cited by 26 publications

(18 citation statements)

References 21 publications

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“…22 The effectiveness of dispersants is typically characterized by quantifying the concentration of suspended asphaltenes in the solution using turbidity measurements and dispersancy tests by transmittance under static conditions. 16,17,[22][23][24][25][26][27] However, the performance of dispersants under complex flow conditions is difficult to predict solely from static dispersancy tests. Without considering hydrodynamic effects on asphaltene aggregates, these chemical dispersants may worsen deposition and hasten flow assurance problems in the field.…”

Section: Introductionmentioning

confidence: 99%

Characterizing Asphaltene Deposition in the Presence of Chemical Dispersants in Porous Media Micromodels

Lin

Tavakkoli

et al. 2017

Energy Fuels

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Asphaltenes are components in crude oil known to deposit and interrupt flows in critical regions during oil production, such as the wellbore and transportation pipelines. Chemical dispersants are commonly used to disperse asphaltenes into smaller agglomerates or increase asphaltene stability in solution with the goal of preventing deposition. However, in many cases, these chemical dispersants fail in the field or even worsen the deposition problems in the wellbores. Further understanding of the mechanisms by which dispersants alter asphaltene deposition under dynamic flowing conditions are needed to better understand flow assurance problems. Here, we describe the use of porous media microfluidic devices to evaluate how chemical dispersants change asphaltene deposition. Four commercially used alkyl-phenol model chemical dispersants are tested with model oils flowing through porous media, and the resulting deposition kinetics are visualized at both the matrix-scale and the pore-scale. Interestingly, initial asphaltene deposition worsens in the presence of the tested dispersants, but the mechanism by which plugging and permeability reduction in the porous media varies. The velocity profiles near the deposit are analyzed to further investigate how shear forces affect asphaltene deposition. The deposition tendency is also related to the intermolecular interactions governing the asphaltene-dispersant systems. Furthermore, the model system is extended to a real case. The use of porous media microfluidic devices offers a unique

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Section: Introductionmentioning

confidence: 99%

Characterizing Asphaltene Deposition in the Presence of Chemical Dispersants in Porous Media Micromodels

Lin

Tavakkoli

et al. 2017

Energy Fuels

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“…The inhibitor is used to control asphaltene precipitation by adsorption at the surface of asphaltene molecules and to keep asphaltene particles stable against precipitation [10,9]. Asphaltene solution with Heptol (30:70 vol.…”

Section: Asphaltene Stabilitymentioning

confidence: 99%

A novel inhibitor for controlling Iraqi asphaltene problems

Alhreez

Wen

Ali

2017

2017 International Conference on Environmental Impacts of the Oil and Gas Industries: Kurdistan Region of Iraq as a Case Study

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“…There was no change of percent transmitance (>8%) within 30 days of analysis. No phenomena of measurable migration (separation, locculation, coalescence, or sedimentation) were observed [36,40]. To conirm the results yielded by the Turbiscan instrument, the migration speed of the agglomerates of HC1 was determined to be 3.69 × 10 −6 mm min −1 and for HC2 of 8.683 × 10 −7 mm min −1 ( Table 3).…”

Section: Analysis Of Migration Phenomenon In Heavy Crude Oilmentioning

confidence: 99%

“…The aggregate size instability of asphaltenic solutions is a result of the absence of resins, which are known to favor stability [1,37]. Therefore, the average aggregate size was no longer uniform, and unlike the behavior observed in unfractionated crude oil, the values corresponding to asphaltene solutions did not it any tendency [1,[25][26][27][28][29][30][31][32][33][34][35][36][37][38]. Two types of asphaltenes extracted from crude oil of diferent sources and SARA compositions were studied, by using SEM and HTEM.…”

Section: Recent Insights In Petroleum Science and Engineeringmentioning

confidence: 99%

Characterization of Crude Oils and the Precipitated Asphaltenes Fraction using UV Spectroscopy, Dynamic Light Scattering and Microscopy

Cruz¹,

Rivas²,

García³

et al. 2018

Recent Insights in Petroleum Science and Engineering

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Analysis of crude oil composition provides important information that impacts on the recovery, handling, and transportation of hydrocarbons. Crude characterization also provides data in the analysis of geochemistry of the source of origin. Crude oil characterization by optical methods is usually diicult because of its dark color; however, those characterizations are crucial because they give information that can afect some analysis procedures. Ultraviolet-visible (UV-vis) spectroscopy is a simple and practical technique that allows the characterization of crude oil through dilution in solvents. A comparative study of crude oil solutions contrasted with their asphaltene fractions was performed. Each solution was analyzed in triplicate, on a UV-vis spectrophotometer. Calibration curves for both raw solutions showed no signiicant variations, indicating stability. Additionally, the results of dispersion and migration phenomena indicated stability only for crude oil solutions. The aggregate size dispersion was diferent for each type of crude and varied with respect to time. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed the type of morphology present for each type of asphaltene.

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The Effect of Solvent Nature and Dispersant Performance on Asphaltene Precipitation from Diluted Solutions of Instable Crude Oil

Cited by 26 publications

References 21 publications

Characterizing Asphaltene Deposition in the Presence of Chemical Dispersants in Porous Media Micromodels

Characterizing Asphaltene Deposition in the Presence of Chemical Dispersants in Porous Media Micromodels

A novel inhibitor for controlling Iraqi asphaltene problems

Characterization of Crude Oils and the Precipitated Asphaltenes Fraction using UV Spectroscopy, Dynamic Light Scattering and Microscopy

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