Waxphaltene Determinator Method for Automated Precipitation and Redissolution of Wax and Asphaltene Components

Schabron, John F.; Rovani, Joseph F.; Sanderson, Mark M.; Loveridge, Jenny; Nyadong, Leonard; McKenna, Amy M.; Marshall, Alan G.

doi:10.1021/ef300184s

Cited by 23 publications

(22 citation statements)

References 17 publications

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“…Previous work had showed how model compound distributed between the various WD fractions. , In this work the shift from shorter n -paraffins from Waxy A to longer n -alkanes for Waxy B was confirmed by performing WD analysis on Polywax 500 and 655 mixtures. Polywax 500 is a mixture of synthetic polyethylene from about C20–C76 and Polywax 655 contains higher MW waxes ranging from about C20–C100.…”

Section: Resultssupporting

confidence: 59%

“…The precipitated materials were redissolved using different temperature and solvent combinations. All separation profiles were electronically blank subtracted prior to peak integration. , The waxphaltene determinator (WD) divides the heavier (about >430 °C) waxy components in petroleum into two wax fractions: Waxy A and Waxy B. An example of a WD separation profile is provided in Figure .…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of Wax Inhibitor Performance through Various Techniques

et al. 2018

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Various techniques were used to compare the effectiveness of a commercially available wax inhibitor (WIA) to a newly developed wax inhibitor (WIEP) using a highly waxy Wyoming crude oilwhich causes plugging within wellbores and pipelines. The two additives were compared using centrifuge experiments, cold finger tests, and the precipitation and redissolution waxphaltene determinator (WD) method. Centrifuge tube experiments, and cold finger tests, showed that the newly developed WIEP additive was significantly more effective at reducing the amount of ambient temperature wax crystallites in the crude oil, as well as reducing the amount of wax deposited on a cold finger. WD analysis was performed on model compounds to differentiate between shorter and longer n-paraffins. Whole crude oils, ambient temperature waxes centrifuged from the oils, and waxes from cold finger deposits were also analyzed by the WD method. Taken together with high temperature gas chromatography, the WD profile of whole crude oils readily distinguishes shorter n-paraffins from the more problematic longer n-paraffins that are prone to crystallization at ambient temperature. For treated Elliott crude oil, the WD Analysis profile showed a consistent decrease in wax with WIA concentration to give a linear correlation; however, a less consistent change was observed with the WIEP additive. By applying the WD analysis to the additives themselves, it was elucidated that the WIEP additive contained components that were highly polar and/or more associated. This observation suggests that components in the WIEP additive may self-precipitate to a greater degree than becoming incorporated with the waxes during the WD separation. This effect caused the WIEP to appear as though it is not as effective as the WIA additive in the WD analysis.

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Section: Resultssupporting

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Evaluation of Wax Inhibitor Performance through Various Techniques

et al. 2018

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“…Since asphaltene is a solubility class of materials and not a single molecular species, its 34 chemistry is not unambiguously known. However, attempts have been made to determine the chemical 35 structure of asphaltene molecules [2,3,4,5]. This has led to two leading molecular architectures: island 36 and archipelago [6].…”

Section: Introduction 23mentioning

confidence: 99%

“…Since asphaltene is a solubility class of materials and not a single molecular species, its chemistry is not unambiguously known. However, attempts have been made to determine the chemical structure of asphaltene molecules. − This has led to two leading molecular architectures: island and archipelago . The island structure with one polycyclic aromatic core forms the basis of the Yen–Mullins hierarchical model of asphaltene self-assembly, − while the archipelago structure has two or more smaller polycyclic aromatic groups linked by aliphatic chains .…”

Section: Introductionmentioning

confidence: 99%

Determining the Kinetics of Asphaltene Adsorption from Toluene: A New Reaction–Diffusion Model

et al. 2017

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8Fouling by asphaltene, which constitutes the densest, most polar fraction of crude oil, poses a serious 9 problem for the oil production industry. In order to obtain a fundamental understanding of asphaltene 10 deposition it is necessary to determine both the thermodynamics and kinetics that govern this process. In 11 recent years, there have been numerous studies of the kinetics of asphaltene adsorption, however, a 12 consensus on the model that best describes asphaltene adsorption remains elusive. In this paper the 13 adsorption of asphaltene from solution in toluene onto a gold surface is investigated using a quartz crystal 14 microbalance inside a flow cell. The kinetics of adsorption depends on the state of asphaltene in solution 15 and the adsorption behaviour alters with long-time aging of asphaltene solutions. A model is developed 16 that links the kinetics of asphaltene adsorption to the bulk solution properties in terms of coexisting 17 monomer and multimer states. A large portion of deposited asphaltene is effectively irreversibly bound 18 and not easily removed by rinsing with toluene. The model suggests that asphaltene-asphaltene 19interactions play an important role in the formation of irreversibly bound deposits, which could lead to 20 fouling problems. 21 22

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“…The wax coprecipitation increases the apparent yield of asphaltenes, decreases the yield of waxes, and leads to incorrect determination of the composition and properties of asphaltenes and waxes, to provide misleading and ambiguous results in modeling and treatment programs. Methods for the separation of waxes from asphaltenes have been developed (Thanh et al 1999;Schabron et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Waxes in asphaltenes of crude oils and wax deposits

2016

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Composition and molecular mass distribution of n-alkanes in asphaltenes of crude oils of different ages and in wax deposits formed in the borehole equipment were studied. In asphaltenes, n-alkanes from C 12 to C 60 were detected. The high molecular weight paraffins in asphaltenes would form a crystalline phase with a melting point of 80-90°C. The peculiarities of the redistribution of high molecular paraffin hydrocarbons between oil and the corresponding wax deposit were detected. In the oils, the high molecular weight paraffinic hydrocarbons C 50 -C 60 were found, which were not practically detected in the corresponding wax deposits.

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Waxphaltene Determinator Method for Automated Precipitation and Redissolution of Wax and Asphaltene Components

Cited by 23 publications

References 17 publications

Evaluation of Wax Inhibitor Performance through Various Techniques

Evaluation of Wax Inhibitor Performance through Various Techniques

Determining the Kinetics of Asphaltene Adsorption from Toluene: A New Reaction–Diffusion Model

Waxes in asphaltenes of crude oils and wax deposits

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