Effect of heavy asphaltene on stability of residual oil

Tojima, M.; Suhara, Shinichiro; Imamura, Masao; Furuta, Akihiro

doi:10.1016/s0920-5861(98)00163-1

Cited by 61 publications

(56 citation statements)

References 2 publications

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“…Initial asphaltenes of oil from the bottom of the reservoir are enriched in A1 asphaltenes (64.6%) and depleted in A2 asphaltenes (8.1%) while asphaltenes from the top of the reservoir contains less A1 asphaltenes (49.4%) and twice the amount of A2 asphaltenes (15.7%) [31]. The rest part of asphaltenes is presented by the intermediate fraction-a mixture of A1 and A2 asphaltenes [12]. This may be stipulated by the fact that asphaltenes in both cases exist only as nanoaggregates in solutions with a low asphaltene concentration.…”

Section: Resultsmentioning

confidence: 99%

“…Asphaltenes under investigation were precipitated from the crude oils with a 40-fold excess of nhexane followed by separation into three asphaltene fractions according to their ability to form the aggregates [12]. It is assumed that the first asphaltene fraction that is precipitated under the minimal addition of the precipitant, is a concentrate of A1 asphaltene molecules (the "continental" type), while the third fraction, which remains in solution, presented by A2 asphaltene molecules (the "archipelago" type).…”

Section: Methodsmentioning

confidence: 99%

“…It is assumed that the first asphaltene fraction that is precipitated under the minimal addition of the precipitant, is a concentrate of A1 asphaltene molecules (the "continental" type), while the third fraction, which remains in solution, presented by A2 asphaltene molecules (the "archipelago" type). The intermediate fraction is a mixture of A1 and A2 asphaltene molecules [12].…”

Section: Methodsmentioning

confidence: 99%

“…At present, two asphaltene molecule types-"continental" (A1 fraction) and "archipelago" (A2 fraction) are adopted as the basic models ( Figure 2) [10][11][12][13][14][15]26]. It should be noted that in crude oils asphaltene aggregates of both types exist in various proportions.…”

Section: Introductionmentioning

confidence: 99%

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Supramolecular Structures of Oil Systems as the Key to Regulation of Oil Behavior

Az¹,

Ee²,

Vn³

et al. 2013

J Pet Environ Biotechnol

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The paper is devoted to investigation of supramolecular structures formed by high-molecular components of oil -asphaltenes and waxes. Petroleum asphaltenes that are characterized by their ability to self-organization can be considered as a polydisperse system. The aggregation of A1and A2 asphaltenes both in toluene solution and in diluted heavy oils was studied by dynamic light scattering technique. The stabilizing role of resins was confirmed. Due to the fact that the supramolecular structures in oils can be also formed by high molecular microcrystalline waxes, their influence as well as A1 and A2 asphaltenes on wax crystallization process was evaluated using optical microscopy. The effect of the different molecular structures of asphaltenes (A1 and A2) on the rheological properties of crude oils was also observed. Self-organization of asphaltenes directly in heavy high-viscosity oils with high content of resins was investigated by varying the ratios oil:precipitant. It was shown that extremely stable supramolecular structures in heavy oils had been formed. The influence of ultrasonic action for the destruction of stable supramolecular structures and the reduction of oil viscosity were considered.Also petroleum asphaltenes can be the indicators of many processes that occur in the reservoir. We have shown the possibility of using the gradient of asphaltenes, as well as their structure, to confirm the influx of deep light hydrocarbons in carbonate reservoirs. Thus, all obtained results of investigation of structure formation processes will let regulate the macroscopic properties of heavy oils in the future and identify the processes occurring in the reservoir.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Supramolecular Structures of Oil Systems as the Key to Regulation of Oil Behavior

Az¹,

Ee²,

Vn³

et al. 2013

J Pet Environ Biotechnol

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“…The possible methods of preventing asphaltene precipitation are the addition of aromatic compounds or use of asphaltene stabilizers (inhibitors). In various periods many investigators have analyzed the in vitro effect of the various chemical compounds on precipitation of asphaltenes in oils and model asphaltene systems [15][16][17][18][19][20]. For example, in the paper [21] the effect of three groups of additives on asphaltene precipitation was studied: aromatic compounds, heteroatom compounds (O, S, N) and hydrogen donor solvents (tetraline, decaline).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of Composite Solvent and Asphaltenes Contents on Efficiency of Heavy Oil Recovery Processes at Injection of Light Hydrocarbons

Borisov¹,

Milordov²,

Yakubova³

et al. 2018

Recent Insights in Petroleum Science and Engineering

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The current state of research in the field of solvent injection techniques for increase of heavy oil production efficiency is discussed in the chapter. As a result of a series of experiments on the physical modeling of oil displacement processes in a porous medium in large-sized model, features of asphaltene precipitation and the formation of fixed residual oil upon injection of solvent based on light alkanes are revealed. The oil displacement by n-hexane was studied and the difference in the composition of residual oil in the zones of dispersion and diffusion has been shown. The influence of the composition of asphaltenes peculiarities on the dynamics of oil recovery and on the accumulated oil recovery during the injection of n-hexane, as well as the composition and quantity of asphaltenes precipitated in the porous medium, has been estimated. The effect of toluene and nonylphenol additives on the proportion of asphaltenes in the residual oil and cumulative oil recovery has been evaluated using the Ashalchinskoye field oil as an example of heavy oil in the physical modeling of injection of n-hexane as the base solvent.

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Asphaltenes

Ramirez-Corredores¹

2017

The Science and Technology of Unconventional Oils

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Effect of heavy asphaltene on stability of residual oil

Cited by 61 publications

References 2 publications

Supramolecular Structures of Oil Systems as the Key to Regulation of Oil Behavior

Supramolecular Structures of Oil Systems as the Key to Regulation of Oil Behavior

Experimental Study of the Effect of Composite Solvent and Asphaltenes Contents on Efficiency of Heavy Oil Recovery Processes at Injection of Light Hydrocarbons

Asphaltenes

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