The Non-Linear Behaviour of Oil Disperse Systems At the Technological Processes of Oil Industry

Syunyaev, R. Z.; Safieva, R. Z.; Syunyaev, Z. I.

doi:10.2516/ogst:1997027

Cited by 6 publications

(10 citation statements)

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“…These films greatly reduce oil penetrability of porous media . Adsorption and the following deposit formation are important problems in refinery. , …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Petroleum Asphaltenes onto Reservoir Rock Sands Studied by Near-Infrared (NIR) Spectroscopy

et al. 2009

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Asphaltenes are the most polar petroleum macromolecules. The high polarity causes their rather high superficial activity. A relatively high value of asphaltene adsorption means that this substance is responsible for many phenomena in the petroleum industry, such as well bore plugging and pipeline deposition, stabilization of water/oil emulsions, sedimentation and plugging during crude oil storage, adsorption on refining equipment, and coke formation. The knowledge of kinetic and thermodynamic parameters of adsorption opens a regulation opportunity for the capillary number and wettability. In perspective, it opens a way for physical and chemical engineering of liquid-solid interfaces in the oil industry. In this study, the adsorption parameters of petroleum asphaltenes on quartz, dolomite, and mica sands were investigated using near-infrared (NIR) spectroscopy. Each adsorbent was fractioned in its own particle size range, and the particle size was estimated. The experimental adsorption data were theoretically modeled using Langmuir adsorption. The maximal adsorbed mass density, the adsorption equilibrium constant, and adsorption/desorption rate constants were calculated. The initial stage of the colmatage mechanism for the petroleum collector based on capillary aggregation assumption is offered. Among investigated adsorbents, the highest asphaltene adsorption takes place in the case of mica.

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“…These films greatly reduce oil penetrability of porous media . Adsorption and the following deposit formation are important problems in refinery. , …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Petroleum Asphaltenes onto Reservoir Rock Sands Studied by Near-Infrared (NIR) Spectroscopy

et al. 2009

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“…Crude oils with very high content of resins can contain a significant amount of asphaltenes in the form of stable colloidal solution. 31 Under the external factors such as addition of lyophobic solvents, these structures destabilize and aggregate into larger (>50 nm) and denser structures, 32 which can precipitate into solid phase, forming deposits. 33−36 The colloidal structure of bitumen was first described by Nellensteyn in 1923, 37 and the model was further developed by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Influence of High-Molecular n-Alkane Associates on Rheological Behavior of the Crude Oil Residue

et al. 2022

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In this paper, we present the results of chemical and physical investigations of the crude oil residue of low-sulfur but high-paraffin-base crude oil produced from the Mangyshlak (Kazakhstan) reservoir. The object contains 14.6 wt % of resins and significant amounts of high-molecular alkanes. A non-Newtonian behavior of the system is preserved even at 70–90 °C. 1H NMR data revealed divergence in temperature-dependent ratios corresponding to the low-viscous liquid petroleum products. The experimental results indicate the existence of associations of n-alkanes among themselves, as well as with resins and asphaltenes in the composition of the crude oil residue sample. In paraffin-base crude oil, the size of such associates (coacervates) is in the range of 100–300 nm. The associative behavior of medium- and long-chain n-alkanes is explained by their existence in transitional plastic (rotator) phases. As building blocks, associates of n-alkanes can be combined into worm-like structures due to adsorption of resins and asphaltenes on their surface and adhesion, thereby determining the non-Newtonian behavior and thixotropy of the system. Worm-like structures may be partially destructed under shear thinning (torn into shorter pieces) but can regenerate their structure over time. The optical and electron microscopy results justify the asphaltene aggregation model proposed by Balestrin and Loh. The formation of coacervates from asphaltene and concomitant molecules, which are surrounded by solvation shells of high-molecular alkanes, is evidenced. It is proposed that high-molecular n-alkane associates, as well as coacervates containing asphaltene and concomitant molecules, are compositional parts of many oil dispersed systems.

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“…According to current concepts, crude oils are colloidal systems. − Asphaltenes and resins comprise the dispersed phase of such systems, while saturates and aromatics are the continuous phase. Asphaltene precipitation is one of the key problems of oil industry.…”

Section: Introductionmentioning

confidence: 99%

New Colloidal Stability Index for Crude Oils Based on Polarity of Crude Oil Components

Likhatsky¹,

Syunyaev²

2010

Energy Fuels

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In the oil industry, colloidal stability indices based only on the crude oil composition are used to evaluate asphaltene stability. However, as shown in the literature, such indices are unable to correctly determine the behavior of asphaltenes in crude oils. In this study, the dipole moments of the model structures of asphaltene molecules were calculated, and it was found that asphaltenes from unstable crude oils are more polar than those from stable crude oils. Thus, asphaltene precipitation and deposition depend on the polarity of asphaltenes. On the basis of obtained results, a new colloidal stability index for crude oils is proposed. It takes into account both the crude oil composition and the polarity of crude oil components. Using sixteen crude oils as an example, it was shown that the new index is capable of predicting asphaltene precipitation.

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The Non-Linear Behaviour of Oil Disperse Systems At the Technological Processes of Oil Industry

Cited by 6 publications

References 0 publications

Adsorption of Petroleum Asphaltenes onto Reservoir Rock Sands Studied by Near-Infrared (NIR) Spectroscopy

Adsorption of Petroleum Asphaltenes onto Reservoir Rock Sands Studied by Near-Infrared (NIR) Spectroscopy

Influence of High-Molecular n-Alkane Associates on Rheological Behavior of the Crude Oil Residue

New Colloidal Stability Index for Crude Oils Based on Polarity of Crude Oil Components

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