Aggregate structure analysis of Colombian heavy crude oil-derived asphaltenes using small angle 
X-ray scattering

Morante, Lina R.; Poveda, Juan Carlos; Montiel, R.; Henao, J. A.

doi:10.29047/01225383.73

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…SAXS experimental results can be compared to calculations of scattering length density using chemical composition. This technique is applicable to obtain the size from radius of gyration and power law exponents providing details about physical properties of the crude oil sample [38][39][40][41][42][43][44][45].…”

Section: Small-angle X-ray Scattering (Saxs)mentioning

confidence: 99%

Wax Deposition in Crude Oil Transport Lines and Wax Estimation Methods

Alnaimat¹,

Ziauddin²,

Mathew³

2020

Intelligent System and Computing

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Petroleum industry is one of the major industries serving the energy demands. Flow assurance is essential for providing continuous fuel supply. Wax deposition is the main issue that affects flow assurance or reduces the efficiency of transporting crude oil. As the maintenance cost of repairing and troubleshooting is very high, addressing issues related to flow assurance becomes critical in the petroleum industry. This chapter will explore methods used for reducing, cleaning, and monitoring deposition of wax. Wax dissolved in the crude oil gets crystallized causing accumulation across the pipe walls once the bulk temperature of the crude oil gets lower than wax appearance temperature (WAT). Mechanical, thermal, chemical, and microbial methods highlighting general practice in the industry are discussed in this chapter. Next, the direct techniques providing information about the numerical wax deposition models used along with scientific measurement techniques are emphasized. Later, the indirect measurement techniques are discussed providing information about the external probing and nondestructive techniques to obtain information about wax layer deposition inside the pipe. The role of artificial intelligence and use of fuzzy logic for effective wax prediction or in developing the existing wax numerical models are emphasized in the last section.

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Section: Small-angle X-ray Scattering (Saxs)mentioning

confidence: 99%

Wax Deposition in Crude Oil Transport Lines and Wax Estimation Methods

Alnaimat¹,

Ziauddin²,

Mathew³

2020

Intelligent System and Computing

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“…The SAXS technique was used to characterize the structure of n -C 7 asphaltene aggregates as a function of the concentration in toluene solutions . For concentrations of ∼0.1 and ∼1 mg/L, the predominant colloidal particles had a radius of gyration of a few nanometers and were compact surface fractal objects, such as those in Figure D.…”

Section: Experimental Evidence Of Nanocolloidal Particles In Kerogen ...mentioning

confidence: 99%

Colloidal Asphaltenes—Non-extinct “Dinosaurs” in Native Petroleum

Evdokimov

2019

Energy Fuels

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One of the important paradigms of fundamental petroleum geochemistry has been (and still is) that native asphaltenes in present day crude oils originated in the respective source rocks and are representative of the molecular composition in ancient organic deposits. The survival of “prehistoric” molecular species is enabled by shielding them in complex macromolecular structures of asphaltene nanocolloidal particles. In addition, the maturity of petroleum expelled from the source may define the structures of asphaltene colloidal aggregates, as indicated by recent advances in colloid science. On the other hand, in applied asphaltene research, the above paradigm is most often ignored, while its revitalization may improve our understanding of asphaltene behavior in native crude oils and, in particular, may provide a new criterion for potential instability of some crude oils with respect to asphaltene precipitation and deposition.

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“…Each of these fractions has a particular solubility in paraffinic (such as heptane), aromatic (such as toluene), and polar (such as dichloromethane) solvents. Depending on the proportions of these fractions as well as its tendency to precipitate organic scales, it is possible to classify a crude oil as stable or unstable. , Regardless of the oil, asphaltenes present the greatest challenge due to their influence on the general behavior of crude oil, such as its emulsifying tendency, the precipitation of organic scales, and its viscosity. , Asphaltenes are difficult to characterize because they are defined in terms of their solubility and not their composition. For example, different “asphaltenes” can be obtained from the same crude oil simply by changing the precipitant used. , Several techniques have been employed in asphaltene characterization, such as infrared spectroscopy (IR), − matrix-assisted laser desorption/ionization mass spectrometry (MALDI/TOF), ultrasmall-angle X-ray scattering, X-ray diffraction (XRD), nuclear magnetic resonance (NMR), Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS), , and atomic force microscopy (AFM) .…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of a Synthetic Crude Oil Using Petroleomics and Molecular Dynamics Simulations: A Multistructural Approach to Understanding Asphaltene Aggregation Behavior

et al. 2022

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This study focuses on evaluating the differences between describing the asphaltene fraction using a unique average molecular structure compared to a multistructural approach by examining its effects on aggregation behavior using molecular dynamics (MD). Three asphaltene representations were considered: a hydrocarbon skeleton (without heteroatoms), a single average asphaltene molecular structure (with heteroatoms), and a multistructural approach (several molecular structures with different characteristics and heteroatom contents). Representative aromatic and resin molecules were also employed to describe the maltene content. In total, four systems were evaluated by MD simulations: the three asphaltene representations dissolved in Heptol-50 (1:1 mixture of n-heptane and toluene) at a concentration of 7 wt %, as well as the multistructural representation of asphaltenes dissolved in its respective maltene. Asphaltene aggregation behavior was assessed by using the radial distribution function (RDF), the asphaltene− asphaltene interaction energies, and the size distribution of the asphaltene aggregates. Our results showed that a multistructural approach to describing asphaltenes could more accurately reproduce the elemental analysis data than the conventional unistructural approach. In addition, the size of the asphaltene aggregates was found to double when a multistructural representation was used compared to a unistructural approach. Furthermore, heteroatom content increased the average size of the asphaltene aggregates by a factor of 1.5. Interestingly, maltenes reduced aggregate sizes by a factor of 0.4, presumably due to the role of the resins and the structure of the aromatic compounds proposed for the synthetic crude oil. Consequently, this study presents a promising approach to describe the complexity of oil by using a multistructural representation of the asphaltenes, which can be extensively implemented in molecular dynamics studies.

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Aggregate structure analysis of Colombian heavy crude oil-derived asphaltenes using small angle X-ray scattering

Cited by 3 publications

References 29 publications

Wax Deposition in Crude Oil Transport Lines and Wax Estimation Methods

Wax Deposition in Crude Oil Transport Lines and Wax Estimation Methods

Colloidal Asphaltenes—Non-extinct “Dinosaurs” in Native Petroleum

Reconstruction of a Synthetic Crude Oil Using Petroleomics and Molecular Dynamics Simulations: A Multistructural Approach to Understanding Asphaltene Aggregation Behavior

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