Phase behaviour of Maya crude oil based on calorimetry and rheometry

Fulem, Michal; Becerra, Mildred; Hasan, Anwarul; Zhao, Bei; Shaw, John M.

doi:10.1016/j.fluid.2008.06.005

Cited by 60 publications

(73 citation statements)

References 28 publications

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“…Due to the limitation of computing the power and the complex compositions, the models were simplified reasonably to represent the complex crude oil, which makes it possible to simulate the viscosity–temperature properties. The phase behavior of crude oil with temperature has been investigated, and phase diagram details appear to vary from feedstock to feedstock. , As for our work, the type and number of molecules are far less than the actual system, so it is difficult for the quantitative data of phase transitions to be consistent with the experimental results. For each initial configuration, an NPT simulation was run for 1 ns to obtain the equilibrium density under different temperatures and a pressure of 1 bar.…”

Section: Methodsmentioning

confidence: 97%

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Zhu

Zhang

et al. 2021

Energy Fuels

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Heavy oil, with high viscosity and complex compositions, often faces a series of challenges in the process of its exploitation and utilization. There are huge amounts of compositions with different molecular structures in heavy oil, and it is a great challenge to clarify the influence of the microstructure of heavy oil on the rheological and viscosity–temperature properties. Based on the experimental data, such as acid value, element content, functional group type of the heavy oil, and so on, we constructed six types of heavy oils from three regions to reveal the unique properties of Karamay heavy oil. Molecular dynamics simulation was used to study the effects of the compositions and the aggregation structure on the rheological and viscosity–temperature properties of heavy oil. The results show that the rheological properties of Karamay heavy oil with low asphaltene concentration are dominated by molecular conformation, and heavy oil with molecules that are not easily stretched has a higher viscosity. When the concentration of asphaltene is high, the nanoaggregates formed by asphaltene molecules and their variation with shear rate affect the viscosity. Compared with the aggregates by the island structure asphaltene molecules, the larger nanoaggregate size of continental structure due to stronger π–π interaction leads to the increase in viscosity. However, the viscosity decreases faster with the increase in shear rate, which is attributed to the more orderly aggregate structure of polycondensed aromatic rings that can be easily pulled along the velocity plane. In addition, we found that metal ions, as a bridge, can interact with molecules containing different heteroatoms, forming larger clusters and increasing the viscosity of Karamay heavy oil. For the viscosity–temperature properties, the more intense thermal movement of molecules with the increased temperature weakens the interaction between the aromatic rings and decreases the viscosity of heavy oils.

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Section: Methodsmentioning

confidence: 97%

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Zhu

Zhang

et al. 2021

Energy Fuels

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Section: Introductionmentioning

confidence: 99%

“…These resources exhibit complex phase behaviors on their own [16][17][18][19] and in mixtures with light hydrocarbons 20 and non-hydrocarbons. 21,22 For example, phase diagrams for Athabasca Bitumen, Maya crude oil, and Safaniya vacuum residue have been prepared [16][17][18][19] . These fluids comprise well-dispersed nano-scale asphaltene-rich phase domains, and maltene-rich phase domains that undergo phase transitions in a largely independent manner [16][17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

“…21,22 For example, phase diagrams for Athabasca Bitumen, Maya crude oil, and Safaniya vacuum residue have been prepared [16][17][18][19] . These fluids comprise well-dispersed nano-scale asphaltene-rich phase domains, and maltene-rich phase domains that undergo phase transitions in a largely independent manner [16][17][18][19] . The asphaltene-rich phase domains comprise approximately 20 wt % of these fluids and are multiphase.…”

Section: Introductionmentioning

confidence: 99%

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Fickian and Non-Fickian Diffusion in Heavy Oil + Light Hydrocarbon Mixtures

Alizadehgiashi

Shaw

2015

Energy Fuels

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Diffusive mass transfer is expected to play a key role in existing and proposed solvent-added processes for heavy oil production. Composition-distance profiles arising during free diffusion scale as a function of the joint variable (distance/time^n w ). Simple fluids are governed by Fickian diffusion, where n w = 0.5. For nanostructured fluids the value of n w can be as low as n w = 0.25, known as the single file limit but more typically the value for the exponent falls between these two limits and is composition dependent. In this work, five published data sets comprising free diffusion composition profiles for Athabasca bitumen fractions and for Cold Lake bitumen + light hydrocarbons obtained using diverse apparatus, are probed from this perspective.Additional experimental results are provided for Athabasca bitumen + toluene mixtures over the temperature range 273 to 313 K, and results from positive and negative control experiments for two well-defined mixtures: (0.25 mass fraction carbon nanotubes + polybutene) + toluene, and polybutene + toluene, are also provided. The value of n w for the negative control experiment remains at 0.50 +/-0.05 over the entire composition range and for the positive control experiment, the value drops to n w = 0.30 +/-0.02 at low toluene mass fraction. While the quality of the diffusion profile data in the data sets analyzed is variable, the values of the exponent n w are shown to be light hydrocarbon dependent and increase from n w ~ 0.25 at low light hydrocarbon mass fraction up to n w ~ 0.50 at high light hydrocarbon mass fraction. Secondary convective effects are also noted in free diffusion experiment outcomes at long times. The industrial applications of these finding are currently being evaluated but it is clear that the time for light hydrocarbons to penetrate a fixed distance into nano-and micro-structured hydrocarbon resources is greater than the value anticipated for unstructured fluids.

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“…Steady shear and dynamic oscillatory tests [ 7 , 8 , 30 ] were performed for characterizing the rheological properties of the WPU dispersions with different solid contents as well as the WPU17-SF dispersions with different SF contents. An AR 2000ex rheometer (TA Instrument, New Castle, DE, USA) was used to perform all the tests.…”

Section: Methodsmentioning

confidence: 99%

Rheological and Mechanical Behavior of Silk Fibroin Reinforced Waterborne Polyurethane

et al. 2016

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Waterborne polyurethane (WPU) is a versatile and environment-friendly material with growing applications in both industry and academia. Silk fibroin (SF) is an attractive material known for its structural, biological and hemocompatible properties. The SF reinforced waterborne polyurethane (WPU) is a promising scaffold material for tissue engineering applications. In this work, we report synthesis and characterization of a novel nanocomposite using SF reinforced WPU. The rheological behaviors of WPU and WPU-SF dispersions with different solid contents were investigated with steady shear and dynamic oscillatory tests to evaluate the formation of the cross-linked gel structure. The average particle size and the zeta potential of WPU-SF dispersions with different SF content were examined at 25˝C to investigate the interaction between SF and WPU. FTIR, SEM, TEM and tensile testing were performed to study the effects of SF content on the structural morphology and mechanical properties of the resultant composite films. Experimental results revealed formation of gel network in the WPU dispersions at solid contents more than 17 wt %. The conjugate reaction between the WPU and SF as well as the hydrogen bond between them helped in dispersing the SF powder into the WPU matrix as small aggregates. Addition of SF to the WPU also improved the Young's modulus from 0.30 to 3.91 MPa, tensile strength from 0.56 to 8.94 MPa, and elongation at break from 1067% to 2480%, as SF was increased up to 5 wt %. Thus, significant strengthening and toughening can be achieved by introducing SF powder into the WPU formulations.

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Phase behaviour of Maya crude oil based on calorimetry and rheometry

Cited by 60 publications

References 28 publications

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Molecular Dynamics Simulation Reveals Unique Rheological and Viscosity–Temperature Properties of Karamay Heavy Crude Oil

Fickian and Non-Fickian Diffusion in Heavy Oil + Light Hydrocarbon Mixtures

Rheological and Mechanical Behavior of Silk Fibroin Reinforced Waterborne Polyurethane

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