Asphaltene — Viscosity Relationship Of Processed And Unprocessed Bitumen

Chakma, A.; Islam, M.R.; Berruti, Franco

doi:10.1007/978-1-4615-2456-4_1

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Here, we exploit the colloidal and reconstitution theories of heavy oil, − allowing for the existence of distinct solid and liquid phases. Assuming that the pore volume (less connate water) is occupied by crude oil, we partition it between the volume occupied by maltene (asphaltene-free oil) and that occupied by deposited asphaltene.…”

Section: Model Formulationmentioning

confidence: 99%

Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

2011

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An investigation into the impairment of permeability in porous media as a result of the deposition of asphaltene particulates in a flowing stream is presented. By incorporating kinetics of asphaltene deposition under dynamic conditions into the deep-bed filtration (DBF) theory, we have developed a new asphaltene deposition and impairment model, which has only three tuning parameters. The parameters, characterizing the key aspects of the deposition process and porous-media hydraulics, are the stabilized filtration coefficient λ 0 , the filtration time constant τ, and the exponent n, relating porosity and permeability. The resulting models are tested against a large number of experimental data sets, representing common porous media and particulate streams. The validation exercise indicates that our dynamic-filtration model is capable of rationalizing about 82% of the reference data sets within 7%.

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Section: Model Formulationmentioning

confidence: 99%

Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

2011

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“…The TC control combined maltenes-asphaltenes fraction displayed a viscosity of 2.0 × 10 4 ± 0.3 × 10 4 cP, while the low and high pressure HDC control runs displayed viscosities of 8 × 10 4 ± 2 × 10 4 cP and 5 × 10 4 cP, respectively. Higher asphaltenes content relative to the product oil as well as evaporative losses of the lighter fractions lead to higher maltenes-asphaltenes fraction viscosity, with varying degrees of influence depending on other factors such as oil composition. , While asphaltene yields are comparable between the three control samples, the total losses in the form of volatiles are significantly higher for the HDC control experiments. Subsequently, the viscosities after toluene evaporation were much higher, as evident from Figure .…”

Section: Resultsmentioning

confidence: 90%

Hydrocracking of Athabasca VR Using NiO-WO₃ Zeolite-Based Catalysts

et al. 2018

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Hydrocracking of Athabasca vacuum residue (AVR) was carried out in an autoclave using particle and fiber forms of NiO-WO3 zeolite-supported catalyst. AVR hydrocracking was performed at 400 °C at low and high H2 pressure of 70 and 365 psi, together with the corresponding control thermal cracking runs. The yield of the different products and the quality of the upgraded liquid was used to assess the catalyst performance. Similarity among energy consumption for the different samples suggested major thermal cracking endothermic reactions. In general, the catalytic runs provided better quality maltene product, whereas better quality product oil was only attained at high pressure. The catalytic runs at low H2 pressure gave the highest yield of combined asphaltenes and toluene insolubles. This yield, on the other hand, was the lowest for the fiber form at high H2 pressure. Simulated distillation results captured the superior performance of the fiber catalyst at high H2 pressure and showed ∼50% conversion of the residue. On the other hand, the zeolite particles showed poor performance at high pressure with only ∼30% residue conversion.

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“…From these profiles, the retardation effects of reservoir-wide damage are apparent. It is worth pointing out that in the present simulations, we have not taken into account the favourable effects of potential oil viscosity reduction resulting from asphaltene drop-out (Luo and Gu, 2005;Chakma et al, 1994).…”

Section: Damage Effects On Reservoir Performancementioning

confidence: 99%

Modelling Asphaltene-Induced Formation Damage in Closed Systems

Lawal

Vesovic

2010

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This paper implements a simple one-parameter semi-analytic model for asphaltene-induced reduction of porosity, pore-radius and permeability in closed systems. By treating sedimentation as the dominant deposition mechanism, dynamics of asphaltene deposition under "stagnant" conditions is provided, elucidating the dependence of damage rate on the size of asphaltene aggregates as well as rock and fluid properties. Parametric studies indicate that while the rate of formation degradation depends on rock and fluid properties, ultimate severity of impairment is primarily controlled by in-situ asphaltene content. The proposed model has been used to explain the general observation that light oil systems are more vulnerable to asphaltene damage, than the heavy oil systems. Validity of proposed model is demonstrated by comparing with available experimental datasets that include both sandstone and carbonates. In all cases, experimental results have been matched within 7% accuracy using the proposed model with a single adjustable parameter. Furthermore, thermal simulation studies conducted on a hypothetical but representative heavy oil reservoir highlight the detrimental effects of impairment on field-scale oil recovery and thermal efficiency. Both the models and results presented should be useful for studying impairments induced by asphaltene and other deposits.

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Asphaltene — Viscosity Relationship Of Processed And Unprocessed Bitumen

Cited by 6 publications

References 7 publications

Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

Hydrocracking of Athabasca VR Using NiO-WO₃ Zeolite-Based Catalysts

Modelling Asphaltene-Induced Formation Damage in Closed Systems

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Asphaltene — Viscosity Relationship Of Processed And Unprocessed Bitumen

Cited by 6 publications

References 7 publications

Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

Hydrocracking of Athabasca VR Using NiO-WO3 Zeolite-Based Catalysts

Modelling Asphaltene-Induced Formation Damage in Closed Systems

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Product

Resources

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Hydrocracking of Athabasca VR Using NiO-WO₃ Zeolite-Based Catalysts