Publications Internationales

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Author: search.filters.author.Safri, AbdelhamidSubject: search.filters.subject.Crude oil

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    Comparative flow behavior of oil sludge and crude oils from algerian storage tanks
    (CNESE, 2025) Souas, Farid; Safri, Abdelhamid; Gueciouer, Abderazak
    This study investigates the flow behavior of tank bottom sludge and two crude oil samples by analyzing the variation of viscosity and shear stress with shear rate and temperature. The flow curves reveal that all samples exhibit non-Newtonian, shear-thinning behavior characterized by a distinct yield stress, particularly prominent in the sludge due to its high content of heavy fractions such as asphaltenes, resins, and solid particulates. Viscosity and shear stress consistently decrease with increasing temperature, a result of the thermal disruption of intermolecular forces and breakdown of microstructural networks. At low shear rates, sludge displays more pronounced shear-thinning behavior than crude oils, while at high shear rates, all samples approach Newtonian flow regimes due to molecular alignment and structural degradation. Model fitting shows the Herschel-Bulkley model best describes the sludge's rheology, whereas the Casson model better fits the crude oils under specific temperature conditions. Temperature sensitivity analysis (10–40 °C) indicates that crude oils experience greater viscosity reduction than sludge, with crude 1 showing the highest response due to its thermally labile composition. Yield stress also diminishes with temperature, reflecting the weakening of internal structural rigidity. These findings underscore the critical influence of composition and temperature on the flow properties of petroleum-derived fluids, with implications for pipeline transport and sludge management
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    Rheological behavior and microstructural properties of crude oil and emulsions (water/oil-oil/water)
    (Taylor & Francis, 2024) Yacine, Celia; Safri, Abdelhamid; Djemiat, Djamal Eddine; Benmounah, Abdelbaki
    An experimental study on crude oil (from the Tin Fouye Tabankort oil field in southern Algeria) was carried out. This study allowed us to understand the rheological behavior of this crude oil with these different emulsions and how it reacts under the effects of temperature and the inversion of its phase from E/H to H/E. So we measured the rheological characteristics by tests flow and dynamic mode at different temperatures from 10 °C to 50 °C and at different water concentrations (20.40.50.60 and 70%) at a fixed temperature of 20 °C. The increase in temperature results in a 31.84% reduction in the initial viscosity of the crude oil. The addition of the volumic fractions of water results in an increase in viscosity at the point of inverse, which will decrease the apparent viscosity of these emulsions where the emulsions (W/O) come from (O/W). This crude oil and their emulsions exhibit a non-Newtonian behavior with shear thinning. The dynamic analysis depends on the temperature and the percentages of water added to the crude oil. At the end, a microscopic analysis was added to verify the relationship between the shape and diameter of the water droplets in each emulsion and the viscosity variation.
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    Rheological behavior of an Algerian crude oil containing sodium dodecyl benzene sulfonate (SDBS) as a surfactant : flow test and study in dynamic mode
    (Elsevier, 2015) Djemiat, Djamal Eddine; Safri, Abdelhamid; Benmounah, Abdelbaki; Safi, Brahim