Browsing by Author "Djemiat, Djamal Eddine"

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Comparative studies of the rheological behavior and microstructural properties of emulsions (oil/distilled water phase) and (oil/Lias water phase)
(Taylor and Francis, 2018) Djemiat, Djamal Eddine; Safri, Abdelhamid; Benmounah, Abdelbaki
The rheological behavior of crude oil and their emulsions were investigated as a function of two water types (distilled water and the LIAS water). The focus of this work is to obtain more knowledge about the effect of LIAS water concentration, which used to maintain pressure and produced from production of crude oil in the oil fields Tin Fouye Tabankort-south Algeria, on the rheological properties of crude oil. The rheological parameters were measured by using AR-2000 rheometer at 15 °C under dynamic and shear testing conditions. The measured data were first classified into two groups for Newtonian and non-Newtonian fluids. Depends on the type and concentration of water, the non-Newtonian behavior was described in better way by the Casson, Power law and the Herschel–Bulkley models. The results indicated that the viscosity, the yield stress, the elastic modulus, (G′), the loss modulus, (G″), and the microstructure of the prepared emulsions not only varied with water concentration but also by water types.
Improvement of rheological properties of Algeria crude oil by addition of extra-light crude oil and a surfactant agent
(Taylor and Francis Online, 2018) Djemiat, Djamal Eddine; Safri, Abdelhamid; Benmounah, Abdelbaki
Effect of surfactant and extra-light crude oil addition on the rheologicalbehaviors of an Algeria crude oil in order to improving its flowability werestudied at low temperature. These rheological properties include steadyflow behavior, yield stress and viscoelastic behavior. An AR-2000 rheometerwas employed in all of the rheological examination tests. Results showthat Toluene and extra-light crude oil addition causes a strong reductionin viscosity, the yield stress and can effectively increase of crude oil trans-port capacity. The toluene addition gets its best flow capacity and lowestviscosity at 6%. The extra-light crude oil addition obtains its best flow cap-acity and lowest viscosity at 50%. The viscoelasticity character of the crudeoil has indicate a significantly influence by the addition of Toluene andextra-light crude oil.
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.
Rheological behavior of Algerian crude oil: effect of temperature and refined product
(Taylor and Francis Online, 2018) Souas, Farid; Safri, Abdelhamid; Benmounah, Abdelbaki; Djemiat, Djamal Eddine
The rheological behavior and its variation with temperature and refined product concentration of a crude oil sample coming from a quagmire of the separation station of Tin Fouye Tabankort oilfield/southern Algeria were investigated experimentally. The experiments were carried out at various temperatures (20, 30 and 50 °C) over the shear rate range of 0 to 700 s−1 by using a controlled stress rheometer (AR 2000, TA Instrument). The results showed that the crude oil exhibit non-Newtonian of shear thinning behavior at low shear rate and Newtonian behavior at high shear rate and was adequately described by Casson and Herschel–Bulkley models. The rheological measurements through the steady flow test and viscoelastic behavior, including the storage modulus (G′), loss modulus (G″), and complex modulus (G*), has indicated that the rheological properties of the crude oil were greatly influenced by the temperature and the additive concentration.
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