BACKGROUND AND HYPOTHESIS In the oil industry, asphaltenes are known for their tendency to aggregate in solution and to deposit on surfaces, with both properties being connected with operational problems associated with recovery, production and refining. Interactions involving asphaltenes and other crude oil components have been a major aspect of investigation in attempting to understand the fu...

The conditions of petroleum extraction may allow asphaltenes to precipitate, causing deposition that clogs wells, pipes and equipment, consequently reducing productivity. In this work, the solubility parameters precipitation onset polar fractions heavy crudes from Brazilian fields were estimated using a simplified system n-heptane/toluene mixtures. Asphaltenes extracted by two different methods...

One of the possible fluid-fluid interactions during water-flooding in oil reservoirs, that is still debated, effect injected brine salinity on asphaltene destabilization. If precipitation induced by changes reservoirs and surface facilities, this could have a massive impact economy low project. Therefore, study aims to investigate amount governing destabilization mechanisms. Direct measurements...

[1] Auroral substorms are the result of a complex process involving coupling between the solar wind, magnetosphere and ionosphere. In this study, the objective is to understand the processes that precede what is perhaps the most fundamental aspect, the brightening of a preexisting arc at onset. The notion that this brightening provides an indicator of substorm onset remains one of the few aspec...

The Taguchi design of experiments (DOE) approach is adopted here to evaluate the impact ofeffective factors such as nanoparticles type, nanoparticles to model solution mass ratio, asphaltenestructure, and temperature on asphaltene adsorption equilibrium. Herein, the toluene-asphaltenesolution model is applied. Three commercially nanoparticles (SiO2, Al2O3, and TiO2) are used.<...

Asphaltenes are known to cause problems related flocculation, precipitation, and plugging, either in the formation, production lines, processing equipment. Different models have been proposed predict thermodynamic conditions under which asphaltenes precipitate over past years. This work analyses performance of various on their capability match literature experimental data precipitated asphalten...