Impact of asphaltene and normal paraffins on methane-synthetic oil interfacial tension: An experimental study

Experimental investigation into Fe3O4/SiO2 nanoparticle performance and comparison with other nanofluids in enhanced oil recovery

“…The governing mechanism in oil recovery by injecting the Fe 3 O 4 nanofluid is the controlling of asphaltene precipitation. As it has also been mentioned in previous studies (Doryani et al 2015(Doryani et al , 2016, these nanoparticles decrease the precipitation of asphaltenes on the glass by adsorbing asphaltene particles on their surfaces so less blockage of throats by precipitation is detected. Consequently, a reduction in asphaltene precipitation was observed by this injection while other mechanisms are active too (Fig.…”

Experimental Study on Kinetics of Asphaltene Aggregation in a Microcapillary

“…Specifically, they are referred to as the fraction of crude oil which is insoluble in normal alkanes such as n-heptanes and n-pentane but soluble in aromatics such as toluene and xylene. [3][4][5] The solubility of asphaltene or asphaltene-oil bulk phase equilibria is altered when temperature, composition or pressure of crude oil is changed during oil recovery and production. [6][7][8][9] The destabilized asphaltene will precipitate, aggregate and tend to create larger agglomerates from crude oil, and deposit in porous media, leading to reduced porosity and permeability, increased reservoir fluid viscosity, pore clogging, as well as surface wetting alteration.…”

“…Asphaltenes are commonly defined as a solubility class of crude oil components. Specifically, they are referred to the fraction of crude oil which is insoluble in normal alkanes such as n -heptane and n -pentane but soluble in aromatics such as toluene and xylene. − The solubility of asphaltene or asphaltene–oil bulk phase equilibria is altered when the temperature, composition, or pressure of crude oil is changed during oil recovery and production. − The destabilized asphaltene will precipitate, aggregate, and tend to create larger agglomerates from crude oil, and deposit in porous media, leading to reduced porosity and permeability, increased reservoir fluid viscosity, and pore clogging, as well as surface wetting alteration. − This significantly damages reservoir formation. Therefore, it is crucial to build a comprehensive understanding on asphaltene destabilization (precipitation/aggregation) at a micropore scale.…”

Visualization of asphaltene precipitation and deposition in a uniformly patterned glass micromodel

“…Accordingly, asphaltenes are commonly defined as solubility class of crude oil components. Asphaltenes are soluble in aromatics such as toluene and xylene, while insoluble in normal alkanes such as n-pentane and nheptane [5,7,8]. The stability of asphaltene in crude oil may be disrupted due to changes in temperature, pressure, composition and surface characteristics of rock/fluid interface [9][10][11].…”