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Solvent deasphalting (SDA) of heavy oil generally uses alkanes, from propane to heptane. The solvent power of propane is the weakest, and that of heptane is the strongest. Ethyl ether has slightly str...
Integrated Modelling Methods for Asphaltene Deposition in Wellstring
Precipitation Asphaltene deposition experiment Asphaltene deposition modelling Thermodynamic modelling Wellstring
2010/9/8
This paper introduces a new comprehensive model for description of asphaltene deposition behavior in wellstring. The mechanisms of asphaltene deposition have been investigated experimentally using an ...
Mechanisms of Asphaltene Aggregation in Toluene and Heptane Mixtures
Asphaltene Aggregation mechanism Diffusion limited aggregation Reaction limited aggregation Critical micelle concentration Fractal dimension
2010/9/8
The nature of aggregation kinetics of colloidal asphaltene particles in mixture of toluene and heptane was investigated by utilizing a polarizing microscope with appropriate magnification. The concent...
Effects of Asphaltene Deposition on Oil Reservoir Characteristics Including Two-phase Flow
Asphaltene deposition Reservoir modeling Network modeling Water breakthrough
2009/8/4
Prediction of the effects of asphaltene deposition on oil reservoir parameters during water flooding was investigated in two scenarios of oil production wells with controlled oil rate and controlled ...
Developing of Scaling Equation with Function of Pressure to Determine Onset of Asphaltene Precipitation
Asphaltene Scaling equation Gas injection EOR Genetic algorithm
2009/8/4
In this study a simple and applicable scaling equation as a function of pressure, molecular weight, dilution ratio (solvent) and weight percent of precipitated asphaltene has been developed. This equ...
Predicting Asphaltene Precipitation by Simple Algorithm Using Solubility Parameter Calculated Based on Peng-Robinson Equation of State
Asphaltene precipitation Flory-Huggins solution theory Solubility parameter
2009/8/4
Asphaltene precipitation is frequently the cause of increased cost of oil production in the petroleum industry. To avoid or minimize problems due to asphaltene precipitation, a model to predict the a...
Measurement of Vacuum Residue and Asphaltene Fluid Properties at Process Conditions
Fluid property Surface tension Viscosity Contact angle
2009/7/24
The fluid properties of interfacial tension and viscosity, and the fluid-solid interactions embodied in the contact angle, are important in a wide range of phenomena that affect the processing of the...
Observation of Stepwise Association of Petroleum-derived Asphaltene and Maltene Components by Surface Tension Measurements
Asphaltene Maltene Surface tension Stepwise association Micelle
2009/7/24
The association behaviors of asphaltene (heptane insoluble fraction) and maltene (heptane soluble fraction) fractionated from Iranian Light (IL) vacuum residue were investigated by measuring the surf...
Effects of Asphaltene Content in Atmospheric Residue and Mean Pore Size of Catalyst on Initial Deactivation of Hydrodesulfurization Catalyst
Hydrotreating Atmospheric residue Catalyst deactivation rate
2009/7/24
(HDS) of atmospheric residue (AR) over Ni-Co-Mo catalysts supported on γ-alumina was carried out to examine the effect of alumina pore size on HDS activity, hydrodemetallization (HDM) activity and ini...
Involvement of Asphaltene Decomposition in the Rapid Deactivation of Hydrodesulfurization Catalysts under Conditions for Deep Desulfurization of Atmospheric Residue
Hydrodesulfurization catalyst Atmospheric residue hydrotreating
2009/7/24
The effect of asphaltene (ASP) decomposition on catalyst deactivation under deep desulfurization conditions was investigated by reduction of sulfur from 0.3 to 0.1 mass% in a treated atmospheric resi...
Remedial measures against formation damage by asphaltene precipitation and deposition
asphaltene control measure precipitation deposit dispersant solvent
2009/5/7
This paper describes the results of an investigative case study to identify the causes of productivity decline in an oil well and a successful chemical treatment to restore productivity.