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Measurement of the Rheology of Crude Oil in Equilibrium with CO2 at Reservoir Conditions

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Light-scattering study of petroleum asphaltene aggregation.

Y G Burya, I K Yudin, V A Dechabo

|March 25, 2008

Summary

This study uses dynamic light scattering to investigate asphaltene aggregation in crude oils. Researchers observed different aggregation behaviors, including diffusion-limited and reaction-limited processes, and proposed a crossover kinetics model.

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Area of Science:

Colloid and Surface Science
Materials Science
Petroleum Chemistry

Background:

Asphaltenes are complex colloidal structures in crude oil.
Understanding asphaltene aggregation is crucial for petroleum production and refining.
Opaque nature of asphaltene colloids presents investigation challenges.

Purpose of the Study:

To investigate the aggregation kinetics of asphaltene colloids in crude oils and hydrocarbon mixtures.
To characterize different aggregation regimes and their transitions.
To develop a model for crossover kinetics in asphaltene aggregation.

Main Methods:

Utilized dynamic light scattering (DLS) with a novel optical setup.
Investigated opaque, strongly light-absorbing asphaltene colloids.
Analyzed aggregation processes under varying conditions, including precipitant addition.

Main Results:

Observed diffusion-limited aggregation (DLA) and reaction-limited aggregation (RLA) regimes.
Identified a crossover between DLA and RLA kinetics.
Detected persistent asphaltene colloidal structures in crude oils.
Demonstrated that precipitant addition induces aggregation, with varied responses based on precipitant type and crude oil.

Conclusions:

Asphaltene aggregation exhibits distinct kinetic regimes.
A simple interpolation model for crossover kinetics was proposed.
Crude oil asphaltene aggregation is sensitive to precipitant type, leading to different aggregate morphologies (flocks vs. stable particles).