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Oxidation behavior of crude oil and SARA fractions

February 6th, 2018

The Rheological and Thermochemical Research Lab is currently engaged in air injection experiments, one of which tackles mechanisms of oxidation reactions of aliphatic and aromatic hydrocarbons. During the last several months, the lab has conducted tests of oxidation of SARA fractions (saturates, aromatics, resins, and asphaltenes) using differential scanning calorimetry, adiabatic calorimetry, and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy.

Project leader Yuan Chengdong says, "The comparison has shown that the oxidation behavior of crude oil and its SARA fractions is very different. We analyzed the difference in oxidation behavior and tried to establish some connections between them. For example, saturated hydrocarbons oxidize well under low temperatures. And asphaltenes, conversely, emit more heat under higher temperatures. It tells us that the oxidation behavior is directly linked to the ratio of SARA fractions in oil. Knowing this ratio, we can choose optimal ways of oil extraction."

The results were partly covered in the study, titled "Oxidation Behavior of Light Crude Oil and Its SARA Fractions Characterized by TG and DSC Techniques: Differences and Connections." The next part of the research is to test light, medium and heavy oils through thermogravimetry. Here, apart from oxidation behavior, main stages and products of in-situ combustion reactions were studied. Light and heavy oils greatly differ during the early stages of oxidation, but their kinetics become much closer during high-temperature oxidation. The findings have been submitted for publication.

"The composition of crude oil is very complex, and the reaction makes it more complicated. But we are trying to solve all the problems. We are scientists. We are born to solve problems. I hope our research will make some contributions to the successful application of air injection techniques (including high pressure air injection and in-situ combustion) in different types of reservoirs," says Yuan.

More information:
Chengdong Yuan et al, Oxidation Behavior of Light Crude Oil and Its SARA Fractions Characterized by TG and DSC Techniques: Differences and Connections, Energy & Fuels (2017). DOI: 10.1021/acs.energyfuels.7b02377

Provided by Kazan Federal University

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