Contribution of thermal analysis and kinetics of Siberian and Tatarstan regions crude oils for in situ combustion process

This research focused on the characterization and kinetics of Siberian and Tatarstan crude oils by gas chromatography, combustion calorimetry, and thermogravimetry (TG–DTG) techniques. Calorimetric experiments show that crude oil with higher saturate content and low resin fraction has higher heating value. TG–DTG curves indicates that the crude oils undergoes two major transitions when subjected to an oxidizing and constant rate environment known as low- and high-temperature oxidations at each heating rate studied. Kinetic analysis in the low- and high-temperature oxidation regions was performed using model-free methods knows as Ozawa–Flynn–Wall and Kissinger–Akahira–Sunose. Throughout the study, it was observed that the activation energy values of the crude oil samples are varied between 41–72 and 145–198 kJ mol −1 in low- and high-temperature oxidation regions, respectively.