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Thermal kinetics study of light oil oxidation using TG/DTG techniques |
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| Authors: | Jihui Ni Hu Jia Wanfen Pu Hang Jiang Jianjun Yang Qiang Ren |
| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University (SWPU), Chengdu, 610500, People’s Republic of China 3. State Key Laboratory of Enhanced Oil Recovery, PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, People’s Republic of China 2. Key Laboratory of Petrophysics & Fluid Flow through Porous Media, PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, People’s Republic of China |
| Abstract: | In this study, the oxidation behavior of crude oils in the presence and absence of rock cuttings was investigated by thermogravimetry/derivative thermogravimetry (TG/DTG) techniques. Prior to these tests, the composition of cuttings and properties of crude oils were analyzed. Three obvious reaction regions were observed from the TG/DTG curves which are recognized as low-temperature oxidation (LTO), fuel deposition (FD), and high-temperature oxidation. The effects of light components (C7–15), heavy fractions (asphaltene, paraffin, resin), and cutting on oil oxidation behavior were analyzed. Kinetic analysis of crude oils and oil + cutting mixtures was performed by Arrhenius method, and the data were analyzed at last. Results show that high content C7–15 hydrocarbons can provide negative effect on the LTO behavior of crude oil. On the contrary, the high content unsaturated heavy hydrocarbons including asphaltene, paraffin, and resin are benefit for the oxidation performance. In addition, a shortened FD stage and higher peak temperature in LTO region are observed by addition of cutting. Cutting especially clay in it plays an active role of catalyzing in oil oxidation reaction. |
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