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Pyrolysis characteristics and kinetic analysis of oil-based drilling cuttings
Xinying Duan, Hailong Yu, Xulei Wu, Liang Hu, Haiqun Chen, Yunlan Sun and Bo Wu
In this paper, a Thermogravimetric Analyzer was used to study the pyrolysis characteristics and kinetic analysis of oil-based drilling cuttings using thermogravimetric analysis. The pyrolysis characteristics of oil-based drilling cuttings at heating rates of 10 K/min, 20 K/min and 40 K/min, and a final reaction temperature of 1473 K were studied. The four stages of pyrolysis of oil-based drilling cuttings were analyzed. The activation energy of the organic component pyrolysis stage in the pyrolysis process of oil-based drilling cuttings was calculated using two equal conversion methods, Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS), respectively. The mechanism equation of the gasification stage of light components during the pyrolysis of oil-based drilling cuttings at a heating rate of 20 K/min is discussed. The results show that the pyrolysis process of oil-based drilling cuttings can be divided into four stages: drying, light component decomposition (organic decomposition), oil volatile decomposition (organic decomposition), and inorganic decomposition. As the heating rate increases, the TG and DTG curves shift towards the high-temperature side. The apparent activation energy of the volatile phase of the light components calculated using the FWO and KAS methods is 62.9 KJ/mol and 58.6 KJ/mol, respectively. The apparent activation energy of the oil volatile decomposition stage is 173.3 KJ/mol and 168.3 KJ/mol, respectively. It is also found that the activation energy of this stage fluctuates greatly with the increase in conversion, which is a complex multi-step reaction.
Keywords: Oil-based drilling cuttings, Thermogravimetric analysis, Activation energy, Mechanism