Combustion characteristics and kinetic analysis of heavy oil during in-situ combustion process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Journal / PublicationEnergy Sources, Part A: Recovery, Utilization and Environmental Effects
Online published20 Jul 2021
Publication statusOnline published - 20 Jul 2021

Abstract

In-situ combustion (ISC) technology is a promising method to exploit heavy oil. In this study, 1D tube combustion experiments and the thermogravimetric analysis were combined to investigate the combustion characteristics of the ISC process at the temperature range of 100-600 celcius. First, the temperature intervals of the three combustion stages of the ISC process were determined by thermogravimetric analysis and examined by the 1D tube combustion experiment. Then the activation energies of the three stages were estimated through the Flynn-Wall-Ozawa (FWO) method and the Kissinger-Akahira-Sunose (KAS) method. Results showed that after the ISC reactions, the gravity of the crude oil was upgraded, and the key to maintain the ISC process is keeping the crack reactions continue. The activation energy varies between 66 and 75 kJ/mol in low-temperature oxidation, 197-218 kJ/mol in fuel deposition, and 92-109 kJ/mol in high-temperature oxidation. The different characteristics of the three stages were traced to the occurrence of different reactions, and the high activation energy value of the FD stage was traced to the high proportion of the resins and asphaltenes fractions of the crude oil. Conclusions of this work can help to understand the ISC process better.

Research Area(s)

  • In-situ combustion, heavy oil, activation energy, kas method, fwo method, CRUDE OILS, INSITU COMBUSTION, PYROLYSIS, OXIDATION, MECHANISM

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