Division of Oxidation Stage of Heavy Oil in the Process of#br#
in-situ Combustion

doi:10.11885/j.issn.1674-5086.2014.09.09.05

Abstract

Abstract:

In-situ combustion is an important replacement method for heavy oil steam stimulation. The division of the reaction
stage of heavy oil oxidation has great influence on the ignition of in-situ combustion and even production. Thermogravimetric（
TG）experiment was conducted to study the oxidation process of a certain heavy oil sample mixed with quartz sand，
and the oxidation process was described in detail by combining the multi-peak shape of thermal weight loss rate curve with
Multi-component oxidation theory of heavy oil，and four stages of weight loss were identified：earlier LTO（low temperature
oxidation），later LTO，fuel deposition and HTO（high temperature oxidation），and the demarcation points were clearly defined.
Compared with the conventional understanding of the three stage oxidation of heavy oil，the four stage method is more capable
of describing the characteristics of low temperature range，long time consuming and complex reaction. The Flynn-Wall-Ozawa
method is used to calculate the activation energy of each stage，which is quite different from that of the conventional division.
The results have reference value for heat supply in ignition period of in-situ combustion of heavy oil reservoir.

Key words: heavy oil, oxidation reaction, TG, activation energy, heating rate

CLC Number:

TE329

JIANG Haiyan1，2*, YUAN Shibao1，2, LI Yang3, NAN Yefei4, WANG Peng5. Division of Oxidation Stage of Heavy Oil in the Process of#br# in-situ Combustion[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.09.09.05.

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Division of Oxidation Stage of Heavy Oil in the Process of#br# in-situ Combustion

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