Component Transformation Path in the Process of Heavy Oil Fire Flooding Based on Core Analysis

doi:10.3969/j.issn.1006-6535.2024.03.011

Abstract

Abstract: To address the issues of unclear conversion of oil components in in-situ combustion process,the heavy oil reservoir in Hongqian-1 well field of Xinjiang Oilfield was taken as an example:by using infrared spectroscopy and GC-MS method, combined with core analysis results and heavy oil reaction mechanism, the reaction variation of heavy oil components are divided into hydrocarbon oxidation, chemical bond cleavage of heavy oil components and coking formed by aryl radical condensation.The research results are applied to the analysis of the conversion path of heavy oil components.The findings show that the reaction of heavy oil components is the most concentrated in the low temperature stage,which is dominated by condensation and thermal cracking reactions;in the combustion stage,the aryl radical condensation produces coke, and the C-H bond is broken and oxygenated to form oxides such as OH,CHO,and CO;at the high temperature oxidation stage,the coke and heavy components of gum and asphaltene combust.The findings of this study confirm the conclusion that coke combustion induces a rise in temperature and a decrease in viscosity of heavy oil,leading to the transformation of heavy oil components into coke during the fire drive process,thereby enhancing our understanding of the significance of fuel formation and transformation during fire flooding.

Key words: in-situ combustion, heavy oil, oxidation reaction, thermal reaction, transformation path, core analysis

CLC Number:

TE345

Sun Xin′ge, Yang Fengxiang, Li Haibo, Zhan Hongyang, Gao Chengguo, Yuan Shibao. Component Transformation Path in the Process of Heavy Oil Fire Flooding Based on Core Analysis[J]. Special Oil & Gas Reservoirs, 2024, 31(3): 85-90.

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