Comparison of Chromatographic Fingerprint Characteristics of Heavy Oil Based on Fire Flooding Experiments

doi:10.7657/XJPG20210512

Abstract

Abstract:

In fire flooding development of heavy oil, oxidation at high temperature directly affects the evaluation on the development efficiency, and how to identify the combustion state is a technical difficulty. Physical simulation experiments on fire flooding were performed on natural cores, and fingerprint characteristics of saturated hydrocarbon, olefin and aromatic hydrocarbon in heavy oil were analyzed through gas chromatography. The results show that after fire flooding, influenced by oxidation at high temperature, (1) the content of saturated hydrocarbon in the heavy oil increases significantly, the chromatographic fingerprint is a pre-peak unimodal type, both the content of N-alkane and light-heavy ratio (∑nC_21-/∑nC₂₂₊) increase, and no odd-even predominance appears; (2) on the chromatographic fingerprint, the olefins generated from cracking shows that the ratio of olefins to N-alkanes with the same carbon numbers is always less than 1, and the ratio decreases with the increase of the carbon number; (3) the chromatographic fingerprint of aromatic hydrocarbon is a pre-peak type, the content of methylnaphthalene is significantly lower than that of naphthalene in the naphthalenes, so it is easier to have methylation at the α place of the cracked naphthalenes, and the characteristics of the phenanthrenes are similar to those of the naphthalenes. Chromatographic fingerprint can effectively indicate microscopic changes of the heavy oil before and after fire flooding, which lays a foundation for identifying the combustion state of fire flooding.

Key words: heavy oil reservoir, fire flooding, combustion state, oxidation at high temperature, chromatographic fingerprint characteristic, saturated hydrocarbon, olefin, aromatic hydrocarbon

CLC Number:

TE345

YAN Hongxing. Comparison of Chromatographic Fingerprint Characteristics of Heavy Oil Based on Fire Flooding Experiments[J]. Xinjiang Petroleum Geology, 2021, 42(5): 592-597.

Figures/Tables 7

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Table 1

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