In order to clarify the variation rules of physical and chemical properties of crude oil and tail gas in the process of in-situ combustion of heavy oil, an in-situ combustion experiment on heavy oil was conducted using an indoor three-dimensional physical model, and a study was carried out on the characteristics of chromatographic fingerprint of saturated hydrocarbons, aromatic hydrocarbons, olefins and tail gas components of the crude oil and tail gas after high-temperature oxidation by in-situ combustion. It was found in the study that The physical properties of the crude oil were improved and the contents of saturated hydrocarbons and aromatic hydrocarbons in the group components were increased after in-situ combustion; the content of n-alkanes in the chromatographic fingerprint of saturated hydrocarbons was increased significantly, and the hydrocarbon weight ratio was increased; the crude oil, new olefin compounds were generated in pairs with saturated hydrocarbons with the same carbon number, and the ratio of olefins to saturated hydrocarbons with the same carbon number was always less than 0.5; the phenanthrene series of compounds in the chromatographic fingerprint of aromatic hydrocarbons showed significant methyl transfer and demethylation; the multidimensional gas chromatogram of the exhaust gas showed olefins, hydrogen, carbon monoxide, and other characteristic components of high-temperature oxidation in in-situ combustion. This study provides an effective technical method to indicate the combustion state during the in-situ combustion, and supports the identification of the combustion status of in-situ combustion of crude oil.
Liu Qicheng
,
Yan Hongxing
,
Yang Junyin
,
Yang Pengcheng
,
Zhang Chonggang
. A Method to Identify the Combustion State Based on Characteristics of Chromatographic Fingerprint of Fluid Generated From In-situ Combustion of Heavy Oil[J]. Special Oil & Gas Reservoirs, 2021
, 28(5)
: 140
-145
.
DOI: 10.3969/j.issn.1006-6535.2021.05.020
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