为认清稠油火驱过程中原油与尾气物理化学性质的变化规律,采用室内三维物理模型开展了稠油火驱实验,并对火驱高温氧化后的原油与尾气开展了饱和烃、芳香烃、烯烃、尾气组分等方面的色谱指纹特征研究。研究表明:稠油火驱后原油物性变好,族组分中饱和烃、芳香烃含量升高;饱和烃色谱指纹图中正构烷烃含量明显增加,轻重比增大;原油中新生成了烯烃化合物,与同碳数饱和烃成对出现且同碳数烯烃与饱和烃比值始终小于0.5;芳香烃色谱指纹图中菲系列化合物发生了明显的甲基转移与脱甲基作用;尾气多维气相色谱图中可见烯烃、氢气、一氧化碳等火驱高温氧化的特征组分。该研究可作为火驱过程中指示燃烧状态的有效技术手段,为稠油火驱燃烧状态的判识提供了支持。
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.
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