Method for recovering and concurrently partly upgrading...

E - Fixed Constructions – 21 – B

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E21B 43/24 (2006.01)

Patent

CA 2208046

An exploratory study of bitumen extraction from samples of oilsands from Alberta's Athabasca oil sands with supercritical water at 400dC and 14-24.5MPa was conducted by the Applicants. Extract yields, which typically ran betwen 80-90% depended mainly on how efficiently the sands were swept by the supercritical water, but were substantially insensitive to sweep rates; and despite the high temperature surprisingly little toluene-insoluble preasphaltic and heavier material was generated. Analyses of the extracts showed significant composition shifts to lower molecular weight moieties, it is concluded that near-critical water can promote a variety of thermally-driven homolytic and/or hydrolytic bond scissons. In the above investigations we observed that conjoint use of such water and carbon monoxide can lead to significant upgrading of the precursor material during recovery. We also found that the addition of a catalyst, such as iron oxide, accelerated the upgrading action.

On a réalisé une étude préliminaire sur l'extraction de bitume d'échantillons de sables bitumineux provenant des sables pétrolifères de l'Athabasca (Alberta), à l'aide d'eau supercritique à 400 .degré.C et 14-24,5 MPa. Les taux d'extraction, qui se situaient typiquement dans la gamme allant de 80 à 90 %, dépendaient principalement de l'efficacité du balayage des sables par l'eau supercritique et restaient pratiquement insensibles à la vitesse de ce balayage. En dépit de la température élevée, la production de matières pré-asphaltiques et de matières plus lourdes, insolubles dans le toluène, était étonnamment faible. Les analyses des extraits ont mis en évidence des déplacements de composition importants vers les composés de poids moléculaires plus faibles. On en a conclu que l'eau proche de son point critique peut favoriser de nombreuses ruptures homolytiques et/ou hydrolytiques de liaisons, causées par effet thermique. Au cours de cette étude, on a observé que l'utilisation simultanée d'eau et de dioxyde de carbone dans un tel état pouvait conduire à une amélioration importante du précurseur au cours de l'extraction. On a aussi trouvé que l'ajout d'un catalyseur, comme de l'oxyde de fer, accélérait ce phénomène d'amélioration.

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