Solvent assisted oil recovery

E - Fixed Constructions – 21 – B

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E21B 43/22 (2006.01) C09K 8/524 (2006.01) C09K 8/58 (2006.01)

Patent

CA 2721573

The recovery of oil from a reservoir is assisted by injecting a diluent into the reservoir formation to reduce the viscosity of the crude oil. This diluent is a mixture of a material which is an asphaltene precipitant, especially supercritical carbon dioxide, and a more polar material which comprises at least one aliphatic compound which includes at least one of a cycloaliphatic ring, an olefinic unsaturation, an ester or ether group. The inclusion of such an aliphatic compound which is more polar than the asphaltene precipitant reduces asphaltene precipitation and can enhance the efficiency of oil recovery when the precipitant is by supercritical carbon dioxide.

L'invention porte sur la récupération de pétrole à partir d'un réservoir, la récupération étant assistée par l'injection d'un diluant dans la formation de réservoir pour réduire la viscosité du pétrole brut. Ce diluant est un mélange d'une matière qui est un précipitant d'asphaltène, en particulier le dioxyde de carbone supercritique, et d'une matière plus polaire qui comprend au moins un composé aliphatique comportant au moins un noyau cycloaliphatique, une insaturation oléfinique, un groupe ester ou éther. L'inclusion d'un tel composé aliphatique qui est plus polaire que le précipitant d'asphaltène réduit la précipitation d'asphaltène et permet d'augmenter l'efficacité de la récupération de pétrole lorsque le précipitant est le dioxyde de carbone supercritique.

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